Cisco Catalyst 4500 Series Command Reference Manual page 541

Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
Command History Release
12.1(8a)EW
12.1(11b)EW
12.1(19)EW
12.1(20)EW
12.2(20)EW
12.2(40)SG
Usage Guidelines Only one SPAN destination for a SPAN session is supported. If you attempt to add another destination
interface to a session that already has a destination interface that is configured, you will get an error. You
must first remove a SPAN destination interface before changing the SPAN destination to a different
interface.
Beginning in Cisco IOS Release 12.1(12c)EW, you can configure sources from different directions
within a single user session.
Note
A particular SPAN session can either monitor VLANs or monitor individual interfaces: you cannot have
a SPAN session that monitors both specific interfaces and specific VLANs. If you first configure a SPAN
session with a source interface, and then try to add a source VLAN to the same SPAN session, you will
receive an error. You will also receive an error message if you configure a SPAN session with a source
VLAN, and then try to add a source interface to that session. You must first clear any sources for a SPAN
session before switching to another type of source. CPU sources may be combined with source interfaces
and source VLANs.
When configuring the ingress option on a destination port, you must specify an ingress VLAN if the
configured encapsulation type is untagged (the default) or is 802.1Q. If the encapsulation type is ISL,
then no ingress VLAN specification is necessary.
By default, when you enable ingress, no host learning is performed on destination ports. When you enter
the learning keyword, host learning is performed on the destination port, and traffic to learned hosts is
forwarded out the destination port.
If you enter the filter keyword on a monitored trunking interface, only traffic on the set of specified
VLANs is monitored. Port-channel interfaces are displayed in the list of interface options if you have
them configured. VLAN interfaces are not supported. However, you can span a particular VLAN by
entering the monitor session session source vlan vlan-id command.
The packet-type filters are supported only in the Rx direction. You can specify both Rx- and Tx-type
filters and multiple-type filters at the same time (for example, you can use good and unicast to only sniff
nonerror unicast frames). As with VLAN filters, if you do not specify the type, the session will sniff all
packet types.
OL-27596 -01
Modification
Support for this command was introduced on the Catalyst 4500 series switch.
Support for differing directions within a single-user session and extended VLAN
addressing was added.
Support for ingress packets, encapsulation specification, packet and address type
filtering, and CPU source sniffing enhancements was added.
Support for remote SPAN and host learning on ingress-enabled destination ports
was added.
Support for an IP access group filter was added.
Support for Supervisor Engine 6-E and Catlyst 4900M chassis CPU queue options
were added.
Beginning in Cisco IOS Release 12.1(12c)EW, SPAN is limited to two sessions containing
ingress sources and four sessions containing egress sources. Bidirectional sources support both
ingress and egress sources.
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
monitor session
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