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1983 Views 0 Replies Latest reply: Jul 11, 2011 6:58 AM by Peter RSS

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Monitor session output on WS-C6509

Jul 11, 2011 6:58 AM

Peter 3 posts since
Jun 8, 2010

Hi all,


I have a problem on a WS-C6509 and don't know what is causing this behaviour. On the WS-C6509 there are 2 interfaces configured as an etherchannel in active mode. The etherchannel is connected to a windows server.


The problem is that when i sniff the traffic(by copying the traffic to another port with the monitor session command) on the etherchannel that i can see al kinds of traffic from other hosts in the same vlan. It is not just broadcast traffic as you would expect but also unicast traffic like http or https sessions to other hosts in the vlan.


Below the output of the show monitor detail command:


SWx3#sho monitor detail

Session 1


Type                   : Local Session

Description            : -

Source Ports           :

    RX Only            : None

    TX Only            : None

    Both               : Po34

Source VLANs           :

    RX Only            : None

    TX Only            : None

    Both               : None

Source RSPAN VLAN      : None

Destination Ports      : Fa9/1

Filter VLANs           : None

Destination RSPAN VLAN : None


The channel config below:

SW13#sho runn int po34

Building configuration...


Current configuration : 206 bytes


interface Port-channel34

description vh15

no ip address


switchport trunk encapsulation dot1q

switchport trunk native vlan 1001

switchport trunk allowed vlan 1

switchport mode trunk




Is there something wrong with monitoring etherchannels or is this switch kind of acting as a hub??!


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