Ok, I'm stumpped. I'm trying to get RSPAN going between my 4500s. I used to have it working, replaced my 4500 cores with Nexus 5500, which don't support RSPAN.
I have a "Backup" type of a network to a secondary server room in my building, the core of that is a 4507R. So basicaly, I have 5 floors, each connected to my two Nexus cores via a L2 trunk. Also, each of the 5 floors is connecting to a 4507 via L2 links as well.
I've created RSPAN vlan 900 on the 4507R, which it propogated via VTP to my floor switches as well as my nexus switches. I have blocked vlan 900 on the uplinks to my Nexus switches, and made the 4507R the Spanning-tree root for vlan 900. I also verified that VTP Pruning is disabled, Nexus 5500 dont support it and 4500s show it as disabled. So really, RSPAN should only work across the backup links.
On my RSPAN destination port, I am only seeing broadcast and multicast traffic that would be on the remote port. My PC is connected to port gi6/46 on 4th floor switch. It's really strange. I don't see any unicast traffic. I've tried this from both 2nd and 3rd floor switches and i'm seeing traffic from the respective VLANs. Same results. I'm wondering if the Nexus switches, not supporting RSPAN, could be causing this behaviour? Here's some outputs that would hopefully shed some light on my setup.
My floor switches are 4506 (Sup-II+), IP Base.
(cat4500-IPBASEK9-M), Version 12.2(53)SG1
4507R (Sup-IV) switch IOS:
(cat4500-ENTSERVICESK9-M)
I've configured an RSPAN session from 3rd floor to 4th floor:
3rd floor:
HQ_3rdFlr_4506#sh vlan remote-span
Remote SPAN VLANs
------------------------------------------------------------------------------
900
HQ_3rdFlr_4506#sh monitor
Session 1
---------
Type : Remote Source Session
Source Ports :
Both : Fa2/15
Filter Pkt Type :
RX Only : Good
Dest RSPAN VLAN : 900
4th floor:
HQ_4thFlr_4506#sh vlan remote-span
Remote SPAN VLANs
------------------------------------------------------------------------------
900
HQ_4thFlr_4506(config-if)#do sh monitor
Session 1
---------
Type : Remote Destination Session
Source RSPAN VLAN : 900
Destination Ports : Gi6/46
Encapsulation : Native
Ingress : Disabled
Learning : Disabled
Filter Pkt Type :
RX Only : Good
4507R:
HQ_1st_SrvRm_4507#sh vlan remote-span
Remote SPAN VLANs
------------------------------------------------------------------------------
900
HQ_1st_SrvRm_4507#sh spann
HQ_1st_SrvRm_4507#sh spanning-tree vlan 900
VLAN0900
Spanning tree enabled protocol rstp
Root ID Priority 25476
Address 0013.c317.0940
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 25476 (priority 24576 sys-id-ext 900)
Address 0013.c317.0940
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi3/48 Desg FWD 4 128.304 P2p
Gi5/4 Desg FWD 4 128.516 P2p Peer(STP)
Gi5/5 Desg FWD 4 128.517 P2p Peer(STP)
Gi5/6 Desg FWD 4 128.518 P2p
Gi6/2 Desg FWD 19 128.642 P2p Peer(STP)
Gi6/3 Desg FWD 19 128.643 P2p Peer(STP)
I guess next step would be to put like my 4507R and my floor switches into VTP transparent and create a different RSPAN vlan and see if it works.
