Since upgrade SNMP shows stack ports down, but they are not...

[Joris Deprouw]

Hi Guys,

I have upgraded some 2960S switches from version 150-2.SE11 to version 152-2.E8.

I have no production problems, but since then I have some alerts in my monitoring about the stack ports.

All stack ports show down. When I do a show switch detail. The ports show up.

switch#show snmp mib ifmib ifindex detail
Description ifIndex Active Persistent Saved
-------------------------------------------------------------------------

GigabitEthernet1/0/39 10139 yes enabled yes
GigabitEthernet2/0/7 10607 yes enabled yes
GigabitEthernet2/0/18 10618 yes enabled yes

...
StackSub-St2-2 5142 no enabled yes
...
StackSub-St3-2 5145 no enabled yes
...
StackPort1 5137 no enabled yes

Our 2960X switches which have been upgrades as well to version 152-2.E8 do not show this issue.

Any idea's? Or tac case material?

Thanks,
J

[Reza Sharifi]

Hi,

Most likely an SNMP bug. Open a ticket with TAC.  Sometimes, you have to also open a ticket with the management software vendor to get it resolved.

HTH

[Joris Deprouw]

Hi,



The issue was resolved after applying below workaround to clean up the corrupted/wrong database:



1) Remove "snmp ifmib ifindex persist" from the config with:
2) Reload the switch, and bring up again with the same image
3) Add "snmp ifmib ifindex persist" CLI again and then write




After that the issue was resolved.



Br,

J