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  스폰서채널 서비스란?
Tutorial: Ethernet OAM
February 23, 2011 | By Cisco
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Transcript
Operations, Administration & Maintenance
F  Fault Management
C  Configuration Management

FCAPS
A  Accounting

P  Performance Management

S  Security Management
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 3
Problem Scope
A few possible scenarios
U-PE A
U-PE B U-PE C
N-PE 3
N-PE 4
N-PE 2
N-PE 1
Customer
Equipment
CE
CE CE
Ethernet UNI
SP Network
PW
Access Core
CE
U-PE D
Ethernet UNI
MPLS
MPLS
SONET/SDH
Native
Ethernet
Physical
link failure
UNI
port failure
U-PE
device failure
Physical
link failure
VFI
failure
Physical
P-Router link failure
failure
PW failure
VLAN to VFI
xconnect failure
Duplex
mismatch
Speed
mismatch
D-LDP session
failure
VC failure
AC
failure
Uni-directional
Link
Excessive
Encoding Errors
Excessive
FCS Errors
Cross-connected
Service
Unexpected
Endpoint
LSP
Failure
C-VLAN
to EVC
mismatch
perations, dministration, aintenance & Provisioning:
fault indication  
performance monitoring
security management  
diagnostic functions
configuration & service provisioning
OAM covers both N S and WE interfaces
Management Plane
(NMS / EMS)
N  
S
Network Plane
(Elements)
W  E
perations, dministration, aintenance & Provisioning:
fault indication  
performance monitoring
security management  
diagnostic functions
configuration & service provisioning
OAM covers both N S and WE interfaces
Management Plane
(NMS / EMS)
N  S
Primary Focus of Ethernet OAM protocols is on W  E interactions
(across NEs)
Network Plane
(NEs)
W  E
Drivers for Ethernet OAM

OAM benchmarks
Set by TDM and existing WAN technologies

Operational Efficiency
Reduce OPEX, avoid truck-rolls
Downtime cost

Management Complexity
Large Span Networks
Multiple constituent networks belong to disparate organizations/
companies
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
Agenda

Protocol Overview
CFM or IEEE 8021ag
ITU Y1731
Link OAM or IEEE 8023ah (clause 57)
MEF E-LMI

OAM Inter-Working

Fault Management scenarios

Performance Management
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
Ethernet OAM Protocol Overview Ethernet OAM Protocol Overview
Presentation_ID ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
Problem Taxonomy
Fault Management
Fault Detection
Fault Notification
Fault Verification
Fault Isolation
Fault Recovery
Configuration Management
Service Provisioning
Performance Management
Frame Loss Measurement
Delay Measurement
Delay Variation Measurement
Availability Measurement
Carrier
Ethernet
Services
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 10
Ethernet OAM
Building Blocks
Fault
Management
Performance
Management
Configuration
Management
Fault
Management
Fault
Management
Performance
Management
Configuration
Management
Performance
Management
Fault
Management
Performance
Management
Configuration
Management Configuration
Management
8023ah
E-LMI
Cisco
IP SLAs 8021ag / Y1731
E-LMI
IEEE 8021ag: Connectivity Fault Management (CFM)
IEEE 8023ah: Ethernet Link OAM (EFM OAM)
ITU-T Y1731: OAM functions and mechanisms for Ethernet based networks
MEF E-LMI: Ethernet Local Management Interface
Cisco IP SLA’s: Performance Management using CFM and Y1731 mechanisms
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 11
Cisco Carrier Ethernet OAM
Protocol Positioning
E-LMIUser to Network Interface (UNI)
Link OAMAny point-point 8023 link
CFMEnd-to-End UNI to UNI
MPLS OAMwithin MPLS cloud
Core Customer
Provider
Bridges
Provider
Bridges
IP/MPLS
Business
Residential
Business
Residential
UNI NNI NNI NNI UNI
Backbone
Bridges
Backbone
Bridges
Customer
Ethernet
Link OAM
Access
Connectivity
EA-LcMceI ss Fault Management
MPLS
OAM
Connectivity
Fault Management
IEEE 8021ag
ConnectivityFault Management
IEEE 8021ag
Presentation_ID ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
CFM Overview

Family of protocols that provides capabilities to detect,
verify, isolate and report end-to-end ethernet
connectivity faults

Employs regular Ethernet frames that travel in-band
with the customer traffic
Devices that cannot interpret CFM Messages forward them as
normal data frames

CFM frames are distinguishable by Ether-Type
(0x8902) and dMAC address (for multicast messages)

Standardized by IEEE in late 2007
IEEE std 8021ag-2007
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
CFM Overview (Cont)

Key CFM mechanisms include:
Nested Maintenance Domains (MDs) that break up
the responsibilities for network administration of a
given end-to-end service
Maintenance Associations (MAs) that monitor
service instances under a given MD
Maintenance Points (MPs) that generate and
respond to CFM PDUs
Protocols (Continuity Check, Loopback and
Linktrace) used for Fault Management activities
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 15
CFM Concepts
Maintenance Domain (MD)
Defined by Operational/Contractual Boundaries
eg Customer/Service Provider/Operator
MD may nest and touch, but never intersect
Up to 8 levels of “nesting”: MD Level (07)
The higher the level, the broader its reach
MD Name Format: null, MAC address, DNS or string-based
Operator A Operator B
Service Provider
Customer
CE CE
Maintenance Domain Nesting
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 17
CFM Concepts
Maintenance Association (MA)
Monitors connectivity of a particular service instance in a given MD
(eg 1 service traversing 4 MDs = 4 MAs)
Defined by a set of Maintenance End Points (MEP) at the edge
of a domain
Identified by MAID == “Short MA” Name + MD Name
Short MA Name Format: Vlan-ID, VPN-ID, integer or string-based
CE Operator A Operator B CE
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 18
CFM Concepts
Maintenance Point (MP)MEP
Maintenance Association End Point (MEP)
Define the boundaries of a MD
Support the detection of connectivity failures between any pair of
MEPs in an MA
Associated per MA and identified by a MEPID (1-8191)
Can initiate and respond to CFM PDU’s (Active Components)
CE Operator A Operator B CE
MEP MEP
MEP MEP
MEP MEP MEP MEP
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 19
CE Operator A Operator B CE
MEP MIP MIP MEP
MEP MIP MIP MEP
MEP MEP MEP MEP
MIP MIP
MIP MIP
MIP MIP
MIP MIP MIP MIP
CFM Concepts
Maintenance Point (MP)MIP
Maintenance Domain Intermediate Point (MIP)
Support the discovery of paths among MEPs and location of faults
along those paths
Can be associated per MD and VLAN / EVC
Can add, check and respond to received CFM PDU’s (Passive)
DOWN MEP to UP MEP
Monitored area
DOWN MEP to DOWN MEP UP MEP to UP MEP
Monitored area Monitored area
CFM Protocols

There are three (3) protocols defined by CFM

Continuity Check Protocol
Fault Detection
Fault Notification

Loopback Protocol
Fault Verification

Linktrace Protocol
Path discovery & Fault Isolation
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 24
CFM Protocols
Continuity Check Protocol
CE Operator A Operator B CE
MEP MIP MIP MEP
Catalogue Catalogue
Catalogue and
Terminate
1 2 3
X1  Continuity Check Message (CCM)
Used for Fault Detection and Notification
Per-Maintenance Association multicast “heart-beat” messages
Transmitted at configurable periodic interval by MEPs (33ms, 10ms, 100ms, 1s, 10s, 1m, 10m)
Uni-directional (no response required)
Carries status of port on which MEP is configured
Catalogued by MIPs at the same MD-Level, Terminated by remote MEPs
in the same MA
Discovery of a remote MEP for the first time CCM MEP UP (New) none
Re-discovery of a previously expired remote MEP
Reception by a MEP of a CCM containing a UP Port
Status TLV or Interface Status TLV (Remote port
recovery)
Reception by a MEP of CCM’s from ALL remote MEPs
configured in a static list
Expiration of CCM entry with an incorrect mpid
Expiration of looped CCM entry
Expiration of CCM entry with an incorrect MAID
Expiration of CCM entry from a MEP not included in a
static list
CCM MEP UP
(Returning)
CCM MEP UP
(portstate change)
Crosscheck Service
Up
CCM MEP Down
(configClear)
CCM MEP Down
(loopClear)
CCM MEP Down
(xconnectClear)
CCM MEP Down
(unknownClear)
none
none
none
none
none
none
none
MEF working on to address this
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 26
CFM Protocols
Loopback Protocol
CE Operator A Operator B CE
MEP MIP MIP MEP
S D
1 Loopback Message (LBM)
2 Loopback Reply (LBR)
1
2
1
2
Used for Fault VerificationEthernet Ping
MEP can transmit a unicast LBM to a MEP or MIP in the same MA
Receiving MP responds by transforming the LBM into a unicast
LBR sent back to the originating MEP
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 27
CFM Protocols
Linktrace Protocol
Used for Path Discovery and Fault IsolationEthernet Traceroute
MEP can transmit a multicast message (LTM) in order to discover
the MPs and path to a MIP or MEP in the same MA
Each MIP along the path and the terminating MP return a unicast
LTR to originating MEP
CE Operator A Operator B CE
MEP MIP MIP MEP
S D
1 3 5
2
4 6
1 1, 3, 5 Linktrace Message (LTM)
2 2, 4, 6 Linktrace Reply (LTR)
X
Y
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 28
Connectivity Fault Management
Troubleshooting Example
CE 1
MPLS
Access MPLS Core Ethernet
Access
uPE B nPE B nPE A uPE A CE 2
Customer Service Provider
PE-Agg B
Service Provider
Domain
Operator
Domains
Customer
Domain
!
Defect Locality Zone
Loopback &
Link Trace Tests
‘Uncertainty’ Zone
shrinks with every
lower level Domain
Defect successfully
isolated
CFM Protocols
Putting Everything Together
1
Run Connectivity Check to proactively detect a
soft or hard failure
2
Upon a failure detection, use Loopback to verify it
3
Upon verification, run Traceroute to isolate it;
multiple segment LPs can also be used to isolate
the fault
4
If the isolated fault points to a virtual circuit, then
the OAM tools for that technology can be used to
further fault isolationeg, for MPLS PW, VCCV
and MPLS ping can be used
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
ITU-T Y1731 ITU-T Y1731
Presentation_ID ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
ITU-T Y1731 Overview

ITU-T recommendation that provides mechanisms for
user-plane OAM functionality in Ethernet networks
Covers:
Fault Management mechanisms
Performance Management mechanisms

Standardized by ITU-T SG 13 in May 2006
Latest published version dated Feb 2008 after IEEE 8021ag
standardization

Frames format (Multicast Address, Ethertype, and
common OAM PDU fields) and base functionality are
mostly agreed across IEEE 8021ag and Y1731
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
ITU-T Y1731 Overview
OAM Functions for Fault Management
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 32
Feature ITU-T Y
1731
IEEE
CFM Comments
Ethernet ContinuityCheck ETH-CC CC
Proactive fault detection, fault notification
Not compatible Different formats for short MA / MEG ID
IEEE defines mcast DA CCM, ITU defines mcast/ucast DACCM
Ethernet Loopback ETH-LB LB
On-demand service / fault verification
Compatible operations between IEEE and ITU
IEEE defines ucast DA LBM, ITU defines mcast/ucast DALBM
Ethernet Link Trace ETH-LT LT
On-demand path discovery / fault isolation
Compatible operations between IEEE and ITU
Ethernet Remote
Defect Indication ETH-RDI RDI
Fault propagation in the backward direction (opposite
direction of the fault)
IEEE RDI flag and Y1731 ETH-RDI are in the same
position in CCM header However, CCM formats are not
compatible
Ethernet Alarm
Indication Signal ETH-AIS --
Fault propagation in the forward direction (same direction of
the fault)
Also used to suppress Loss of Continuity alarms following
detection of defect conditions
ITU-T Y1731 Overview
OAM Functions for Fault Management
Feature ITU-T Y
1731
IEEE
CFM Comments
Ethernet Locked
Signal ETH-LCK --
Communicates administrative locking of a MEP
Allows intrusive OAM loopback tests (eg during turn up)
Ethernet Test Signal ETH-Test --One-way on-demand diagnostics
Ethernet Automatic
Protection Switching ETH-APS --Applications defined in ITU-T G8031 and G8032 (Ethernet
Linear and Ring Protection Switching)
Ethernet Maintenance
Communication
Channel
ETH-MCC --No application / use defined in Y1731
Ethernet
Experimental OAM ETH-EXP --No application / use defined in Y1731
Ethernet Vendor-
specific OAM ETH-VSP --No application / use defined in Y1731
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
Link OAM
IEEE 8023ah (Clause 57)
Link OAM
IEEE 8023ah (Clause 57)
Presentation_ID ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 35
Link OAM (IEEE 8023ah, Clause 57)
Provides mechanisms useful
for “monitoring link operation”,
such as:
Link Monitoring
Remote Failure Indication
Remote Loopback Control
Defines an optional OAM sublayer
Intended for single point-to-point
IEEE 8023 links
Uses “Slow Protocol”(1) frames
called OAMPDUs which are never
forwarded by MAC clients
Standardized: IEEE 8023ah, clause
57 (now in IEEE 8023-2005)
Higher Layers
LLC
OAM (Optional)
MAC
Physical Layer
LAN
CSMA/CD
Layers
(1) No more than 10 frames transmitted in any one-second period
OSI Model
Application
Presentation
Session
Transport
Network
Data Link
Physical
IEEE 8023ah
Key Functions

OAM discovery
Discover OAM support and capabilities per device

Link monitoring
basic error definitions for Ethernet so entities can detect failed and
degraded connections

Fault signaling
mechanisms for one entity to signal another that it has detected an error

Remote MIB Variable Retrieval
Ability to read one/more remote MIB variables from remote DTE

Remote loopback
used to troubleshoot networks, allows one station to put the other
station into a state whereby all inbound traffic is immediately reflected
back onto the link
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 37
IEEE 8023ah
Remote Loopback
Fault localization and link performance testing
Loopback Control OAMPDU is used to control a remote
OAM client
Traffic sent from master loopback port is loopback by
slave port, except Pause and OAMPDU
OAM
MAC
PHY
OAM
MAC
PHY
X
X
Master OAM Slave OAM
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 38
Ethernet Data-Plane Loopback
(Proprietary today)
Ethernet data traffic can be looped back
on a per port / per VLAN basis
Use cases:
Service turn-up
Post service turn-up troubleshooting
Out-of-service throughput testing
Enabled via CLI configuration
Configurable SRC and DST MAC
Addresses swap
Configurable direction:
Facility Loopback (facing cloud)
Terminal Loopback (facing bridge)
Central Test Head allows for flexible
and sophisticated test traffic patterns
Complements CFM Loopback
Available in Cisco ME-3400E
UNI Customer
CPE
Central
Test Head
ME 3400E
Carrier
Ethernet
Network
NNI
Facility Loopback
Terminal
Loopback
Ethernet Local
Management Interface
MEF-16
Ethernet Local
Management Interface
MEF-16
Presentation_ID ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
Overview
Provides protocol and mechanisms
used for:
Notification of EVC addition, deletion or
status (Active, Not Active, Partially Active)
to CE User Network Interface
Communication of UNI and EVC attributes (UNI)
to CE (eg CE-VLAN to EVC map)
UNI-C
Cisco Metro
Enhancement CE auto-configuration
Ethernet
Notification of Remote UNI name and Network
status to CE CE
Asymmetric protocol based on
E-LMI
Frame Relay LMI, mainly applicable
to the UNI (UNI-C and UNI-N)
Specification completed by MEF:
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 41
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
ELMI Status Enquiry message (Full Status report)
ELMI Status message (Full Status report)
Local UNI ID CE11_UNI
CE-VLAN/EVC Map type Service_Multiplexing
EVC ID EVC_P2P_100
EVC Type Point_to_Point
CE-VLAN/EVC Map vlan 100
EVC Status New, Active
Remote UNI count  configured 1
Remote UNI count  active 1
Remote UNI ID CE31_UNI
Remote UNI status UP
Example:
CE Notification
CE 11 uPE 11 AGG 11 AGG 31 uPE 31 CE 31
Cisco enhancements
to MEF ELMI
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 42
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
CE Notification
CE 11 uPE 11 AGG 11 AGG 31 uPE 31 CE 31
CE11#show ethernet lmi evc detail EVC_P2P_100
EVC Id: EVC_P2P_100
interface GigabitEthernet0/0
Time since Last Full Report: 00:21:23
Ether LMI Link Status: Up
UNI Status: Up
UNI Id: CE11_UNI
CE-VLAN/EVC Map Type: Bundling
VLAN: 100
EVC Status: Active
EVC Type: Point-to-Point
Remote UNI Count: Configured = 1, Active = 1
UNI Id UNI Status Port
------ ---------- ----
CE31_UNI Up Remote
CE11#show ethernet lmi evc detail EVC_MP_250
EVC Id: EVC_MP_250
interface GigabitEthernet0/0
Time since Last Full Report: 00:25:54
Ether LMI Link Status: Up
UNI Status: Up
UNI Id: CE11_UNI
CE-VLAN/EVC Map Type: Bundling
VLAN: 250
EVC Status: Active
EVC Type: Multipoint-to-Multipoint
Remote UNI Count: Configured = 2, Active = 2
UNI Id UNI Status Port
------ ---------- ----
CE12_UNI Up Remote
CE31_UNI Up Remote
CE11#show ethernet lmi evc map interface gig0/0
UNI Id: CE11_UNI
St Evc Id CE-VLAN
--- ----------------- --------
A EVC_MP_250 250
A EVC_P2P_100 100
Key: St=Status, A=Active, P=Partially Active,
I=Inactive,
*=Default EVC, ?=Link Down
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 43
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
CE NotificationVLAN ID Missmatch
CE 11 uPE 11 AGG 11 AGG 31 uPE 31 CE 31
CE Configured with the incorrect C-VLAN (eg vid 1300)
CE11(config)#interface gig0/0100
CE11(config-subif)#encapsulation dot1Q 1300
Jan 26 00:15:39546: %ETHER_LMI-6-MISMATCHED_VLAN_NOT_CONFIGURED: VLAN 100 not
Configured but in VLAN mapping for UNI GigabitEthernet0/0
Jan 26 00:15:39546: %ETHER_LMI-6-MISMATCHED_VLAN_CONFIGURED: VLAN 1300 configured
but not in VLAN mapping for UNI GigabitEthernet0/0 Interface
CE11#show ip interface brief
Interface IP-Address OK? Method Status Protocol
<snip>
GigabitEthernet0/0100 10010010011 YES NVRAM down down
Proactive ELMI Action
at CPE
Ethernet OAM
Interworking
Ethernet OAM
Interworking
Presentation_ID ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 45
Ethernet
over SONET Ethernet
over MPLS 10G
Ethernet ATM
RFC1483
Edge Bridge
Bridge
Bridge
Bridge
Edge Router
switch
switch
Router
Router
Router
ATM Switch
ATM Switch
Operator A Operator B
Network
OAM Network
OAM
Customer
Bridge
Customer
Bridge
Transport
OAM
Transport
OAM
Transport
OAM
Transport
OAM
Server Layers feed
events into Client Layers
Event Translation interdomains
intra-layer
Service OAM
What Is OAM Interworking?
Strict OAM layering should be honored: messages should not cross layers
OAM Messages should not leak outside domain boundaries within a layer
Interworking is event translations & not necessarily 1:1 message mapping
Interworking may be inter-layer and intra-layer
Interworking Scenarios
CFM E-LMI
Link OAM CFM
MPLS PW OAM E-LMI
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
Fault ManagementScenarios
Fault ManagementScenarios
Presentation_ID ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
High Level Topology
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 48
Fault Management Scenarios
Number Description
1 End-to-End Service/Path Verification
Fault Verification/Isolation
2 Using E-OAM for Ethernet Access to L3VPN
3 E2E CPE Fault Notification & CPE Corrective Action
using Ethernet OAM Interworking
4 Ethernet OAM and MPLS OAM Interworking
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 50
Operational Scenario 1
Problem Statement
Fault Verification and Fault Isolation of ethernet connectivity issues
Problem Solution
IEEE 8021ag (CFM) Ping and Traceroute utilities for reactive
troubleshooting of service connectivity issues
Ethernet
Access
MPLS
Aggregation Ethernet
Access
Customer Service Provider
Customer
Domain
Service Provider
Domain
Operator Domain
CE 11 uPE 11 PE-Agg nPE 11 nPE 31 uPE 31 CE 31
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 51
Operational Scenario 1 (cont)
Problem Statement
Fault Verification and Fault Isolation of ethernet connectivity issues
Problem Solution
IEEE 8021ag (CFM) Ping and Traceroute utilities for reactive
troubleshooting of service connectivity issues
Ethernet
Access
Ethernet MPLS Core
Access
Customer Service Provider
Customer
Domain
Service Provider
Domain
Operator Domain
CE 11 uPE 11 PE-Agg nPE 11 nPE 31 uPE 31 CE 31
uPE11#ping ethernet mpid 3100 level 4 vlan 100
Type escape sequence to abort
Sending 5 Ethernet CFM loopback messages, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
uPE11 uPE31
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 52
Operational Scenario 1 (cont)
Problem Statement
Fault Verification and Fault Isolation of ethernet connectivity issues
Problem Solution
IEEE 8021ag (CFM) Ping and Traceroute utilities for reactive
troubleshooting of service connectivity issues
Ethernet
Access
Ethernet MPLS Core
Access
Customer Service Provider
Customer
Domain
Service Provider
Domain
Operator Domain
CE 11 uPE 11 PE-Agg nPE 11 nPE 31 uPE 31 CE 31
uPE11#traceroute ethernet 0012017c3d00 level 4 vlan 100
Type escape sequence to abort TTL 255 Per-Hop Timeout is 10 seconds
Tracing the route to 0012017c3d00 on Domain PROVIDER_DOMAIN, Level 4, vlan 100
Traceroute sent via GigabitEthernet0/16
--------------------------------------------------------------------------------
MAC Ingress Ingress Action Relay Action
Hops Host Forwarded Egress Egress Action Next Hop
--------------------------------------------------------------------------------
B 1 nPE11 00135f21cec5 Gi3/1 IngOk RlyCCDB
Forwarded
B 2 nPE31 000785083485 RlyFDB
Forwarded Gi3/1 EgrOK uPE31
! 3 uPE31 0012017c3d00 Gi1/1/1 IngOk RlyNone
Not Forwarded
uPE11 nPE11 nPE31 uPE31
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 53
Operational Scenario 1 (cont)
Problem Statement
Fault Verification and Fault Isolation of ethernet connectivity issues
Problem Solution
IEEE 8021ag (CFM) Ping and Traceroute utilities for reactive
troubleshooting of service connectivity issues
Ethernet
Access
Ethernet MPLS Core
Access
Customer Service Provider
Customer
Domain
Service Provider
Domain
Operator Domain
CE 11 uPE 11 PE-Agg nPE 11 nPE 31 uPE 31 CE 31
Jan 26 03:14:10608: %ETHER_SERVICE-6-EVC_STATUS_CHANGED: status of EVC_P2P_100
changed to InActive
uPE11#traceroute ethernet 0012017c3d00 level 4 vlan 100
Type escape sequence to abort TTL 255 Per-Hop Timeout is 10 seconds
Tracing the route to 0012017c3d00 on Domain PROVIDER_DOMAIN, Level 4, vlan 100
Traceroute sent via GigabitEthernet0/16
--------------------------------------------------------------------------------
MAC Ingress Ingress Action Relay Action
Hops Host Forwarded Egress Egress Action Next Hop
--------------------------------------------------------------------------------
B 1 nPE11 00135f21cec5 Gi3/1 IngOk RlyCCDB
Forwarded
B 2 nPE31 000785083485 RlyCCDB
Not Forwarded Gi3/1 EgrDown
nPE31(config)#int gig3/1
nPE31(config-if)#shutdown
X
Proactive
Fault Notification
Reactive
Fault Isolation
uPE11 nPE11 nPE31 uPE31
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 54
Operational Scenario 2
Problem Statement
Troubleshooting Ethernet access connectivity problems by L3VPN PE
Problem Solution
IEEE 8021ag CFM with Outward-facing / Down MEPs at L3VPN PE
MPLS
Aggregation
Ethernet
Access
Customer Service Provider
Customer
Domain
Service Provider
Domain
Operator Domain
CE 11 uPE 11 PE-Agg nPE 11 nPE 21 L3VPN PE
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 55
Operational Scenario 2 (cont)
Problem Statement
Troubleshooting Ethernet access connectivity problems by L3VPN PE
Problem Solution
IEEE 8021ag CFM with Outward-facing / Down MEPs at L3VPN PE
Ethernet
Access
Ethernet MPLS Core
Access
Customer Service Provider
Customer
Domain
Service Provider
Domain
Operator Domain
CE 11 uPE 11 PE-Agg nPE 11 nPE 21 uPE 21 L3VPN PE
L3VPN-PE#show running-config | begin GigabitEthernet3/0/0
interface GigabitEthernet3/0/0
description L3VPN PE to nPE21 gig3/3
ethernet cfm mep level 4 outward domain PROVIDER_DOMAIN mpid 2450 vlan 450
ethernet cfm mep level 4 outward domain PROVIDER_DOMAIN mpid 2350 vlan 350
!
interface GigabitEthernet3/0/0350
description To CE31
encapsulation dot1Q 350
ip vrf forwarding BLUE
ip address 1111 2552552550
!
interface GigabitEthernet3/0/0450
description To CE21
encapsulation dot1Q 450
ip vrf forwarding RED
ip address 1111 2552552550
L3VPN-PE#show ethernet cfm maintenance-points remote
Can only Ping/Traceroute to remote MEPs marked with *
MPID Level Mac Address Vlan PortState InGressPort Age(sec) Service ID
3350* 4 0012017c3d00 350 UP Gi3/0/0350 20 customer_350_provider
2451* 4 0019552c0b80 450 UP Gi3/0/0450 23 customer_450_provider
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 56
Operational Scenario 3
Problem Statement
End to End Fault Notification of service status to Customer Equipment
Problem Solution
IEEE 8023ah to IEEE 8021ag (CFM) Inter-Working (IW) for
propagation of EVC status and CFM to E-LMI IW for notification to CE
Ethernet
Access
MPLS
Aggregation
Ethernet
Access
Customer Service Provider
Customer
Domain
Service Provider
Domain
Operator Domain
CE 11 uPE 11 PE-Agg nPE 11 nPE 31 uPE 31 CE 31
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 57
Operational Scenario 3 (cont)
Problem Statement
End to End Fault Notification of service status to Customer Equipment
Problem Solution
IEEE 8023ah to IEEE 8021ag (CFM) Inter-Working (IW) for
propagation of EVC status and CFM to E-LMI IW for notification to CE
Ethernet
Access
Ethernet MPLS Core
Access
Customer Service Provider
Customer
Domain
Service Provider
Domain
Operator Domain
CE 11 uPE 11 PE-Agg nPE 11 nPE 31 uPE 31 CE 31
4 3 2 1
E-LMI CFM
Link OAM
E-LMI
Link OAM
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 58
Operational Scenario 3 (cont)
Problem Statement
End to End Fault Notification of service status to Customer Equipment
Problem Solution
IEEE 8023ah to IEEE 8021ag (CFM) Inter-Working (IW) for
propagation of EVC status and CFM to E-LMI IW for notification to CE
Ethernet
Access
Ethernet MPLS Core
Access
Customer Service Provider
Customer
Domain
Service Provider
Domain
Operator Domain
CE 11 uPE 11 PE-Agg nPE 11 nPE 31 uPE 31 CE 31 CE31(config)#int fast 0/0
CE31(config-if)#shutdown
Jan 26 03:40:08176: %ETHERNET_OAM-6-EXIT_SESSION: The client on interface Fa0/0
has left the OAM session
Jan 26 03:40:10180: %LINK-5-CHANGED: Interface FastEthernet0/0, changed state to
administratively down
Jan 26 03:40:11180: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0,
changed state to down
X
4 3 2 1
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 59
Operational Scenario 3 (cont)
Problem Statement
End to End Fault Notification of service status to Customer Equipment
Problem Solution
IEEE 8023ah to IEEE 8021ag (CFM) Inter-Working (IW) for
propagation of EVC status and CFM to E-LMI IW for notification to CE
Ethernet
Access
Ethernet MPLS Core
Access
Customer Service Provider
Customer
Domain
Service Provider
Domain
Operator Domain
CE 11 uPE 11 PE-Agg nPE 11 nPE 31 uPE 31 CE 31
Jan 26 03:40:08176: %ETHERNET_OAM-6-RFI: The client on interface Fa1/0/1 has received a remote failure
Indication from its remote peer (failure reason = remote client administratively turned off)
Jan 26 03:40:08184: %ETHER_SERVICE-6-EVC_STATUS_CHANGED: status of EVC_P2P_100 changed to InActive
Jan 26 03:40:09191: %ETHERNET_OAM-6-EXIT_SESSION: The client on interface Fa1/0/1 has left the OAM session
uPE31#show ethernet service evc
Identifier Type Act-UNI-cnt Status
EVC_P2P_100 P-P 1 InActive
uPE31#show ethernet lmi evc
UNI Id: CE31_UNI
St Evc Id CE-VLAN
--- ---------------------------------------- ----------------------------------
?I EVC_P2P_100 100
Key: St=Status, A=Active, P=Partially Active, I=Inactive, *=Default EVC, ?=Link Down
4 3 2 1
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 60
Operational Scenario 3 (cont)
Problem Statement
End to End Fault Notification of service status to Customer Equipment
Problem Solution
IEEE 8023ah to IEEE 8021ag (CFM) Inter-Working (IW) for
propagation of EVC status and CFM to E-LMI IW for notification to CE
Ethernet
Access
Ethernet MPLS Core
Access
Customer Service Provider
Customer
Domain
Service Provider
Domain
Operator Domain
CE 11 uPE 11 PE-Agg nPE 11 nPE 31 uPE 31 CE 31
4 3 2 1
Jan 26 03:40:36093: %ETHER_SERVICE-6-EVC_STATUS_CHANGED: status of EVC_P2P_100 changed to InActive
uPE11#show ethernet cfm maintenance-point remote
MPID Level Mac Address Vlan PortState InGressPort Age(sec) Service ID
3100 4 0012017c3d00 100 DOWN Gi0/16 21 customer_100_provider
uPE11#show ethernet service evc
Identifier Type Act-UNI-cnt Status
EVC_P2P_100 P-P 1 InActive
uPE11#show ethernet lmi evc
UNI Id: CE11_UNI
St Evc Id CE-VLAN
--- ---------------------------------------- ----------------------------------
I EVC_P2P_100 100
Key: St=Status, A=Active, P=Partially Active, I=Inactive, *=Default EVC, ?=Link Down
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 61
Operational Scenario 3 (cont)
Problem Statement
End to End Fault Notification of service status to Customer Equipment
Problem Solution
IEEE 8023ah to IEEE 8021ag (CFM) Inter-Working (IW) for
propagation of EVC status and CFM to E-LMI IW for notification to CE
Ethernet
Access
Ethernet MPLS Core
Access
Customer Service Provider
Customer
Domain
Service Provider
Domain
Operator Domain
CE 11 uPE 11 PE-Agg nPE 11 nPE 31 uPE 31 CE 31
4 3 2 1
CE11#show ethernet lmi evc
UNI Id: CE11_UNI
St Evc Id CE-VLAN
--- ---------------------------------------- ----------------------------------
I EVC_P2P_100 100
Key: St=Status, A=Active, P=Partially Active, I=Inactive, *=Default EVC, ?=Link Down
CE11#show ip interface brief
Interface IP-Address OK? Method Status Protocol
<snip>
GigabitEthernet0/0100 10010010011 YES manual down down
Proactive E2E
Fault Notification
Proactive CPE
Action
Operational Scenario 4
Ethernet and MPLS OAM

Problem Statement
Troubleshooting Ethernet services over MPLS

Problem Solution
CFM for detection, CFM and MPLS OAM for verification and
isolation
EoMPLS Pseudowire
MEP
MIP
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
Received SNMPv2c Trap:
Community: TEST
From: 127001
sysUpTimeInstance = 668615
snmpTrapOID0 =
cEtherCfmEvent 1340 =
cEtherCfmEventLclMacAddress1340 = 00 19 30 c0 bb 00
cEtherCfmEventLclMepCount1340 = 1
cEtherCfmEventLclIfCount1340 = 1
cEtherCfmEvent 1340 =
cEtherCfmEvent 1340 =
EoMPLS Pseudowire
cEtherCfmEvent 1340 =
ME3400G-2CS-1#
Level Vlan MPID Remote MAC Reason Service ID
Operational Scenario 4 …Cont
Ethernet and MPLS OAM
ME3400G-2CS-1#
Type escape sequence to abort
Sending 5 Ethernet CFM loopback messages, timeout is 2 seconds:
ME3400G-2CS-1#traceroute ethernet 001930c0ad80 level 5 vlan 100
Type escape sequence to abort TTL 255 Per-Hop Timeout is 10 seconds
Tracing the route to 001930c0ad80 on Domain TEST-jose, Level 5, vlan 100
Traceroute sent via GigabitEthernet0/3
-
MAC Ingress Ingress Action Relay Action
Hops Host Forwarded Egress Egress Action Next Hop
-
B 1 ME3400G-1 0019552bdf00 Gi0/3 IngOk RlyFDB
Forwarded Gi0/14 EgrOK 7604-1
B 2 7604-1 00169c6e7985 Gi2/0/2 IngOk RlyCCDB
Forwarded
*
*
*
MPLS OAM Summary
Testing the Pseudo-Wire
R1#ping mpls pseudowire <IPv4 peer addr> <VC ID>
Testing the Transport LSP
R3#ping mpls ipv4 <IPv4 peer adr>
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
Ethernet Performance
Management
Ethernet Performance
Management
Presentation_ID ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
ITU-T Y1731 Overview
OAM Functions for Performance Management

ITU-T Y1731 defines the PM functions and protocols tocollect the performance data

Frame Loss Measurement (ETH-LM)
Based on in-profile service frame counters (for P2P services only)
Dual-ended ETH-LM (using CCM PDU)
Single-ended ETH-LM (using LMM and LMR PDUs)

Frame Delay Measurement (ETH-DM)
One-way ETH-DM (using 1DM PDU)
Two-way ETH-DM (using DMM and DMR PDUs)

Synthetic Frame Loss Measurement (ETH-SLM)
Proposal under discussion at ITU-T
Covers P2P and MP services using synthetic traffic frame loss
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 69
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
IP SLA Ethernet “ECHO” probe
Round Trip Time
IP SLA Ethernet “JITTER” probe
One-way Delay
One-Way Delay Variation
One-way Packet Loss
End-to-end service performance management
CE 11 uPE 11 AGG 11 AGG 31 uPE 31 CE 31
CFM LBM (with timestamps)
CFM LBR (with timestamps)
Vendor-specific CFM PDUs
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 70
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
End-to-end service performance management
ip sla ethernet-monitor 1
type echo domain PROVIDER_DOMAIN vlan 100
tag Dynamic-Echo-vid-100
owner Jose Liste
ip sla ethernet-monitor schedule 1 scheduleperiod
90 frequency 30 start-time now
ip sla ethernet-monitor 2
type jitter domain PROVIDER_DOMAIN vlan 100
num-frames 20 interval 10
tag Dynamic-Jitter-vid-100
owner Jose Liste
ip sla ethernet-monitor schedule 2 scheduleperiod
90 frequency 30 start-time now
Jitter Probe parameters:
Vlan ID
MEP ID (optional)
Frequency
Number of packets
Inter-packet gap
Echo Probe parameters:
Vlan ID
MEP ID (optional)
Frequency
Time
Time
CE 11 uPE 11 AGG 11 AGG 31 uPE 31 CE 31
Summary Summary
Presentation_ID ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
Summary

Ethernet OAM deliver equivalent function sets of legacy
OAM and more to drive effective operations

You can perform fault, performance and configuration
management with E-OAM

There are multiple suites of protocols from various
standard bodies (& vendors) that work in different
bucket

And they do interwork to give you a comprehensive
troubleshooting and maintenance platform
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
Questions?
Acknowledgement

Jose Liste, Technical Marketing Engineer at Cisco
Systems
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
Acronyms
Acronym
AIS Alarm Indication Signal
Continuity Check Message
CCM Data Base (see CCM)
Customer Edge
Connectivity Fault Management
Ethernet in the First Mile
Ethernet LMI (see LMI)
Ethernet OAM (see OAM)
Ethernet Virtual Connection
Institute of Electrical and Electronics
Engineers
International Telecommunication Union
Loopback Message
Loopback Reply
Local Management Interface
Linktrace Message
Linktrace Reply
Maintenance Association
MA Identifier (see MA)
Maintenance Domain
CCM
CCMDB
CE
CFM
EFM
E-LMI
E-OAM
EVC
IEEE
ITU
LBM
LBR
LMI
LTM
LTR
MA
MAID
MD
Acronym
MEF Metro Ethernet Forum
Metro Ethernet Network
Maintenance Association End Point
MEP Identifier (see MEP)
MIP Half Function (see MIP)
Management Information Base
Maintenance Domain Intermediate Point
Maintenance Point
Operations, Administration and
Maintenance
Protocol Data Unit
Provide Edge
Remote Defect Indicator
Remote Failure Indicator
Type, Length, Value
User to Network Interface
Customer side of UNI (see UNI)
Network side of UNI (see UNI)
VLAN Identifier
Virtual LAN
MEN
MEP
MEPID
MHF
MIB
MIP
MP
OAM
PDU
PE
RDI
RFI
TLV
UNI
UNI-C
UNI-N
VID
VLAN
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
Ethernet OAM

IEEE 8021ag
Connectivity Fault Management (CFM)
Also referred as Service OAM

IEEE 8023ah (clause 57)
Ethernet Link OAM
Also referred as 8023 OAM, Link OAM or Ethernet in the First
Mile (EFM) OAM

ITU-T Y1731
OAM functions and mechanisms for Ethernet-based networks

MEF E-LMI
Ethernet Local Management Interface
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
IEEE 8023ah
OAM Events

Set of events that may impact link operation

Critical Link events
Link faultFault in the Rx direction of local DTE
Dying gaspUnrecoverable local failure condition
Critical eventUnspecified critical event

Link events
Errored Symbol Period Event
Errored Frame Event
Errored Frame Period Event
Errored Frame Seconds Summary Event
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
A
C
STATUS (EVC ASYNC Status)
E
T391 Expiry
B
D
Restart T391
E
MEN Update
Restart T392
N391 polls sent
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 80
MEP MIP MIP MEP
LMM
Customer
Equipment
Customer
Equipment
Operator A
Bridges
Operator B
Bridges
ITU-T Y1731 Overview
Single-Ended (On-demand) ETH-LM
LMR
LMM  Loss Measurement Message
LMR  Loss Measurement Reply
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 81
MEP MIP MIP MEP
DMM
Customer
Equipment
Customer
Equipment
Operator A
Bridges
Operator B
Bridges
ITU-T Y1731 Overview
Two-Way ETH-DM
DMR
DMM  Delay Measurement Message
DMR  Delay Measurement Reply
RxTimestampf
Frame Delay = TxTimestampb
(RxTimeb  TxTimesampf)  
(TxTimestampb  RxTimesampf)
TxTimestamp
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 82
Interworking Scenarios
CFM to E-LMI
CFM @ Provider Level acts as MEN OAM: provides EVC Status
and Remote UNI Status/Name to E-LMI
Interface Status TLV of CC Messages carry remote UNI status
Cisco’s Organization-specific TLV of CC Messages carry remote UNI name
Status of remote MEP in CCDB indicates EVC State
CE 11
CE
Ethernet
Access
MPLS
Aggregation
Ethernet
Access
Service Layer
OAM
Network Layer
OAM
E-LMI
uPE 11 nPE 11 nPE 31 uPE 31 CE 31
Provider Level CFM
CFM to E-LMI I/W
Customer Service Provider
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 83
Interworking Scenarios
8023ah to CFM (CC-based)
Link Layer Defects detected by 8023ah, relayed to CFM on same device
CFM notifies remote devices of localized fault
Two variants:
CC based (8023ah on edge of domain)
AIS based (8023ah within domain)
CE 1
Ethernet
Access
Ethernet MPLS Aggregation
Access
uPE 11 nPE 11 nPE 31 uPE 31 CE 31
Customer Service Provider
PE-Agg
Service
Layer OAM
Transport
Layer OAM
CC
8023ah to CFM I/W 8023ah
CE
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 84
Interworking Scenarios
8023ah to CFM (AIS-based)
CE 1
Ethernet
Access
Ethernet MPLS Aggregation
Access
uPE 11 nPE 11 nPE 31 uPE 31 CE 31
Customer Service Provider
PE-Agg
Service
Layer OAM
Transport
Layer OAM
AIS AIS
8023ah 8023ah to CFM I/W
CE
Link Layer Defects detected by 8023ah, relayed to CFM on same device
CFM notifies remote devices of localized fault
Two variants:
CC based (8023ah on edge of domain)
AIS based (8023ah within domain)
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 85
Interworking Scenarios
MPLS PW OAM to E-LMI
Directed-LDP & VCCV (BFD mode) running between PEs
D-LDP for defect notification, VCCV for defect detection
Defects detected/communicated by PW OAM are relayed to E-LMI via I/W
function on PE
CE 1
CE
MPLS Core
Service Layer
OAM
Transport
Layer OAM
PE B PE A CE 2
Customer Service Provider
VCCV-BFD
D-LDP
E-LMI E-LMI
PW OAM to
E-LMI I/W
Customer
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 86
CFM Deployment
Scenario A
CE1 Access 1 Aggregation 1 Aggregation 2 Access 2 CE2
Admin Domain “A”
End to End service provided over a single
Administrative Domain (eg Carrier A)
Ethernet
Aggregation
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 87
CFM Deployment
Scenario A (Cont)
Customer
Domain
SP
Domain
Link
Domain
MEP MIP
CE1 Access 1 Aggregation 1 Aggregation 2 Access 2 CE2
Ethernet
Aggregation
Port MEPs
First mile link monitoring
End to End SP service monitoring
End to End Customer service monitoring
(optional)
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 88
CFM Deployment
Scenario B
Admin Domain “A” Admin Domain “B”
CE1 Access 1 Aggregation 1 Aggregation 2 Access 2 CE2
End to End service provided by a SP (eg Carrier A)
who relies on another SP access network
(eg Carrier B) to reach some customer sites
Ethernet
Aggregation
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 89
CFM Deployment
Scenario B (Cont)
Customer
Domain
Operator
Domain
MEP MIP
CE1 Access 1 Aggregation 1 Aggregation 2 Access 2 CE2
Ethernet
Aggregation
Port MEPs
E-NNI link monitoring
Independent Operator service monitoring
End to End Customer service monitoring
(optional)
Link
Domain
Fault Management Scenarios Fault Management Scenarios
Presentation_ID ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 91
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
CE Access Aggregation Aggregation Access CE
Point-to-Point Ethernet Service
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 92
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
CE Access Aggregation Aggregation Access CE
E-LMI CFM
Link OAM E-LMI
Link OAM
OAM protocol positioning
CFM
to E-LMI IW
CFM
to E-LMI IW
Link OAM
to CFM IW
Link OAM
to CFM IW
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 93
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
CFM Continuity Check Messages (CCM)
UPE11#show ethernet cfm maintenance-points remote
--------------------------------------------------------------------------------
MPID Domain Name MacAddress IfSt PtSt
Lvl Domain ID Ingress
RDI MA Name Type Id SrvcInst
EVC Name Age
--------------------------------------------------------------------------------
3100 PROVIDER_DOMAIN aabbcc000599 Up Up
4 PROVIDER_DOMAIN Et0/1100
- customer_100_provider Vlan 100 N/A
N/A 0s
Total Remote MEPs: 1
CCM
Database
t0
t1
t2
CE 11 uPE 11 AGG 11 AGG 31 uPE 31 CE 31
Proactive End-to-End Service Monitoring
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 94
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
UPE11#ping ethernet mpid 3100 domain PROVIDER_DOMAIN vlan 100
Type escape sequence to abort
Sending 5 Ethernet CFM loopback messages to aabbcc000599, timeout is 5 seconds
:!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/5/12 ms
CFM Loopback Message (LBM)
CFM Loopback Reply (LBR)
uPE11# ping ethernet
End-to-end Service/Failure Verification
CE 11 uPE 11 AGG 11 AGG 31 uPE 31 CE 31
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 95
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
CFM Linktrace Message (LTM)
CFM Linktrace Reply (LTR)
uPE11# traceroute ethernet
Service Path Discovery/Failure Isolation
CE 11 uPE 11 AGG 11 AGG 31 uPE 31 CE 31
Ethernet Layer 2 VPN Services
CE 11 CE 31uPE 31uPE 11 AGG 31AGG 11
uPE11# traceroute ethernet
UPE11#
Type escape sequence to abort TTL 64 Linktrace Timeout is 5 seconds
Tracing the route to aabbcc000599 on Domain PROVIDER_DOMAIN, Level 4, vlan 100
Traceroute sent via Ethernet0/1100, path found via MPDB
B = Intermediary Bridge
! = Target Destination
* = Per hop Timeout
MAC Ingress Ingr Action Relay
Action
Hops Host Forwarded Egress Egr Action Previous
Hop
B 1 aabbcc000399 Et0/0100 IngOk RlyMPDB
Forwarded Et0/1100 EgrOK aabbcc000299
B 2 aabbcc000499 Et0/0100 IngOk RlyMPDB
Forwarded Et0/1100 EgrOK aabbcc000399
! 3 aabbcc000599 Et0/0100 IngOk RlyHit:MEP
Not Forwarded aabbcc000499
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 97
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
ELMI Status Enquiry message (Full Status report)
ELMI Status message (Full Status report)
Local UNI ID CE11_UNI
CE-VLAN/EVC Map type Service_Multiplexing
EVC ID EVC_P2P_100
EVC Type Point_to_Point
CE-VLAN/EVC Map vlan 100
EVC Status New, Active
Remote UNI count  configured 1
Remote UNI count  active 1
Remote UNI ID CE31_UNI
Remote UNI status UP
Example:
CE Notification
CE 11 uPE 11 AGG 11 AGG 31 uPE 31 CE 31
Cisco enhancements
to ELMI
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 98
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
CE11#show ethernet lmi evc detail EVC_P2P_100
EVC Id: EVC_P2P_100
interface Ethernet0/0
Time since Last Full Report: 00:49:01
Ether LMI Link Status: Up
UNI Status: Up
UNI Id: CE11_UNI
CE-VLAN/EVC Map Type: Service Multiplexing with no bundling
VLAN: 100
EVC Status: Active
EVC Type: Point-to-Point
Remote UNI Count: Configured = 1, Active = 1
UNI Id UNI Status Port
------ ---------- ----
CE31_UNI Up Remote
ELMI Status Enquiry message (Full Status report)
ELMI Status message (Full Status report)
CE Notification
CE 11 uPE 11 AGG 11 AGG 31 uPE 31 CE 31
Network Stable:
Remote UNI shows
UP
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 99
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
CE NotificationVLAN ID Missmatch
CE 11 uPE 11 AGG 11 AGG 31 uPE 31 CE 31
CE11(config)#interface gig0/0100
CE11(config-subif)#encapsulation dot1Q 100
CE11#show ip interface brief
Interface IP-Address OK? Method Status Protocol
<snip>
GigabitEthernet0/0100 10010010011 YES NVRAM up up
CE Configured with the correct C-VLAN (eg vid 100)
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 100
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
CE NotificationVLAN ID Missmatch
CE 11 uPE 11 AGG 11 AGG 31 uPE 31 CE 31
CE Configured with the incorrect C-VLAN (eg vid 1300)
CE11(config)#interface gig0/0100
CE11(config-subif)#encapsulation dot1Q 1300
Jan 26 00:15:39546: %ETHER_LMI-6-MISMATCHED_VLAN_NOT_CONFIGURED: VLAN 100 not
Configured but in VLAN mapping for UNI GigabitEthernet0/0
Jan 26 00:15:39546: %ETHER_LMI-6-MISMATCHED_VLAN_CONFIGURED: VLAN 1300 configured
but not in VLAN mapping for UNI GigabitEthernet0/0 Interface
CE11#show ip interface brief
Interface IP-Address OK? Method Status Protocol
<snip>
GigabitEthernet0/0100 10010010011 YES NVRAM down down
Proactive ELMI Action
at CPE
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 101
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
Access Aggregation Access
ELMI Status message
Async EVC report
ELMI Status message
Async EVC report
ELMI action:
CE brings down
(sub)interface
ELMI action:
CE brings down
(sub)interface
CFM remote MEP timeout
MEP Down (timeout) alarm
DefRemoteCCM IEEE alarm
EVC declared Inactive
CFM to ELMI Interworking
CFM remote MEP timeout
MEP Down (timeout) alarm
DefRemoteCCM IEEE alarm
EVC declared Inactive
CFM to ELMI Interworking
Failure Scenario: Network Failure
Aggregation
X
CE CE
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 102
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
UPE11#
*Apr 8 04:33:44911: %E_CFM-3-REMOTE_MEP_DOWN: Remote MEP mpid 3100 vlan
100 MA name customer_100_provider in domain PROVIDER_DOMAIN changed state
to down with event code TimeOut
*Apr 8 04:33:44911: %ETHER_SERVICE-6-EVC_STATUS_CHANGED: status of
EVC_P2P_100 changed to InActive
*Apr 8 04:33:47587: %E_CFM-3-FAULT_ALARM: A fault has occurred in the
network for the local MEP having mpid 1100 vlan 100 for service MA name
customer_100_provider with the event code DefRemoteCCM
UPE11#show ethernt cfm errors
--------------------------------------------------------------------------------
MPID Domain Id Mac Address Type Id Lvl
MAName Reason Age
--------------------------------------------------------------------------------
3100 PROVIDER_DOMAIN aabbcc000599 Vlan 100 4
customer_100_provider Lifetime Timer Expired 119s
CE 11 uPE 11 uPE 31 CE 31
X
AGG 11 AGG 31
Error DB
IEEE-defined
alarm
Cisco-defined
alarm
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 103
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
UPE11#ping ethernet aabbcc000599 domain PROVIDER_DOMAIN vlan 100
Type escape sequence to abort
Sending 5 Ethernet CFM loopback messages to aabbcc000599, timeout is 5 seconds
:
Success rate is 0 percent (0/5)
UPE11#traceroute ethernet aabbcc000599 domain PROVIDER_DOMAIN vlan 100
Type escape sequence to abort TTL 64 Linktrace Timeout is 5 seconds
Tracing the route to aabbcc000599 on Domain PROVIDER_DOMAIN, Level 4, vlan 100
Traceroute sent via Ethernet0/1100, path found via MPDB
B = Intermediary Bridge
! = Target Destination
* = Per hop Timeout
--------------------------------------------------------------------------------
MAC Ingress Ingr Action Relay Action
Hops Host Forwarded Egress Egr Action Previous Hop
--------------------------------------------------------------------------------
B 1 AGG11 aabbcc000399 Et0/0100 IngOk RlyMPDB
Forwarded Et0/1100 EgrOK aabbcc000299
*
*
*
*
CE 11 uPE 11 uPE 31 CE 31
X
AGG 11 AGG 31
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 104
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
CE11#
*Apr 8 04:33:44991: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0100,
changed state to down
CE11#show ethernet lmi evc detail EVC_P2P_100
EVC Id: EVC_P2P_100
interface Ethernet0/0
Time since Last Full Report: 00:01:13
Ether LMI Link Status: Up
UNI Status: Up
UNI Id: CE11_UNI
CE-VLAN/EVC Map Type: Service Multiplexing with no bundling
VLAN: 100
EVC Status: Inactive
EVC Type: Point-to-Point
Remote UNI Count: Configured = 1, Active = 0
UNI Id UNI Status Port
------ ---------- ----
CE31_UNI Unreachable Remote
CE 11 uPE 11 uPE 31 CE 31
X
AGG 11 AGG 31
Network Failure:
Remote UNI shows
UNREACHABLE
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 105
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
UNI Link
Down
ELMI action:
CE brings down
(sub)interface
ELMI Status message
Async EVC report
CFM MEP Up (port state Down) alarm
DefMACstatus IEEE alarm
EVC declared Inactive
CFM to ELMI InterWorking
EVC declared Inactive
CFM CCM
Interface Status TLV
“isDown”
X
Failure Scenario: UNI Link Down
CE Access Aggregation Aggregation Access CE
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 106
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
UPE11#
*Apr 8 04:41:54823: %E_CFM-6-REMOTE_MEP_UP: Continuity Check message is
received from a remote MEP with mpid 3100 vlan 100 MA name
customer_100_provider domain PROVIDER_DOMAIN interface status Down event
code PortState
*Apr 8 04:41:54823: %ETHER_SERVICE-6-EVC_STATUS_CHANGED: status of
EVC_P2P_100 changed to InActive
*Apr 8 04:41:57451: %E_CFM-3-FAULT_ALARM: A fault has occurred in the
network for the local MEP having mpid 1100 vlan 100 for service MA name
customer_100_provider with the event code DefMACstatus
UPE11#show ethernet cfm maintenance-point remote
--------------------------------------------------------------------------------
MPID Domain Name MacAddress IfSt PtSt
Lvl Domain ID Ingress
RDI MA Name Type Id SrvcInst
EVC Name Age
--------------------------------------------------------------------------------
3100 PROVIDER_DOMAIN aabbcc000599 Down Up
4 PROVIDER_DOMAIN Et0/1100
- customer_100_provider Vlan 100 N/A
N/A 0s
Total Remote MEPs: 1
X
CE 11 uPE 11 AGG 11 AGG 31 uPE 31 CE 31
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 107
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
CE11#
*Apr 8 04:41:54907: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0100,
changed state to down
CE11#show ethernet lmi evc detail EVC_P2P_100
EVC Id: EVC_P2P_100
interface Ethernet0/0
Time since Last Full Report: 00:01:07
Ether LMI Link Status: Up
UNI Status: Up
UNI Id: CE11_UNI
CE-VLAN/EVC Map Type: Service Multiplexing with no bundling
VLAN: 100
EVC Status: Inactive
EVC Type: Point-to-Point
Remote UNI Count: Configured = 1, Active = 0
UNI Id UNI Status Port
------ ---------- ----
CE31_UNI Down Remote
X
CE 11 uPE 11 AGG 11 AGG 31 uPE 31 CE 31
UNI Failure:
Remote UNI shows DOWN
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 108
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
UNI admin
Shutdown at CE
CE transmits
8023ah Dying Gasp
ELMI action:
CE brings down
(sub)interface
ELMI Status message
Async EVC report
CFM MEP Up (port state AdminDown) alarm
DefMACstatus IEEE alarm
EVC declared Inactive
CFM to ELMI InterWorking
8023ah alarm
EVC declared Inactive
8023ah to CFM InterWorking
X
Failure Scenario: UNI Admin Shutdown
CE Access Aggregation Aggregation Access CE
CFM CCM
Organization-specific TLV
AdminDown
Cisco enhancement
to CFM
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 109
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
Power lost
at CE site
CE transmits Power Failure
8023ah Dying Gasp
ELMI action:
CE brings down
(sub)interface
ELMI Status message
Async EVC report
CFM MEP Up (port state Down) alarm
DefMACstatus IEEE alarm
EVC declared Inactive
CFM to ELMI InterWorking
8023ah alarm
EVC declared Inactive
8023ah to CFM InterWorking
Failure Scenario: Power Failure at CE
CE Access Aggregation Aggregation Access CE
CFM CCM
Interface Status TLV
“isDown”
X
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 110
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
CE exceeds 8023ah
HIGH error threshold
CE sends 8023ah
Event OAM PDUs
ELMI action:
CE brings down
(sub)interface
ELMI Status message
Async EVC report
CFM MEP Up (port state remoteExcessiveErrors) alarm
EVC declared Inactive
CFM to ELMI InterWorking
8023ah to CFM InterWorking
EVC declared Inactive
Failure Scenario: UNI Errors (Detected by CE)
X
Receive Errors
detected by CE
CE Access Aggregation Aggregation Access CE
CFM CCM
Organization-specific TLV
remoteExcessiveErrors
Cisco enhancement
to CFM
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 111
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
SP exceeds 8023ah
HIGH error threshold
SP sends 8023ah
Event OAM PDUs
ELMI action:
CE brings down
(sub)interface
ELMI Status message
Async EVC report
CFM MEP Up (port state localExcessiveErrors) alarm
EVC declared Inactive
CFM to ELMI InterWorking
8023ah to CFM InterWorking
EVC declared Inactive
Failure Scenario: UNI Errors (detected by SP)
X
CE Access Aggregation Aggregation Access CE
CFM CCM
Organization-specific TLV
localExcessiveErrors
Cisco enhancement
to CFM
Receive Errors
detected by SP
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 112
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
CE PE EoMPLS Pseudowire PE CE
Point-to-Point Ethernet Service
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 113
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
CE PE EoMPLS Pseudowire PE CE
E-LMI Directed LDP session E-LMI
OAM Protocol Positioning
PW OAM
To E-LMI IW
PW OAM
To E-LMI IW
ⓒ 2009 Cisco Systems, Inc All rights reserved Cisco Public 114
Deploying Carrier Ethernet OAM
Ethernet Layer 2 VPN Services
CE PE EoMPLS Pseudowire PE CE
CE UNI failure:
Admin “shutdown”
ELMI action:
CE brings down
(sub)interface
ELMI Status message
Async EVC report
PW declared DOWN (syslog)
EVC declared Inactive (syslog)
PW OAM to ELMI InterWorking
EVC declared Inactive
PW declared DOWN (syslog)
Tx LDP TLV Status
(PW status: AC DOWN)
X
Failure Scenario: UNI Failure
Comparison with IEEE 8021ag
IEEE 8021ag
ITU-T Y1731
ME
Maintenance Entity ME Maintenance Entity
Maintenance
MA
MEG ME Group
Association
MAID MA Identifier MEGID MEG Identifier
No such construct
MD
Maintenance Domain --
available
MD
MEG
MD Level
MEG Level
Level Level
MEP MA End Point MEP MEG End Point
MIP
MD Intermediate Point MIP MEG Intermediate Point
No such construct Server
---
Server MEP
available
MEP
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