RSPAN Problems

[MattSherman5680]

Hello, 

I have a simple RSPAN setup between two 3560 switches.  All ports are in VLAN 1.  When I try to monitor VLAN 1 as a source I lose all connectivity to the remote switch as soon as I enable the RSPAN.  If I use physical ports as the source traffic the connectivity stays up but the only traffic I see on the remote capture port is broadcast and multicast.  Any ideas on what I'm doing wrong?

Source Switch

vlan 902
remote-span

!

monitor session 1 source interface Gi0/43
monitor session 1 destination remote vlan 902

#show monitor
Session 1
---------
Type : Remote Source Session
Source Ports :
Both : Gi0/43
Dest RSPAN VLAN : 902

#sh int trunk

Port Mode Encapsulation Status Native vlan
Gi0/1 on 802.1q trunking 1

Port Vlans allowed on trunk
Gi0/1 1-4094

Port Vlans allowed and active in management domain
Gi0/1 1-3,5-9,90,100,902

Port Vlans in spanning tree forwarding state and not pruned
Gi0/1 1-3,5-9,90,100,902

Destination Switch

vlan 902
remote-span

!

monitor session 1 destination interface Gi0/6
monitor session 1 source remote vlan 902

#show monitor
Session 1
---------
Type : Remote Destination Session
Source RSPAN VLAN : 902
Destination Ports : Gi0/6
Encapsulation : Native
Ingress : Disabled

#show int trunk

Port Mode Encapsulation Status Native vlan
Gi0/1 on 802.1q trunking 1

Port Vlans allowed on trunk
Gi0/1 1-4094

Port Vlans allowed and active in management domain
Gi0/1 1-3,902

Port Vlans in spanning tree forwarding state and not pruned
Gi0/1 1-3,902

[balaji.bandi]

Do you have network topology how these Switches connected ? like Source Switch and Designation SPAN port.

[MattSherman5680]

Hi,

Yes, see attached.  I changed the VLAN from 1 to 2 on the assumption that it might be a native VLAN thing but didn't make a difference. 

[balaji.bandi]

just checking is this a real world setup or any simulation lab ?

[MattSherman5680]

It's real

[paul driver]

Hello

Once a destination port is a part of a span session it doesn't work as a normal switchport port anymore , so try defaulting interface gig0/6 on sw2, then test again.

[MattSherman5680]

Hi,

I tried it and it didn't make a difference. 

Thanks,

Matt

[paul driver]

Hello

Can you also try specifying the ingress vlan

Sw2
monitor session 1 destination interface Gi0/6 ingress vlan 2

[MattSherman5680]

Hi,

I believe that the ingress setting just allows the capture host on that port to actually use the port for access at the same time.  I have tried that and still the same problem - only seeing broadcast/multicast as shown below:

[Matt Delony]

Hello MattSherman5680,

Is the capturing device capable of capturing traffic in promiscuous mode?