RSPAN

[usskenet]

Guys,

I am trying to create RSPAN on Catalyst 2950 and I am not sure what does it mean reflector port??

I followed

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2950/software/release/12-1_19_ea1/configuration/guide/2950scg/swspan.html#wp1081130

and it doesnt work.  

I am not sure what does it mean Reflector port is a port set to loopback.

Please help.

Thanks!

[John Blakley]

First, do you need an rspan port? If you're only working with a single switch, chances are a regular span session will be fine.

A reflector port is the port that copies data to the rspan vlan that you have configured.

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2950/software/release/12-1_19_ea1/configuration/guide/2950scg/swspan.html#wp1073435

HTH,

John

[usskenet]

Unfortunately, yes I do. Because Catalyst 2950 that I mentioned is source switch and destination switch is another one.

I configured RSPAN following link which you posted but it doesnt work. I am not understand Reflector port is a port set to loopback. What does it mean? How to configure interface fastethernet on Catalyst 2950 to loopback???

Thanks!

[John Blakley]

Post the config of your monitor session and the vlan that you created for rspan....

[usskenet]

Source switch Catalyst 2950:

monitor session 1 source interface Fa0/8
monitor session 1 destination remote vlan 999 reflector-port Fa0/11

interface FastEthernet0/11
 switchport access vlan 999

Fa0/11                       monitoring   999        a-full  a-100 10/100BaseTX

Destination switch Catalyst 2960:

monitor session 1 destination interface Fa0/23
monitor session 1 source remote vlan 999

[usskenet]

Of course:

I have created remote vlan on distribution switch :

vlan 999

remote-span

[John Blakley]

The remote span vlan needs to be created on the 2950 as well. Do you have it configured on both switches? When you use the reflector port option (which some switches need), it puts the port in loopback mode which means that it can't be used for traffic any longer.

If you have these two switches connected, you'll need to allow vlan 999 over the trunk like any other vlan that needs to traverse switches. You generally don't need to put the reflector port into the vlan that you've configured for rspan. So I don't think f0/11 needs to be an access port on vlan 999.

HTH,

John

[usskenet]

Yes, vlan 999 was distributed to both switches through VTP.

What does it mean put the port in loopback mode? Some special command?

[John Blakley]

The message that you're getting is the switch telling you that the port you've specified as a reflector port is in loopback mode meaning that you cannot use it for normal traffic. It's just letting you know that it's in monitor mode.

As far as vtp, it will distribute the vlan for you, but it will not configure the vlan on the vtp client as a remote vlan. You'll still need to get on the 2950 and configure that vlan as a remote-vlan I believe.