C
HAPTER
29
| Port Mirroring Commands
RSPAN Mirroring Commands
– 730 –
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.
◆ 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 two mirror sessions are allowed. Both sessions can be allocated to
remote mirroring, unless local mirroring is enabled (which is limited to
a single session).
◆ 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
no rspan session Deletes a configured RSPAN session GC
show rspan Displays the configuration settings for an RSPAN
session
PE
Table 95: RSPAN Commands (Continued)
Command Function Mode
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