EIGRP version mismatch causing issues

[Ricky S]

Hi everyone, this post is directly related to one of my previous posts where I described an issue I have with EIGRP offset lists not working between my primary, secondary routers and the core switch.

https://supportforums.cisco.com/message/3976320#3976320

Both primary and secondary routers are running version 15.xx IOS and the core 3750 stack is running 12.xx

After doing extensive research I found out the cause of offset list not working is due to EIGRP version mismatch between the routers and the switch.

Routers are running EIGRP version 9.0 and the switch is running version 5. Apparently there are issues, as listed on Cisco's site, where offset list does not properly "off set" a route if the other end was running EIGRP version lower than 6.

My question (quite possibly a dumb one), if I update the IOS on the 3750 stack, would that also update my EIGRP version? I don't have a spare 3750 to test this out on, hence why I'm asking you folks.

[Gregory Snipes]

EIGRP version 6 was introduced in the IOS version 12.2(50)SE for the 3750, referenced here(http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/15.0_2_se/release/notes/OL25301.html#wp1047686).

If you upgrade the 3750 to at least that version you should be good to go.

[Ricky S]

Hi Gregory, thanks for the info. I just check the Cisco bug toolkit again and I stand corrected. As per the below link, this issue happens with a router running EIGRP version 8 or later is peering with a device that's running EIGRP version 7 or older. It also mentions "named mode" and "classic mode". I am not sure what those are.

https://tools.cisco.com/bugsearch/bug/CSCub10609

I am going to try and upgrade the IOS on my router to the ones they suggested and see if that resolves the issue.

Thanks again.

[Gregory Snipes · Accepted solution]

Doesn't look like the 3750s support EIGRPv8 or will anytime soon. So the only option here is to change the IOS on your core routers.

You have two options with regard to the router IOS, 1) downgrade to a version of code that does not use EIGRPv8, or 2) upgrade to a version where this bug is fixed like 15.4(0.1)T. I am not sure what the exact hardware platform your routers are so I'm not sure what releases are currently available for them.

As for named mode, that was a feature that was added in v8 to allow running EIGRP as virtual instances.

[Ricky S]

Thanks. I am Cisco 2951 ISR running the VPN ISM module which requires version 15.xx or higher. I'll try to upgrade to 15.3xxx