How to Configure SPAN and RSPAN, Summary Steps

Configuring SPAN and RSPAN

How to Configure SPAN and RSPAN

RSPAN Configuration Guidelines

•All the SPAN configuration guidelines apply to RSPAN.

•As RSPAN VLANs have special properties, you should reserve a few VLANs across your network for use as RSPAN VLANs; do not assign access ports to these VLANs.

•You can apply an output ACL to RSPAN traffic to selectively filter or monitor specific packets. Specify these ACLs on the RSPAN VLAN in the RSPAN source switches.

•For RSPAN configuration, you can distribute the source ports and the destination ports across multiple switches in your network.

•Access ports (including voice VLAN ports) on the RSPAN VLAN are put in the inactive state.

•You can configure any VLAN as an RSPAN VLAN as long as these conditions are met:

◦The same RSPAN VLAN is used for an RSPAN session in all the switches.

◦All participating switches support RSPAN.

FSPAN and FRSPAN Configuration Guidelines

•When at least one FSPAN ACL is attached, FSPAN is enabled.

•When you attach at least one FSPAN ACL that is not empty to a SPAN session, and you have not attached one or more of the other FSPAN ACLs (for instance, you have attached an IPv4 ACL that is not empty, and have not attached IPv6 and MAC ACLs), FSPAN blocks the traffic that would have been filtered by the unattached ACLs. Therefore, this traffic is not monitored.