BPS Base switch loosing Management IP and rebooting??

[Dualie]

We have been seeing some wacky problems on the LAN here and at remote sites.
2 issues at hand:

1)Stacks of three or more (pure) Business Policy Switched stacks are randomly rebooting. Some on the LAN with gig uplinks to 8600's and some with copper uplinks at smaller T1 sites.

2)Stack of pure BPS's loose management ip only, but are still passing packets through all switches. Just can't manage the stack via IP??

All code is at 2.5.2 with SSH. Nortel recommended that I upgrade to 3.1.6. I performed this to on one problematic stack for issue 2 and it looked good for a couple of weeks but then it happened again.
Right now Nortel is stumped!

Any thoughts would be appreciated.
Thanks Dualie

 

[norteldude78]

disable igmp proxy, also check system log. any errors?

peace

 

[Dualie]

hi norteldude78,

Thanks for the insight. I have checked the IGMP configurations and they are both set ( snooping & proxy ) to disable.

Also, the sys errors on the switch don't show much of anything except 'link up & down' and the code upgrade that was performed earlier.

I have seen other threads out there about 5510's and management ip's losing pings b/c of high cpu utilization.

Wonder if this is similiar?

Thanks Dualie

 

[norteldude78]

Are these uplinks DMLT's or SMLT's?? I know mlt's have "connectivity issues" only solved by upgrading to 3.1.7 (release notes for 470-3.1.7). I imagine BPS would act the same.

Too bad they don't say what these "issues" are.

Also, try swapping MDA's, perhaps the MDA is bad. Or cascade module.

When you lose stack management IP, can you get to the stand-alone IP? That might tell you the stack is failing and the cascade module has problems.

peace

 

[Dualie]

actually neither. bps's are in a pure stack of three with 1 gig sx link down to the core 8600.

nothing special on the bps's.
default vlan, auto on, stp off.

just random reboots??

i thought of someone doing a network scan and causing the bps buffer to be overwhelmed, thus causing it to reboot?? just a guess at this point.

thanks dualie

 

[norteldude78]

That sounds plausible, it would be nice to see what traffic is coming in when it reboots. Anything in system logs? Any packet traces?

peace