ATM vbr-nrt class of service

From: ccie2be (ccie2be@nyc.rr.com)
Date: Thu Oct 23 2003 - 12:59:01 GMT-3

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Hi,

I have the following:

R1-------ATM switch (Lightstream100) ---------R2

R1 config:

int ATM0
ip addr x.x.x.1 m.m.m.m
atm nsap-address xx.xxxx.xx.xxxxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xx (provided
by "carrier")
no atm ilmi-keepalive
pvc 0/5 qsaal
pvc 0/16 ilmi
!
!
svc ccie2be nsap xx.xxxx.xx.xxxxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xx
(remote nsap)
    protocol ip x.x.x.2 broadcast
    vbr-nrt 1200 800 72 1000 500 64
    encap aal5mux ip

R2 config:

int ATM0
ip addr x.x.x.2 m.m.m.m
atm nsap-address xx.xxxx.xx.xxxxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xx (provided
by "carrier")
no atm ilmi-keepalive
pvc 0/5 qsaal
pvc 0/16 ilmi
!
!
svc ccie2be nsap xx.xxxx.xx.xxxxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xx
(remote nsap)
    protocol ip x.x.x.1 broadcast
    vbr-nrt 1000 500 64 1200 800 72
    encap aal5mux ip

Without the vbr-nrt statement on each router, I can successfully ping the
remote router, but with the vbr-nrt statement, the ping doesn't work. Can
anybody explain why that is? The ATM interface on the switch supports 155
mbps and the vbr-nrt parameters were taken directly from the solution
configuration.

Thanks in advance, I would greatly appreciate any insight that can be
offered.

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