Interesting problem (HELP, please)

July 31, 2008 @ 10:09 pm · Filed under CCIE Study

You are not at 299 Park Ave, are you?
I have worked on an IDENTICAL setup with MPLS from MCI in the middle of 2 catalyst 6509’s. the catalyst 6509’s were running VPN service modules (yes the “crypto connect” command. Worse, there was some 10000 series cisco’s running L2TPv3 between the sites to bridge a vlan between the sites, so that servers at 2 locations could be on the same local network.
Hmmm… this stinks,
But anyway I would check the MLS cache on each switch…
Show mls cef or show mls ip.
The best way to resove these issues is to reboot the switch… it’s a known but with the big cats- the MLS SE has corrupt information and until something changes on the MLS RP (yes even in native mode) things are broken.
As lame as it sounds try a reboot on one or both. I wasted an entire memorial day (a beautiful sunny one) because I could not get an IBGP neighborship to established state… it was because of this catalyst 6509 bug, where an igp route changing screwed over the cef table.
-Joe
—–Original Message—– From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of CCIEDAVITO CCIEDAVITO Sent: Thursday, July 31, 2008 9:51 PM To: ccielab@groupstudy.com Subject: Interesting problem (HELP, please)
Have any of you ran into the following problem?
We have two Cat6500 (Sup720) running IOS Natively They are connected across a WAN (essentially, a bridge, with a number of players in the middle, handed off as RJ45 at both ends)
Their connected interfaces are addressed with a /30 network, and can ping each other (1500 byte packets flow across fine)
With Static routes configured on both ends, end user devices and servers can talk to devices across the link without an issue We cannot establish an EIGRP neighborship across this link We cannot establish a BGP neighborship across this link If I telnet from one switch, to the other, I get connected, but never get a prompt to login, and eventually loose the telnet session.
If any of you have any thoughts about this, I’d be glad to hear them.
Thanks.
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