Hello All, So I just encountered a very strange issue and I was trying to get some more information or opinions on what Just happened.
I am using a Cisco 7507, previously running an RSP16 - 2 GEIP cards and an OC3 card on a VIP2-50. On one particular day one of our GEIP cards lost connectivity to one of our core routers, I used standard troubleshooting techniques IE: change the cable, change the Gbic reset the card - all of which had no effect. I replaced the GEIP with a brand new one and I placed it in a different slot, I still could not get connectivity. As a last ditch effort I reloaded the router and this is where things get weird. After the router reload, we started experiencing odd ISIS issues, on all of our routers we noticed our problem 7507's Loopback address begin to flap I did a sh ip route X.X.X.X and at times it would say x.x.x.x/32 and other times I would just see x.x.x.x/16. Quite obviously this made life for my frame relay customers life misery. After trying all sorts of steps we could not get the flapping to stop. In a last ditch effort we offloaded our OC3 onto another router,( we are still using this router as a lifeboat.) To skip ahead, I ended up getting a new 7507 chassis, brand new RSP 4 and brand new GEIP's and OC3 cards. I reconfigured the router with the same Ip and ISIS config and WHAMMO the same ISIS route flapping begins to happen. After many hours of troubleshooting one thing I did was change the ISIS NET address, once this was changed things went back to normal. Why would changing the NET address suddenly stop an ISIS route from flapping? Apologies for the long email, but this problem has been happening for quite a few weeks now. Any comments or suggestions would be appreciated Thanks DaveJ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
