CIsco PVST MIB Question

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February 5th, 2004, 09:53 AM

Nicolino07

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CIsco PVST MIB Question

Hello,

I'm looking for the mib I should use to poll a Cisco Catalyst 3550-12G to check if a port is STP-Forwarding in a particular VLAN, or blocking. (protocol ISL PVST)
I find the MIB 'cvbStpForwardingMap': 1.3.6.1.4.1.9.9.56.1.1.1.1.2,
but I don't know how to interpret the result (how can I identify the VLAN) and is it compliant with my Network Device (IOS 12.1.(11)EA1)?
Any idea?

Thanx

February 5th, 2004, 01:37 PM

juniperr

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just get on the switch and debug spanning-tree PVST+
or sh spanning-tree stat, or debug spanning-tree switch {all | errors | general | pm | rx {decode | errors | interrupt | process} | state | tx [decode]} why do you want to poll the MIB
for VLAN/port state info? sounds like you are try to hack the network.

cvbStpForwardingMap....

An indication of which ports are forwarding by spanning tree for the specified VLAN. The octet string contains one bit per port on the bridge for the specified VLAN.

Each bit within the octet string represents one port of the device. The ordering of ports represented within the octet string is in the same order as in the RFC 1493 dot1dStpPortTable.

The bit value interpretation related to RFC 1493 dot1dStpPortState values is as follows:

1 = forwarding

0 = disabled, blocking, listening, learning, broken, or nonexistent

Last edited by juniperr : February 5th, 2004 at 01:57 PM.

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