Users Guide

The reserved VLANs transport the mirrored traffic in sessions (blue pipes) to the destination analyzers in the local network. Two
destination sessions are shown: one for the reserved VLAN that transports orange-circle traffic; one for the reserved VLAN that
transports green-circle traffic.
Figure 101. Remote Port Mirroring
Configuring Remote Port Mirroring
Remote port mirroring requires a source session (monitored ports on different source switches), a reserved tagged VLAN for
transporting mirrored traffic (configured on source, intermediate, and destination switches), and a destination session
(destination ports connected to analyzers on destination switches).
Configuration Notes
When 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
intermediate transport session for a reserved VLAN at the same time for multiple remote-port mirroring sessions. You can
enable and disable individual 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
they are copied to the reserve VLAN.
• Mirrored traffic is transported across the network using 802.1Q-in-802.1Q tunneling. The source address, destination
address and original VLAN ID of the mirrored packet are preserved with the tagged VLAN header. Untagged source packets
are tagged with the 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.
Port Monitoring 656