How to captuer filter the spanning-tree protocol in trunk interdace

[cjrchoi11]

I'm able to capture filter with EtheReal STP bridge MAC@01:80:c2:00:00:00 in the access interface but cannot in the switch trunk. Any idea why and how to?

Thanks in advance,

[didyap]

Here is a link for SPAN configs on 3550 :

http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12119ea1/3550scg/swspan.htm#1078974

There are certain limitations which are mentioned in the link above :

You configure SPAN sessions by using parameters that specify the source of network traffic

to monitor. Traffic monitoring in a SPAN session has these restrictions:

You can monitor incoming traffic on a series or range of ports and VLANs.

You can monitor outgoing traffic on a single port; you cannot monitor outgoing traffic on multiple ports.

You cannot monitor outgoing traffic on VLANs.

The command syntax would be like

Switch(config)#monitor session 1 source interface fastethernet 0/2 both

Switch(config)#monitor session 1 destination interface fastethernet 0/8