AGIS upgraded its router at the Sprint NAP to an RSP (from SP/SSP), and at the same time had to upgrade the FDDI interface. It hasn't really worked right since. It turns out through experimentation, any return traffic coming through Pennsauken dies on that router. So we've essentially taken the Sprint NAP router off the net while we figure out what's wrong. [That, by the way, is why it's so important to see as many networks in as many places as possible.]
We've spent the time since try to determine if we have:
- a FDDI problem
When switching cards/upgrading things, you could try setting the old mac address in software for the new fddi interface, if the fddi card itself is new (has a different mac address). This is a common problem with hot-swapping ethernets - switches and other routers sometimes don't expire arp properly.
- an RSP problem - an undesirable SMDS/IOS interaction (we use SMDS to get into Pennsauken from our net)
11.0.9 works weel for us on 7505s.
- some other undesireable hardware/IOS interaction - routing or other configuration on the Pennsauken router - routing or other configuration on any other router
I'll let you know what we find out. We've pretty much eliminated routing or FDDI, and are looking at SMDS/IOS or some other config issue.
Peter
These things are a bitch... Good luck, Avi