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New Member

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

  • WAN Routing and Switching
Everyone's tags (3)
2 REPLIES
New Member

ATM vc traffic shapping

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

Sorry.

Hall of Fame Super Gold

ATM vc traffic shapping

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.

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