RPVST Status with SNMP

Lorensen2k11 · ‎09-30-2011

Hi all,

I have some trouble making the following monitoring work;

First of all, i got two Cisco 4500-series switches acting as my backbone.

Next i got 4 additional switches connected them in a loop, as depictured below.

[SW]-----------[SW]

| |

[SW] [SW]

| |

[4500]--------[4500]

In this setup i am running RPVST, of course to prevent loops.

What i would like to do, are to monitor the STP state on the two 4500 (forwarding, blocking, etc.)

- in order monitor whether a link further out in the loop is broken.

Example:

[SW]-----------[SW]

| |

[SW] [SW]

| |

| x

| |

[4500]--------[4500]

I have been trying to use various of Cisco own MIBs to monitor this, but with no luck - any ideas?

Best Regards

Martin Lorensen

dominic.caron · ‎10-03-2011

You could try an applet or a TCL script with EEM.

Lorensen2k11 · ‎10-05-2011

I forgot to mention that we are using Solarwinds Orion to monitor most of our equipment

- Therefor we would like to stick to the MIBs, and keep it all gathered.

jodi.bart · ‎10-07-2011

Hi Martin,

I work for SolarWinds and you might try this UnDP from our thwack community content exchange: http://thwack.solarwinds.com/media/40/orion-npm-content/pollers/92617/spanning-tree-port-state/. Also, you may also want to look at syslog messages as they will notify you in "real-time" when there is a topology change.

If you have any problems with this, please let us know!

Jodi

Lorensen2k11 · ‎10-10-2011

Hi Jodi,

Thanks for your response.

I have tried to use the custom poller you suggest, and sure enough it returns a value.

The problem still is, that it only tells me that the two 4500 are in forwarding mode (5), but doesn't tell me anything about which mode each VLAN are operating in.

So if i should rely on the information returned by this poller, all my switched are Forwarding.

But of course there must be a port in blocking state somewhere, because there's no loop ;-)

Martin