Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide - Manual (Page 249)

VLAN-based mirroring behavior: Tagged versus untagged ports (Continued) TABLE 42
Ingress tag type Egress tag type VLAN-based mirroring direction Mirrored traffic tag type
Untagged Tagged Ingress Untagged
Untagged Tagged Egress Tagged
Tagged Untagged Ingress Tagged
Tagged Untagged Egress Tagged
Tagged Tagged Ingress Tagged
Tagged Tagged Egress Tagged
As illustrated in the above table, regardless of the egress port tag type, if a VLAN is egress mirrored,
the mirrored traffic is always tagged. This functionality is built into the hardware and is the expected
behavior, as the tag acts as an identifier for monitored traffic on the mirror-port (in case the mirror-port
belongs to some other VLAN).
Configuring VLAN-based mirroring
Configure VLAN-based mirroring using the monitor ethernet command in VLAN configuration mode.
For example, to enable incoming mirroring on VLANs 10 and 20, to mirror port e 6/24, enter the
following commands.
device(config)#mirror-port ethernet 6/24
device(config)#vlan 10
device(config-VLAN-10)#monitor ethernet 6/24 input
device(config-VLAN-10)#exit
device(config)#vlan 20
device(config-VLAN-20)#monitor ethernet 6/24 input
device(config-VLAN-20)#end
For example, to enable outgoing mirroring on VLANs 10 and 20, to mirror port e 6/24, enter the
following commands.
device(config)#mirror-port ethernet 6/24
device(config)#vlan 10
device(config-VLAN-10)#monitor ethernet 6/24 output
device(config-VLAN-10)#exit
device(config)#vlan 20
device(config-VLAN-20)#monitor ethernet 6/24 output
device(config-VLAN-20)#end
For example, to enable bidirectional mirroring on VLANs 10 and 20, to mirror port e 6/24, enter the
following commands.
device(config)#mirror-port ethernet 6/24
device(config)#vlan 10
device(config-VLAN-10)#monitor ethernet 6/24 both
device(config-VLAN-10)#exit
device(config)#vlan 20
device(config-VLAN-20)#monitor ethernet 6/24 both
device(config-VLAN-20)#end
To disable mirroring on VLAN 20, enter the following commands.
device(config)#vlan 20
device(config-VLAN-20)#no monitor ethernet 6/24
device(config-VLAN-20)#end
Configuring VLAN-based mirroring
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