Summary: we recently upgraded a router and circuit at one site. Router was upgraded to a 3825 from a 3640, circuit upgraded from a 3xATM/IMA to a 15 Mbit ATM DS3. All prior connections reconnected, and are working fine, except one.
Once a minute, every minute, a get the syslog EIGRP message (truncated) on this pvc:
06-05-2008 09:29:21 Neighbor 192.168.101.122 (ATM1/0.35) is up: new adjacency
06-05-2008 09:29:21 Neighbor 192.168.101.122 (ATM1/0.35) is down: retry limit exceeded
All EIGRP timers are default settings; I have run pings without any losses; I am not getting any other messages related to the other pvc on this new router.
SH IP EIGRP NEI shows a Q CNT of 1 on this link.
I am getting quite a few input errors and giants on the other end of this circuit, which is a frame-relay btw. It also has an mtu of 1500, whereas I think the 3825 has a mtu of 4470. No other errors seen on 3825 at interface or pvc (subinterface) level.
This is probably layer 2.... Try a couple of things. First, ping to 184.108.40.206. I'm guessing this is working, because you're building an adjacency in the first place, but it's always where I start anyway. Then pint unicast between the two routers, say 10000 packets, with a very low timeout, say 0 seconds.
Next, try pinging with a range of sizes (it's under the advanced options in the ping command--don't put in an address, just do ping, then follow the prompts, and when it asks you for advanced options, say yes). Make certain you put the final size as what the MTU for the link should be.
I'm guessing you either have unidirectional unicast only, unidirectional multicast only, or an MTU problem on the link. It's far too consistent to be random errors, I think.
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