Cisco Catalyst 2950 Command Reference Manual page 251

Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
If encapsulation type is not specified on a destination port, packets are sent in native form with no
encapsulation.
Ingress forwarding is disabled on SPAN destination ports.
Command Modes
Global configuration
Command History Release
12.1(6)EA1
12.1(11)EA1
12.1(13)EA1
Usage Guidelines
Traffic that enters or leaves source ports can be monitored by using SPAN or RSPAN. Traffic routed to
source ports cannot be monitored.
You can configure (and store in NVRAM) one local SPAN session or multiple RSPAN sessions on a
switch. The number of active sessions and combinations are subject to these restrictions:
•
•
•
•
You can monitor traffic on a single port or on a series or range of ports. You select a series or range of
interfaces by using the [, | -] options.
If you specify a series of interfaces, you must enter a space before and after the comma. If you specify
a range of interfaces, you must enter a space before and after the hyphen (-).
EtherChannel ports cannot be configured as SPAN or RSPAN destination or reflector ports. A physical
port that is a member of an EtherChannel group can be used as a source or destination port. It cannot
participate in the EtherChannel group while it is configured for SPAN or RSPAN.
A port used as a reflector port cannot be a SPAN or RSPAN source or destination port, nor can a port be
a reflector port for more than one session at a time.
A port used as a destination port cannot be a SPAN or RSPAN source or reflector port, nor can a port be
a destination port for more than one session at a time.
You can enable IEEE 802.1x authentication on a port that is an RSPAN destination port; however,
IEEE 802.1x authentication is disabled until the port is removed as a RSPAN destination. (If
IEEE 802.1x authentication is not available on the port, an error message is displayed.) You can enable
IEEE 802.1x authentication on a SPAN or RSPAN source port but not on a SPAN destination port.
OL-10102-01
Modification
This command was introduced.
These RSPAN keywords were added: encapsulation, destination remote
vlan reflector-port, source remote vlan, all, local, remote.
The ingress vlan keyword was added.
SPAN or RSPAN source (rx, tx, both): one active session limit. (SPAN and RSPAN are mutually
exclusive on a source switch).
RSPAN source sessions have one destination per session with an RSPAN VLAN associated for that
session.
Each RSPAN destination session has one or more destination interfaces for each RSPAN VLAN that
it supports.
RSPAN destination sessions are limited to two, or one if a local SPAN or a source RSPAN session
is configured on the same switch.
Catalyst 2950 and Catalyst 2955 Switch Command Reference
monitor session
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