8610-CPU goes up to 100% load and is connected to ES470 stacks

[saksham]

12 ES470 stacks are connected to one 8610 and one 5632 per GigabitEthernet.
8 of the stacks are working fine, if we connect one of the rest, 8610-CPU goes up to 100% load. So we can't get redundancy for all stacks.
All Layer2 and RSTP. No routing.

[Michael McNamara]

Hi rakeshramani and welcome to the forums!

Hopefully you realize that you have a configuration issue somewhere that is most likely producing a loop, hence your CPU/SF utilization goes to 100% and eventually your network will collapse under the load and stop work (figuratively speaking of course).  Are you connecting each ES470 to the core with multiple links? I'm guessing you are.... have to configured (and enabled) the MLT on both the ES470 and the ERS8600? Users will usually overlook enabling the MLT on either one side of the other and that usually the issue.

Good Luck!

[saksham]

Hi Michael,

Thanks for your support.
But the links are connected in a manner such that one link to 8600 and other link to 5632 from each ES470 stack. so there must be an MLT in each ES470 stack???

[Dominik]

Hi rakeshramani,

check the RSTP settings of your ES470 devices.

! * RSTP/MSTP modes are not supported by ACG *
Not sure what ACG means in this context.

You have an empty STP config on all ES470 , so your switches dosnīt speak STP.
It is uncommon to do redundancy in the Avaya world with STP /RSTP, normally you would create a switchcluster with an active / active network design instead of the active / passiv STP /RSTP design.

Cheers

[Michael McNamara]

But the links are connected in a manner such that one link to 8600 and other link to 5632 from each ES470 stack.

Why are you doing that? Unless you are running Spanning Tree (as alluded to by @Dominik above) your going to create a loop. Is there a link between the 8600 and the 5632? If so then there is your loop... if not I don't understand the design.

so there must be an MLT in each ES470 stack???

If you want to bond multiple links together for redundancy or to provide additional bandwidth you need to use an MLT.

Why are you connecting one link to the 8600 and the other link to the 5632? Are you using the 470 as a distribution switch for transit traffic?

Good Luck!

PS: depending on the version of software the ACG (Automatic Configuration Generator) doesn't support every option being dump to ASCII format.