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>이시우입니다.
>
>burst-size :
>burst를 설정을 하는경우엔 LLQ(low latency queueing)를 사용가능하게 되며, 32 ~ 2백만 ms까지 지정할수 있고.Weighted Fair Queuing상에서 Class Base형태로 고정적인 Priority Queueing을 사용가능하게 합니다.  즉 다른 Packet들 보다 먼저 또는 늦게 Queueing을 할수 있도록 설정합니다. 정확히 말하면 LLQ상에 Committed Burst (Bc) size를 지정하는것을 말하며, 일시적으로 Traffic상이 몰릴경우 Burst값을 조정하게 하여 줍니다.
>
>Excess Burst Size :
>CIR값의 범위값 외부에 있는 non-committed bits의 의 수를 지정합니다.
>보통 이 값들은 discard되어 지는 것을 표시 하기도 합니다.
>
>아래는 Cisco에서 말하는 Traffic Shapping 값들 입니다. 참조하세요.
>
>Traffic Shaping Parameters
>
>CIR = committed information rate (= mean time)
>EIR = excess information rate
>TB = token bucket (= Bc + Be)
>Bc = committed burst size (= sustained burst size)
>Be = excess burst size
>DE = discard eligibility
>Tc = measurement interval
>AR = access rate corresponding to the rate of the physical interface (so if you use a T1, the AR is approximately 1.5 Mbps).
>
>관련된것들만 적어 놓습니다.
>
>Committed Burst Size (Bc)
>The maximum committed amount of data you can offer to the network is defined as Bc. Bc is a measure for the volume of data for which the network guarantees message delivery under normal conditions. It is measured during the committed rate Tc.
>
>Excess Burst Size (Be)
>The number of non-committed bits (outside of CIR) that are still accepted by the Frame Relay switch but are marked as eligible to be discarded (DE).
>
>The token bucket is a 'virtual' buffer. It contains a number of tokens, enabling you to send a limited amount of data per time interval. The token bucket is filled with Bc bits per Tc. The maximum size of the bucket is Bc + Be. If the Be is very big and, if at T0 the bucket is filled with Bc + Be tokens, you can send Bc + Be bits at the access rate. This is not limited by Tc but by the time it takes to send the Be. This is a function of the access rate.
>
>Committed Information Rate (CIR)
>The CIR is the allowed amount of data which the network is committed to transfer under normal conditions. The rate is averaged over a increment of time Tc. The CIR is also referred to as the minimum acceptable throughput. Bc and Be are expressed in bits, Tc in seconds, and the access rate and CIR in bits per second.
>
>Bc, Be, Tc and CIR are defined per data-link connection identifier (DLCI). Due to this, the token bucket filter controls the rate per DLCI. The access rate is valid per user-network interface. For Bc, Be and CIR incoming and outgoing values can be distinguished. If the connection is symmetrical, the values in both directions are the same. For permanent virtual circuits, we define incoming and outgoing Bc, Be and CIR at subscription time.
>
>Peak = DLCI's maximum speed. The bandwidth for that particular DLCI.
>Tc = Bc / CIR
>Peak = CIR + Be/Tc = CIR (1 + Be/Bc)
>
>If the Tc is one second then:
>Peak = CIR + Be = Bc + Be
>EIR = Be
>
>참조사이트
>
>Traffic shaping (Configuring and Troubleshooting Frame Relay)
>http://www.cisco.com/en/US/partner/tech/tk713/tk237/technologies_tech_note09186a0080094372.shtml
>
>GTS
>http://www.cisco.com/en/US/partner/products/sw/iosswrel/ps1831/products_configuration_guide_chapter09186a00800c60cc.html
>
>burst
>http://www.cisco.com/en/US/partner/products/sw/iosswrel/ps1834/products_feature_guide09186a0080080232.html#19231
>
>
>좋은하루 되세요..
>