testing ERS4548GT stack interface

[Johan Witters]

Hi guys,

I'm suspecting problems with the stacking interfaces of a unit in a 4500 stack. I temporalily replaced the unit, but now I have some questions:

Is there a method to check if the stacking interfaces on a switch are working ok?
Is it possible to perform the test when the unit is not in the stack, like connecting a cable from cascade up to cascade down?

[Flintstone]

Hi Johan,

I use the following commands to check my stacks:

show stack health - Status info
show stack-info - Status info
show stack port-statistics - This should show if any packets are being dropped?

You can also check the log to see if there any errors?

CheerZ and good uck

[Johan Witters]

Hi Flintstone,

unfortunately I could not find any strange things in the logs.. At the moment the switch is no longer connected to the stack.

I know Cisco has the possibility to test the stack links, but I can't find any info on Nortel/Avaya

[Dominik]

Hi Johan,

you can also try to enable the Stack Monitor / StackErrorNotification.
If you have a second ERS4500 go to the Lab and test with only one stacking cable. So you can check both ports separtly.

Good Luck

[Flintstone]

show stack port-statistics - This should show if any packets are being dropped?

You can check the port statistics on a unit basis, so if there are any errors on the stack links they should show up?

CheerZ

[Michael McNamara]

I know Cisco has the possibility to test the stack links, but I can't find any info on Nortel/Avaya

There are a number of ways to test the stack (cascade) ports... some of which require you to take the switch offline.

http://blog.michaelfmcnamara.com/2008/07/ethernet-routing-switch-5500-stack-troubleshooting/

Good Luck!