[c-nsp] OSPF stability issues with 12.2SXI on 6500/Sup720?

[Justin M. Streiner]

Has anyone seen any serious stability issues with OSPFv2 in 12.2(33)SXI? 
I've tried both SXI6 and SXI7 Advanced Enterprise, and in both cases, 
after about two weeks of normal operation, OSPF sessions will start 
dropping on the affected switch, due to an expired dead timer.  Devices at 
the other ends of those adjacencies do not report them dropping for any 
odd reason, but they do report the adjacencies re-establishing.  I've seen 
no underlying interface-level errors.

The issue appears to be specific to OSPFv2.  I have not seen any stability 
problems in OSPFv3 adjacencies on the same device.  It almost seems like 
OSPFv2 in 12.2(33)SXI could be mangling hellos, or simply stop sending 
them.  Unfortunately I didn't have the time to investigate that in depth, 
during the issue I dealt with today.

I backed off to 12.2(33)SXH5 Advanced IP Services and the problem went 
away.  This is the second time an upgrade to 12.2SXI was done and had to 
be backed off.  I haven't found anything interesting in the release notes 
yet for 12.2SXH - 12.2SXJ that leads to an answer.  A cursory look through 
the bug toolkit also didn't turn up any really good matches.

The overall configuration isn't terribly exotic.  The 6500 is dual-stacked 
- IPv4 IGP is OSPFv2 and IPv6 IGP is OSPFv3.  There is one VRF being handled
by a separate OSPFv2 process in the box.  There are LDP and MSDP peers with
other core devices on the backbone.  No BFD, and currently no 
authentication on the OSPFv2 neighbors.

I have a case open with TAC on this, but I wanted to see if these symptoms 
line up with behavior that other people might have seen.

jms