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Check cisco 3750 stack status

Current Version
Last Release Date
Compatible With
  • Nagios 1.x
  • Nagios 2.x
  • Nagios 3.x
  • Nagios 4.x
  • Nagios XI
check_snmp_cisco_stack.plVersion 1.3.3 (20160219)
Network Monitoring Software - Download Nagios XI
Log Management Software - Nagios Log Server - Download
Netflow Analysis Software - Nagios Network Analyzer - Download
Check the status of a Cisco Catalyst 3750,3650,3850 stack via SNMP
This perl script checks via SNMP the status of a Cisco Catalyst 3750,3650,3850 stack. It needs the Net::SNMP module available from CPAN.

**NOTE 1:** The plugin needs IOS 12.2(25)SEE or greater that include the support for the CISCO-STACKWISE-MIB.

**NOTE 2:** There is a bug (CSCsg18188) in IOS below 12.2(35)SE. Cisco recommends to not poll these mibs. (Thanks to Terry Truebenbach).

**NOTE 3:** There is a bug (CSCse53528) in IOS below 12.2(35)SE. cswRingRedundant returns false for stack of cat 3750-48TS/3750-24TS correctly configured in redundant format. (Thanks to Rolf Wiebel).

20160216: Release 1.3.3
* Added 'removed' state. Thanks to Paulisse85 and srdjanb

20140224: Release 1.3.2
* Changed the logic to get the oid to support other switches other than 3750 (Thanks to Marco Gruber)

20130308: Release 1.3.1
* Modified by Onlight, Inc.

20071018: Release 1.2.1
* Remove critical status for provisioned switch.

20070621: Release 1.2
* Added a validation for the stack ring speed. If a stack port goes down on any stack member, the speed goes from Full to Half which will put the plugin in a WARNING state (Thanks to Martin Tremblay).
* Added a debug switch (-D).
* Added an alarm switch (-A) to simulate an alarm without the need to break the stack.

20070227: First release 1.1

**Any comment/improvement/patch is welcome.**
Reviews (7)
bywershlak, November 27, 2015
This plugin is very helpful monitoring Cisco stacks. However, With the bugs mentioned and no recent updates I decided to rewrite this in python for my environment. I need to add support for SNMP version 2 but, if your still using version 1 you may check out my plugin.

byPaulisse85, May 7, 2015
I'm very happy with this script! Wonderfull.

However, you are missing a very important state! 'removed'

We had a power outage and the script broke due to this and did not report a valid response

/usr/lib64/nagios/plugins/check_snmp_cisco_stack: Use of uninitialized value in concatenation (.) or string at (eval 1) line 150,.

'1' => 'waiting',
'2' => 'progressing',
'3' => 'added',
'4' => 'ready',
'5' => 'sdmMismatch',
'6' => 'verMismatch',
'7' => 'featureMismatch',
'8' => 'newMasterInit',
'9' => 'provisioned',
'10' => 'invalid',
'11' => 'Removed',

Apart from that, thank you very much!
bysiggi, November 25, 2014
Good script!

However I would like to see more checks in this.. for example temp cpu etc of individual devices in the stack, is that possible?
The OID for stack state ( can return Integer:11 which does not have appropriate entry in %STACK_STATES.
According to


after line 45, one more line should be added:

'11' => 'removed'

With this change (and the one pointed out by tt-ts), it works great. Thanks!
To get a 3650 Stack working you have to replace the line...

my $id = ( $$result{$key} * 1000 ) + 1;

... with ...

my @key_split = split('\.', $key);
my $id = pop @key_split;

3750 will work with this change as well.
bytt-ts, November 18, 2011
1 of 1 people found this review helpful
First of all: thanks for that good piece of code

but in line number 142 there is a small bug

if ( $members{$member} == 4 or 9 )

this condition always turns to true (at least for me)

I guess it should be:

if ( $members{$member} == 4 or $members{$member} == 9 )


byalfred, July 13, 2011
1 of 1 people found this review helpful
i tested it with a 2960s stack and it seems to work perfectly