Concept Guide
• The L3 interface conguration 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.
• Reserved Vlan cannot have untagged ports
In the reserved L2 VLAN used for remote port mirroring:
• MAC address learning in the reserved VLAN is automatically disabled.
• The reserved VLAN for remote port mirroring can be automatically congured in intermediate switches by using GVRP.
• There is no restriction on the VLAN IDs used for the reserved remote-mirroring VLAN. Valid VLAN IDs are from 2 to 4094. The default
VLAN ID is not supported.
• In mirrored trac, packets that have the same destination MAC address as an intermediate or destination switch in the path used by
the reserved VLAN to transport the mirrored trac are dropped by the switch that receives the trac if the switch has a L3 VLAN
congured.
In a source session used for remote port mirroring:
• You can congure any port as a source port in a remote-port monitoring session with a maximum of three source ports per port pipe.
• Maximum number of source sessions supported on a switch: 3
When you congure remote port mirroring, you can create a maximum of 3 source RSPAN sessions with port mirroring direction as
either rx or tx. If you want to congure port mirroring for both directions (tx and rx), you can congure a maximum of 2 RSPAN
sessions with one monitor session for both directions and the other session with only one direction.
• Maximum number of source ports supported in a source session: 128
• You can congure physical ports and port-channels as sources in remote port mirroring and use them in the same source session. You
can use both Layer 2 (congured with the switchport command) and Layer 3 ports as source ports. You can optionally congure one or
more source VLANs to specify the VLAN trac to be mirrored on source ports.
• You can use the default VLAN and native VLANs as a source VLAN.
• You cannot congure the dedicated VLAN used to transport mirrored trac as a source VLAN.
• Egressing remote-vlan packets are rate limited to a default value of 100 Mbps. To change the mirroring rate, congure rate-limit within
the RPM session.
In a destination session used for remote port mirroring:
• Maximum number of destination sessions supported on a switch: 64
• Maximum number ports supported in a destination session: 64.
• You can congure any port as a destination port.
• You can congure additional destination ports in an active session.
• You can tunnel the mirrored trac from multiple remote-port source sessions to the same destination port.
• By default, destination port sends the mirror trac to the probe port by stripping o the rpm header. We can also congure the
destination port to send the mirror trac with the rpm header intact in the original mirror trac..
• By default, ingress trac on a destination port is dropped.
Restrictions
When you congure remote port mirroring, the following restrictions apply:
• You can congure the same source port to be used in multiple source sessions.
• You cannot congure a source port channel or source VLAN in a source session if the port channel or VLAN has a member port that is
congured as a destination port in a remote-port mirroring session.
• A destination port for remote port mirroring cannot be used as a source port, including the session in which the port functions as the
destination port.
Port Monitoring
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