span configuration

From: ccieim@comcast.net
Date: Sun Mar 05 2006 - 14:46:07 GMT-3

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Hi group,
I'm trying to testing some configuration that I'm cleared on SPAN features. I try to monitor the trunk port and only want to monitor specific vlan on the trunk. However, I'm unsuccessful to make the monitoring feature work. Here is my config:
sw1(config)#do sh run int f0/24
Building configuration...
Current configuration : 95 bytes
!
interface FastEthernet0/24
 switchport trunk encapsulation dot1q
 switchport mode trunk
end
sw1(config)#do sh run | i monitor
monitor session 1 source interface Fa0/24
monitor session 1 filter vlan 10
monitor session 1 destination interface Fa0/20 ingress untagged vlan 10
sw1(config)#
If I configure both switches with rspan, then I can capture the traffic on my sniffer with no problem.
Can some expert out there shed me some light?

Thanks,
Don

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