Figure 107. Remote Port MirroringConfiguring Remote Port MirroringRemote port mirroring requires a source session (monitored ports on different source switches), a reserved tagged VLAN fortransporting mirrored traffic (configured on source, intermediate, and destination switches), and a destination session (destinationports connected to analyzers on destination switches).Configuration NotesWhen you configure remote port mirroring, the following conditions apply:• You can configure any switch in the network with source ports and destination ports, and allow it to function in an intermediatetransport session for a reserved VLAN at the same time for multiple remote-port mirroring sessions. You can enable and disableindividual mirroring sessions.• BPDU monitoring is not required to use remote port mirroring.• A remote port mirroring session mirrors monitored traffic by prefixing the reserved VLAN tag to monitored packets so that theyare copied to the reserve VLAN.• Mirrored traffic is transported across the network using 802.1Q-in-802.1Q tunneling. The source address, destination address andoriginal VLAN ID of the mirrored packet are preserved with the tagged VLAN header. Untagged source packets are tagged withthe reserve VLAN ID.• You cannot configure a private VLAN or a GVRP VLAN as the reserved RPM VLAN.• The RPM VLAN can’t be a Private VLAN.• The RPM VLAN can be used as GVRP VLAN.• The L3 interface configuration should be blocked for RPM VLAN.• The member port of the reserved VLAN should have MTU and IPMTU value as MAX+4 (to hold the VLAN tag parameter).• To associate with source session, the reserved VLAN can have at max of only 4 member ports.• To associate with destination session, the reserved VLAN can have multiple member ports.650 Port Monitoring
