Port mirroring (monitor) across cisco switches
Posted on 2012-04-12
I'm trying to monitor a port from a cisco switch, the problem is that my destination port for receiving the packets is in another switch. I have done the following and I can't get it to work. I created a vlan 15 for RSPAN on the server VTP core switch so that its populated to all the client switched (6 switches in total). After doing that I created a session in my source switch (which has the port that I would like to mirror) as follows
monitor session 1 source int fa0/20
monitor session 1 dest remote vlan 15
On my destination switch I did the following:
monitor session 1 source remote vlan 15
monitor session 1 dest int fa0/1
Now if I did this correctly when I sniff the traffic on that port fa0/1 i should see everything that is happing in the source switch on int fa 0/20.
For some reason this is not working, is there anything that I'm missing here?