Cisco Catalyst 3550

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Catalyst 3550 Multilayer Switch Command Reference
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Chapter 2 Catalyst 3550 Switch Cisco IOS Commands
monitor session
Defaults On a source interface, the default is to monitor both received and transmitted traffic. On source VLANs,
you can monitor only received traffic.
All VLANs are monitored on a trunk interface that is used as a source port.
If encapsulation type is not specified on a destination port, packets are sent in native form with no
encapsulation.
Ingress forwarding is disabled on destination ports.
Command Modes Global configuration
Command History
Usage Guidelines Traffic that enters or leaves source ports or enters source VLANs can be monitored by using SPAN or
RSPAN. Traffic routed to source ports or source VLANs cannot be monitored.
You can set a maximum of two SPAN or RSPAN sessions. You can divide the two sessions between
SPAN, RSPAN source, and RSPAN destination sessions. Each session can have only one destination
port and only one transmitting source port. You can, however, have multiple receiving source ports and
VLANs.
, (Optional) Specify a series of interfaces or VLANs, or separate a range of
interfaces or VLANs from a previous range. Enter a space after the comma.
Note For source interface, you can configure the first port to monitor
egress traffic; other ports will be ingress only if a range or list is
specified.
- (Optional) Specify a range of interfaces or VLANs. Enter a space before
and after the hyphen.
Note For source interface, you can configure the first port to monitor
egress traffic; other ports will be ingress only if a range or list is
specified.
both, rx, tx (Optional) Specify the traffic direction to monitor. If you do not specify a
traffic direction, the source interface sends both transmitted and received
traffic. Transmitted (tx) traffic can be monitored on only one source port.
source remote vlan
vlan-id
Specify the source RSPAN VLAN for an RSPAN destination session.
source vlan vlan-id rx Specify the SPAN or RSPAN source interface as a VLAN ID. The range is
1 to 4094.
VLANs cannot be egress monitored. Direction (rx) must be specified.
all, local, remote Specify all, local, or remote to clear a SPAN or RSPAN session.
Release Modification
12.1(6)EA1 This command was introduced.
12.1(11)EA1 These RSPAN keywords were added: destination remote vlan
reflector-port, source remote vlan, all, local, remote.
12.1(12c)EA1 The ingress vlan keyword was added.