Chapter 14
| Port Mirroring Commands
RSPAN Mirroring Commands
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Configuration Guidelines
Take the following steps to configure an RSPAN session:
1. Use the vlan rspan command to configure a VLAN to use for RSPAN. (Default
VLAN 1 and switch cluster VLAN 4093 are prohibited.)
2. Use the rspan source command to specify the interfaces and the traffic type
(RX, TX or both) to be monitored.
3. Use the rspan destination command to specify the destination port for the
traffic mirrored by an RSPAN session.
4. Use the rspan remote vlan command to specify the VLAN to be used for an
RSPAN session, to specify the switch’s role as a source, intermediate relay, or
destination of the mirrored traffic, and to configure the uplink ports designated
to carry this traffic.
RSPAN Limitations
The following limitations apply to the use of RSPAN on this switch:
◆ RSPAN Ports – Only ports can be configured as an RSPAN source, destination, or
uplink; static and dynamic trunks are not allowed. A port can only be
configured as one type of RSPAN interface – source, destination, or uplink. Also,
note that the source port and destination port cannot be configured on the
same switch.
Only 802.1Q trunk or hybrid (i.e., general use) ports can be configured as an
RSPAN uplink or destination port – access ports are not allowed (see switchport
mode).
◆ Local/Remote Mirror – The destination of a local mirror session (created with the
port monitor command) cannot be used as the destination for RSPAN traffic.
Only one mirror session is allowed, including both local and remote mirroring.
If local mirroring is enabled, then no session can be configured for RSPAN.
◆ Spanning Tree – If the spanning tree is disabled, BPDUs will not be flooded onto
the RSPAN VLAN.
MAC address learning is not supported on RSPAN uplink ports when RSPAN is
enabled on the switch. Therefore, even if spanning tree is enabled after RSPAN
has been configured, MAC address learning will still not be re-started on the
RSPAN uplink ports.
◆ IEEE 802.1X – RSPAN and 802.1X are mutually exclusive functions. When 802.1X
is enabled globally, RSPAN uplink ports cannot be configured, even though
RSPAN source and destination ports can still be configured. When RSPAN uplink
ports are enabled on the switch, 802.1X cannot be enabled globally.
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