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Monitoring and Analyzing Switch Operation
Traffic Mirroring
To configure a MAC address to filter mirrored traffic on an interface, enter the
monitor mac mirror command at the global configuration level.
Syntax: [no] monitor mac <mac-addr> <src | dest | both> mirror < 1 - 4 | name-str >
[< 1 - 4 | name-str >] [< 1 - 4 | name-str >] [< 1 - 4 | name-str >]
Use this command to configure a source and/or destination MAC
address as criteria for selecting traffic in one or more mirroring
sessions on the switch. The MAC address you enter is configured
to mirror inbound (src), outbound (dest), or both inbound and
outbound (both) traffic on any port or learned VLAN on the
switch.
Packets that are sent or received on an interface configured with
a mirroring session and contain the MAC address as source and/
or destination address are mirrored to a previously configured
destination device.
To remove a MAC address as selection criteria in a mirroring
session, you must enter the complete command syntax; for
example, no monitor mac 998877-665544 dest mirror 4.
The no form of the command removes the MAC address as a
mirroring criteria from an active session, but does not remove
the session itself. This enables you to repurpose a a session by
removing an unwanted mirroring criteria and adding another
in its place.
monitor mac < mac-addr >: Configures the MAC address as selection
criteria for mirroring traffic on any port or learned VLAN on the
switch.
< src | dest | both >: Specifies how the MAC address is used to
filter and mirror packets in inbound and/or outbound
traffic on the interfaces on which the mirroring session is
applied:
src: Mirrors all packets in inbound traffic that contain the
specified MAC address as source address.
dest: Mirrors all packets in outbound traffic that contain the
specified MAC address as destination address.
Note: The MAC address of the switch is not supported as
either the source or destination MAC address used to select
mirrored traffic.
both: Mirrors all packets in both inbound and outbound
traffic that contain the specified MAC address as either
source or destination address.
mirror < 1 - 4 | < name-str >: Assigns the inbound and/or
outbound traffic filtered by the specified MAC address to a
previously configured mirroring session. The session is
identified by a number or (if configured) a name.
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