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Beginner

ATM vc traffic shapping

I noticed that different routers have different Maximum Burst Size (PCR) when configuring ATM vbr-nrt shaping see below,  which can be configured PCR only to 44209K. Another router has PCR of 40700K. Our contract speed( no CIR) with AT&T is 44736K (Fulll DS3).  Is there  any ATM card which can go to 44736?  Thanks.

ROUTER(config-if-atm-vc)#vbr-nrt  ?

  <1-44209>  Peak Cell Rate(PCR) in Kbps

interface ATM4/1/0

no ip address

ip route-cache flow

atm scrambling cell-payload

no atm ilmi-keepalive

!

interface ATM4/1/0.1 point-to-point

ip address 10.17.1.205 255.255.255.252

shutdown

pvc 1/777

  vbr-nrt 44209 44209 1

      

Alison

2 REPLIES 2
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Beginner

It is the Peak Cell rate (PCR) not Maximum Burst Size.

Sorry.

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Hall of Fame Master

Some IOS version or handrware drivers allow entering a wrong value for CRs, that is they allow the full physical line rate rather than the bandwitdh available to ATM, that is excluding DS3 overhead. The second approach is correct.