ATM Switches and NSAP Help

[adcunha]

Hi

We have ATM infrastructure consisting of Cisco 8540, LS1010 and 8510 which is running 12.1(23). The Switches were configured in hard PVC on the ATM0 and MAP-list and was working fine for last couple of years.

Recently we decided to implement ARP Server with redundancy on these switches.

WE configured the 2 ATm switches as ARP servers one as primary and other as secondary. Configuration for the client was done and everything initial looked fine. Later we relized the following entries on the ARP server

ip 10.2.1.113 atm-nsap 47.009181000000000532457C01.111111111111.00 broadcast and when we tried to remove the entries the swithes crash and go to Rommon> mode. We removed the configuration for ARP server but these entries remained. Did anyone had encountered similar type of problem. WE have around 30 ATM switches in the network.

Thanks

[pradeepde]

The problem in your case is that you are using an IOS version which is prone to lot of known issues inlcuding this one. The nsap entries you are referring to gets automatically generated and cannot be removed. If you try to remove it from the command line it results in a crash. The best work around for this issue is to upgrade the IOS to the latest version.

[nchidamb]

Based on the config you have mentioned

" ip 10.2.1.113 atm-nsap 47.009181000000000532457C01.111111111111.00 broadcast "

I believe you had RFC 1483 SVC ( not PVC as you mentioned ) and recently you moved to RFC 1577 ( CLIP ). If so, instead of removing the entries from the map-list, you can try deleting the map-list itself to clean up the config. In any case, just removing that entry should not have caused a crash. Is it a one time occurance or is it happening everytime you try to remove it?

-Nat