Span-Rspan

[sameermunj]

Hi

I am running HSRP between my 2 4507 switches (Sup-6LE)...I want to monitor one port from Switch 1 and another port from Switch-2 with same destaination which means my destination port will be on Switch-2..In short i will 1 rspan session for Switch-1 and one Span session for switch-2 with destination port om switch-2

is it possible to have this kind of scenario wherein 1 port is the destination for span and rpsan session..as per cisco documenation

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A destination port can participate in only one SPAN session at a time. (A destination port in one SPAN session cannot be a destination port for a second SPAN session.)

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They have not talked about span/rspan combination..please suggest..4500 is running latest cisco ios..

[Amit Singh]

Hi,

You can achieve that. You have to create a RSPAN vlan on switch 1 to carry your remote traffic to Switch 2 and then you can have both the RSPAN vlan and local interfaces as the source of the same session.

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.1/20ew/configuration/guide/span.html#wp1020415

HTH,

-amit singh

[sameermunj]

Hi Amit

Thanks for the reply..

so in switch 1 i will source as port which i want to monitor and destaination as RSPAN vlan

and in switch 2 i will have source as RSPAN vlan as well as the local port which i want to monitor port and destination as the port where the analyzer is connected on switch 2..

so this kind of topology is supported..

[Amit Singh · Accepted solution]

Hi Sameer,

Aplogies, I made a mistake in my above post. This is not supported. It was a typo in my earlier post. I wanted to tell you that on a Cat 4500 a SPAN/RSPAN session can co-exist but you cannot have a the same destination port for the sessions.

I also just tried the same toplogy in my Lab and it doesnot work. Switch wont let you add the local ports as the source port of the RSPAN session. You have to have two destination ports in your topology, once for th RSPAN session and one for the local SPAN session.

Energywise(config)#monitor session 1 source remote vlan 99

Energywise(config)#monitor session 1 source interface gig 2/9
% Cannot add ports as source for session 1 - a RSPAN Destination session

Apologies again for the confusion. Hope this will help.

Cheers,

-amit singh

[sameermunj]

Hi Amit

i wanted to confirm same thing so i replied you back again...

now as per documentation,same port cannot be destination port for 2 diffrent sessions

Session 1 source Remote vlan 100 (Traffic taken from Switch 1) destination port 2/5 (monitoring port on switch 2)

session 2 source 2/10 (local port on switch 2) destination port 2/5 (monitoring port on switch 2)

so it seems my scenario wont work...