Campus Manager

[Network Dude]

Hello,

I wonder if anyone can help, I have 7 Cisco 3750s that as soon as the Data Collection Schedule kicks in, every 4 hours, SNMP stops on the switches.  The switches are still available on the network however Fault Manager and our separate SNMP monitoring tool flag up the issue.

I have other 3750 switches with the same IOS on them and they are not affected.

Has anyone seen this before?

Thanks in advance,

David.

[Joe Clarke]

When this problem occurs, you need to capture the output of "show stack PID" from a switch where PID is the process ID of the SNMP ENGINE and IP SNMP processes.  You may need to run these commands a few times in quick succession while the problem is occurring.  Post the output as well as the show version from the switch.

[Network Dude]

Hi there,

Thanks for that d sorry for the late reply, I have been on holiday.  Here is the output from sh stack PID

#sh stack 253

Process 253: IP SNMP

Stack segment 0x407A8B0 - 0x407D790

FP: 0x407D6C0, RA: 0x1254EE4

FP: 0x407D780, RA: 0xA6B34

FP: 0x407D788, RA: 0x941AF0

FP: 0x0, RA: 0x9387B8

#sh stack 253

Process 253: IP SNMP

Stack segment 0x407A8B0 - 0x407D790

FP: 0x407D6C0, RA: 0x1254EE4

FP: 0x407D780, RA: 0xA6B34

FP: 0x407D788, RA: 0x941AF0

FP: 0x0, RA: 0x9387B8

#sh stack 253

Process 253: IP SNMP

Stack segment 0x407A8B0 - 0x407D790

FP: 0x407D6C0, RA: 0x1254EE4

FP: 0x407D780, RA: 0xA6B34

FP: 0x407D788, RA: 0x941AF0

FP: 0x0, RA: 0x9387B8

#sh stack 255

Process 255: SNMP ENGINE

Stack segment 0x40806C8 - 0x40835A8

FP: 0x40831E8, RA: 0x1254EE4

FP: 0x4083220, RA: 0x51FC70

FP: 0x4083238, RA: 0x58AFB4

FP: 0x4083260, RA: 0x58B1B8

FP: 0x4083340, RA: 0x587E7C

FP: 0x4083360, RA: 0x5893F4

FP: 0x4083380, RA: 0x58978C

FP: 0x4083388, RA: 0x41D904

FP: 0x40833A0, RA: 0x94642C

FP: 0x40833B0, RA: 0x946584

FP: 0x40833C8, RA: 0x9468F8

FP: 0x40833D0, RA: 0x41D364

FP: 0x40833F0, RA: 0x117D5C0

FP: 0x4083428, RA: 0x117BDBC

FP: 0x4083470, RA: 0x115EAB0

FP: 0x40834D8, RA: 0x1135D78

FP: 0x4083540, RA: 0x1128B1C

FP: 0x4083598, RA: 0x114FFCC

FP: 0x40835A0, RA: 0x941AF0

FP: 0x0, RA: 0x9387B8

#sh stack 255

Process 255: SNMP ENGINE

Stack segment 0x40806C8 - 0x40835A8

FP: 0x40831E8, RA: 0x1254EE4

FP: 0x4083220, RA: 0x51FC70

FP: 0x4083238, RA: 0x58AFB4

FP: 0x4083260, RA: 0x58B1B8

FP: 0x4083340, RA: 0x587E7C

FP: 0x4083360, RA: 0x5893F4

FP: 0x4083380, RA: 0x58978C

FP: 0x4083388, RA: 0x41D904

FP: 0x40833A0, RA: 0x94642C

FP: 0x40833B0, RA: 0x946584

FP: 0x40833C8, RA: 0x9468F8

FP: 0x40833D0, RA: 0x41D364

FP: 0x40833F0, RA: 0x117D5C0

FP: 0x4083428, RA: 0x117BDBC

FP: 0x4083470, RA: 0x115EAB0

FP: 0x40834D8, RA: 0x1135D78

FP: 0x4083540, RA: 0x1128B1C

FP: 0x4083598, RA: 0x114FFCC

FP: 0x40835A0, RA: 0x941AF0

FP: 0x0, RA: 0x9387B8

I have also attached the switch config.

I really appreciate your hep with this.

Thanks,

David.

[Joe Clarke]

I need the show ver from this switch to be able to decode the stack.

[Network Dude]

Morning Joseph,

Attached is the sh ver as requested.

Thanks again for your help.

David

[Joe Clarke]

This looks like CSCsz89393.  If switch stacks contain more than four high-capacity switches, SNMP can be slow to respond.  The fix is in 12.2(50)SE3 or 12.2(52)SE.