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New Member

ATM PVC issue.

I have vlan 1 configured on my Catalyst 5000 with an Ip address of assigned to interface sc0. I have IP address assigned to int atm 2/0.1 on my 7200 router. I have an ATM LANE blade in my Catalyst 5000 (which is connected back-to-back to the 7200) and I want to be able to ping from one side to the other across the ATM link.

I have tried:

Catalyst 5000:

session 5 (to get onto ATM LANE blade)

interface atm0.1 point-to-point

atm pvc 3 1 100 aal5snap

atm bind pvc vlan 3 1


interface atm 2/0.1 point-to-point

ip address

pvc 1/100

encapsulation aal5snap

When I try the ping from 7200 to Catalyst 5000, the pings time out and on the ATM LANE blade it shows an error for each ping as follows:

Number of received Frame dropped due to bad AAL5 length 10:

Anyone know what is going wrong? I have tried all I can think of!



Cisco Employee

Re: ATM PVC issue.

The cat5k is going to send ethernet packets in AAL5snap frames while the router expects IP frames. You have to configure the router for IRB or RBE.

More information at the following URLs:

New Member

Re: ATM PVC issue.

Just tried that and it works a treat - thanks!

New Member

Re: ATM PVC issue.


i'm glad to hear it works now.

i was wondering what if you will use "atm routed-bridged ip" under the point-to-point interface on 7200 ...

thank you,


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