Monitoring and Analyzing Switch Operation

Traffic Mirroring

VLAN Interface with Traffic Direction as the Selection Criteria

Use the following command to select all traffic on a VLAN interface for mirroring according to traffic direction (inbound and/or outbound):

Syntax: vlan < vid-#> monitor all < in out both > mirror < 1 - 4 name-str> [< 1 - 4 name-str> < 1 - 4 name-str> < 1 - 4 name-str>]

This command assigns a monitored VLAN source to a previously configured mirroring session on a source switch by specifying the VLAN ID, the direction of traffic to mirror, and the session. Assigning a VLAN to a mirroring session precludes assigning any other mirroring sources to the same session. If a VLAN is already assigned to a given mirroring session, using this command to assign another VLAN to the same mirroring session results in the second assignment replacing the first. Also, if there are other (port, trunk, or mesh) mirroring sources already assigned to a session, the switch displays a message similar to:

Mirror source port exists on session N. Can not add mirror source VLAN.

The no form of the command removes a mirroring source assigned to the session, but does not remove the session itself. This allows you to repurpose a session by removing an unwanted mirroring source and adding another in its place.

vlan < vid-#>: Identifies the VLAN on which to mirror traffic.

monitor all < in out both >: Uses the direction of traffic on the specified vid-# to select traffic to mirror. Refer to the syntax description on page B-57.(If you enter the monitor all command without selection criteria or a session identifier, the command applies by default to session 1; see “Monitor Command” on page B-96.)

mirror < 1 - 4 < name-str>: Assigns the VLAN traffic defined by the VlAN ID and traffic direction to a session number or name. (The session must have been previously configured as described in “3. Configure a Mirroring Session on the Source Switch” on page B-52.)Depending on how many sessions are already configured on the switch, you can use the same command to assign the specified VLAN source to up to four sessions; for example, interface a1 monitor all in mirror 1 2 4. For limits on configuring mirroring sources in

asession, refer to “Mirroring-Source Restrictions” on page B-56.

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