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Concept Guide

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multiple source ports on dierent switches and forward the mirrored trac to multiple destination ports on dierent switches. Remote port
mirroring helps network administrators monitor and analyze trac to troubleshoot network problems in a time-saving and ecient way.
In a remote-port mirroring session, monitored trac is tagged with a VLAN ID and switched on a user-dened, non-routable L2 VLAN. The
VLAN is reserved in the network to carry only mirrored trac, which is forwarded on all egress ports of the VLAN. Each intermediate
switch that participates in the transport of mirrored trac must be congured with the reserved L2 VLAN. Remote port monitoring
supports mirroring sessions in which multiple source and destination ports are distributed across multiple switches
Remote Port Mirroring Example
Remote port mirroring uses the analyzers shown in the aggregation network in Site A.
The VLAN trac on monitored links from the access network is tagged and assigned to a dedicated L2 VLAN. Monitored links are
congured in two source sessions shown with orange and green circles. Each source session uses a separate reserved VLAN to transmit
mirrored packets (mirrored source-session trac is shown with an orange or green circle with a blue border).
The reserved VLANs transport the mirrored trac 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 trac; one for the reserved VLAN that transports green-
circle trac.
Figure 95. Remote Port Mirroring Example
Conguring Remote Port Mirroring
Remote port mirroring requires a source session (monitored ports on dierent source switches), a reserved tagged VLAN for transporting
mirrored trac (congured on source, intermediate, and destination switches), and a destination session (destination ports connected to
analyzers on destination switches).
Conguration Notes
When you congure remote port mirroring, the following conditions apply:
• You can congure 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.
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Port Monitoring