Configure Port Mirroring

Language:

Assign the mirroring source interface.
Enables packet forwarding for this interface.
```
SEFOS-01# configure terminal
SEFOS-01(config)# monitor session 1 source interface extreme-ethernet 0/1 both
SEFOS-01(config)# end
```
Note - The command allows to mirror either rx/tx or both packets. In this case we enable both ingress and egress packets to be forwarded.

Assign the mirroring destination interfaces.
These are the interfaces to which packets are forwarded.
```
SEFOS-01# configure terminal
SEFOS-01(config)# monitor session 1 destination interface extreme-ethernet 0/3 secondary interface extreme-ethernet 0/4 vlan 100
SEFOS-1 (config)# end
```
Note - The use of the secondary interface is optional. You could use monitor session 1 destination interface Ex 0/3, and Ex 0/3 would be the only destination interface.

Note - A maximum of three secondary destination interfaces are allowed per session.

Note - You must assign a VLAN when you configure a secondary interface.

Disable spanning tree on the primary destination interface.

Note - This is only required when you configure a secondary destination interface.

SEFOS-1 # configure terminal
SEFOS-1 (config) # interface extreme-ethernet 0/3
SEFOS-1 (config-if) # spanning-tree disable
SEFOS-1 (config)# end

(Optional)Create multiple sessions (maximum 4).

SEFOS-1 # configure terminal
SEFOS-1 (config) # monitor session 2 destination interface extreme-ethernet 0/10
SEFOS-1 (config) # monitor session 2 source interface extreme-ethernet 0/12 rx
SEFOS-1 (config)# end

Source or destination ports of one session cannot be used in another session.