I have two cisco routers currently running ip cef. The gear I have is a 3745 router at the central end and a 2611XM router at the far end. I am load balancing two T1s between them. The WICs are VWIC-2MFT-T1 cards at both sites. The weird problem I am having is this. I am trying to add another T1 to the IP CEF bundle. I have OSPF running on the current T1s and per-packet load-balancing turned on. When I add the new T1 to the router, I add OSPF to the new subnet and make sure that the interface is running ip cef. The WICs that I am using for the new T1 are a VWIC-2MFT-T1 at the central site and a WIC-1DSU-T1 at the remote site. When I turn everything up it looks good in my ip route table on the 3745 router with the VWIC. It now shows that there are 3 routes to the destinations. BUT on the 2611 side with the WIC-1DSU-T1, the sh ip route output shows me that the router is now only using the new single T1 and not load-balancing any traffic over the 2 existing T1s. When I run a sh ip cef <interface> I get that the new WIC has all the CEF info. The cef info for the other 2 T1s off the VWIC show only the attached subnets. They don't have any of the CEF info anymore. I hace tried to clear the cef table, shut down the T1 and restarted but nothing. If I shut the WIC T1 down on the 2611, the cef information now shows load-balancing over the 2 T1s again like it was before. I am not sure if this is a module compatibility issue or a config issue. I was just hoping that someone out there has seen this as well and might know if it might be a bug. I have tried to turn on ip cef distributed in the 2611 router BUT that command is not available for the IOS I am running on it. I am running 12.3(14)T5 IOS on the 2611XM and 12.3(11)T3 on the 3745. Any ideas or help is appreciated.
Thanks for the clue!!! I was putting together the output and noticed that the ospf cost for the new WIC was 64 and the pre-existing WIC had a cost of 65. I am not sure why the new WIC had a cost of 64, maybe because it is a single T1 instead of a dual? Anyway, I changed the ospf cost on that interface to match the cost of the existing WIC and it works now. My thanks again for helping me look in the right place.
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