Configure Port Mirroring

1. 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

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   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.

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2. 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

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   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.

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

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

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3. Disable spanning tree on the primary destination interface.

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

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

4. (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.