388 | Port Monitoring
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Configuring Port Monitoring
To configure port monitoring, use the following example:
FTOS Behavior: All monitored frames are tagged if the configured monitoring direction is transmit
(TX), regardless of whether the monitored port (MD) is a Layer 2 or Layer 3 port.
If the MD port is a Layer 2 port, the frames are tagged with the VLAN ID of the VLAN to which the MD
belongs.
If the MD port is a Layer 3 port, the frames are tagged with VLAN ID 4095.
If the MD port is in a Layer 3 VLAN, the frames are tagged with the respective Layer 3 VLAN ID.
For example, in the configuration source tengig 6/0 destination tengig 6/1 direction tx, if the MD port
tengigabitethernet 6/0 is an untagged member of any VLAN, all monitored frames that the MG port
tengigabitethernet 6/1 receives are tagged with the VLAN ID of the MD port. Similarly, if BPDUs are
transmitted, the MG port receives them tagged with the VLAN ID 4095. This behavior might result in a
difference between the number of egress packets on the MD port and monitored packets on the MG
port.
FTOS Behavior: The MXL 10/40GbE Switch continues to mirror outgoing traffic even after an MD
participating in Spanning Tree Protocol (STP) transitions from the forwarding to blocking.
Step Task Command Syntax Command Mode
1 Verify that the intended monitoring port has no
configuration other than no shutdown (Figure 21-4).
show interface
EXEC Privilege
2 Create a monitoring session using the command monitor
session from CONFIGURATION mode (Figure 21-4).
monitor session
CONFIGURATION
3 Specify the source and destination port and direction of
traffic (Figure 21-4).
source
MONITOR SESSION
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