05-06-2013 08:36 AM - edited 03-07-2019 01:12 PM
Hello,
I have a RSPAN session configured between a Cisco 3750 and Cisco 2950 switches and I dont see the traffic I am expecting to see on the destination port. I only see broadcast traffic .. HRSP hellos etc. Below is what I have configured on both switches. What is not correct here?
3750 (gi1/0/33)----TRUNK------(fa0/47)2950(fa0/4)-----windows server
3750
---------
monitor session 1 source interface gi1/0/18
monitor session 1 destination remote vlan 901
3750#sh vlan id 901
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
901 RSPAN active Gi1/0/33, Gi2/0/34
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
901 enet 100901 1500 - - - - - 0 0
Remote SPAN VLAN
----------------
Enabled
Primary Secondary Type Ports
------- --------- ----------------- ------------------------------------------
interface GigabitEthernet1/0/33
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 11,20,50,80,102,104-106,108,109,901
switchport mode trunk
speed 100
duplex full
end
2950
-------
monitor session 1 destination interface Fa0/4
monitor session 1 source remote vlan 901
2950#sh vlan id 901
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
901 RSPAN active Fa0/4, Fa0/47, Fa0/48
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
901 enet 100901 1500 - - - - - 0 0
Remote SPAN VLAN
----------------
Enabled
Primary Secondary Type Ports
------- --------- ----------------- ------------------------------------------
interface FastEthernet0/47
switchport trunk allowed vlan 11,20,50,80,102,104-106,108,109,901
switchport mode trunk
no ip address
duplex full
speed 100
end
interface FastEthernet0/4
switchport access vlan 901
switchport mode access
no ip address
duplex full
speed 100
end
Thank you.
05-07-2013 05:25 AM
Hello,
on C2950 that is an older platform you need to configure a reflector port (first generation of remote span)
see
the refllector port cannot be used for other purposes
Hope to help
Giuseppe
05-08-2013 08:07 AM
Hello Giuseppe,
My RSPAN VLAN 901 is the RSPAN source on Cisco 2950. And I think I am not supposed to or cannot configure "reflector port" when RSPAN is source. My RSPAN VLAN is destination on Cisco 3750 which does not require a reflector port. So I dont have a way to configure reflector port in my case. Does this make any sense ?
Thank you.
05-09-2013 03:53 AM
Hello Network user,
you are right the reflector port is not needed in all cases as it is explained in the configuration chapter guide I have linked to my previous post.
I apologize for the misleading information.
The real problem with your configuration is that you have put the destination port in Vlan 901 !!!!
interface FastEthernet0/4
>>>>>switchport access vlan 901
switchport mode access
no ip address
duplex full
speed 100
end
This is wrong, the destination port doesn't need to be a member of RSPAN vlan
Hope to help
Giuseppe
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