Manual

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Москва, Новозаводская ул., 18, стр. 1
425
order not to forward RSPAN datagrams to external networks. The normal mode has the
benefit of easy configuration, and reduced system resources.
To be noticed: Normal mode is introduced by default. When using the normal mode,
datagrams with reserved MAC addresses cannot be broadcasted.
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 a 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.
Keywards:
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.