User's Manual

70-2
For chassis switches, at most 4 mirror destination ports are supported, and source or destination port of one
mirror session can be configured on each line card. For box switches, only one mirror session can be
configured. The number of the source mirror ports is not limited, and can be one or more. Multiple source
ports are not restricted to be in the same VLAN. The destination port and the source ports can be in different
VLAN.
For configuration of RSPAN, a dedicated RSPAN VLAN should be configured first for carrying the RSPAN
datagrams. The default VLAN, dynamic VLAN, private VLAN, multicast VLAN, and the layer 3 interface
enabled VLAN cannot be configured as the RSPAN VLAN. The reflector port must belong to the RSPAN
VLAN. The destination port should be connected to the Monitor and the configured as access port or the
TRUNK port. The RSPAN reflector port will be working dedicatedly for mirroring, when a port is configured as
a reflector port, it will discards all the existing connections to the remote peer, disable configurations related to
loopback interfaces, and stop forwarding datagram. Connectivity between the source and destination switch
for Remote VLAN, should be made sure by configuration.
To be noticed:
1. Layer 3 interfaces related to RSPAN VLAN should not be configured on the source, intermediate, and
the destination switches, or the mirrored datagrams may be discarded.
2. For the source and intermediate switches in the RSPAN connections, the native VLAN of TRUNK port
cannot be configured as the RSPAN VLAN, Otherwise the RSPAN tag will be disposed before reaching
the destination switches.
3. The source port, in access or trunk mode, should not be added to RSPAN VLAN if advanced RSPAN
mode is chosen. When the reflector port is used for an inter-card mirroring of CPU TX data, it must be
configured as TRUNK port and allows the RSPAN VLAN data passing, the Native VLAN should not be
configured as RSPAN VLAN.
4. When configuring the remote mirroring function, the network bandwidth should be considered in order
to carry the network flow and the mirrored flow.
Keywords:
RSPAN: Remote Switched Port Analyzer
RSPAN VLAN: Dedicated VLAN for RSPAN
RSPAN Tag: The VLAN tag which is attached to MTP of the RSPAN datagrams.
Reflector Port: The local mirroring port between the RSPAN source and destination ports, which is not
directly connected to the intermediate switches.
70.2 RSPAN Configuration Task List
1. Configure RSPAN VLAN
2. Configure mirror source port
3. Configure mirror destination port
4. Configure reflector port
5. Configure remote VLAN of mirror group