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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 TenGig 6/0 is an untagged member of any VLAN,
all monitored frames that the MG port TenGig 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.
Dell Networking OS Behavior: The switch continues to mirror outgoing traffic even after an MD
participating in spanning tree protocol (STP) transitions from the forwarding to blocking.
Configuring Port Monitoring
To configure port monitoring, use the following commands.
1. Verify that the intended monitoring port has no configuration other than no shutdown, as shown in
the following example.
EXEC Privilege mode
show interface
2. Create a monitoring session, as shown in the following example.
CONFIGURATION mode
monitor session
3. Specify the source and destination port and direction of traffic, as shown in the following example.
MONITOR SESSION mode
source
Example of Viewing Port Monitoring Configuration
To display monitor sessions, use the show monitor session command in EXEC Privilege mode.
Dell(conf-if-te-1/2)#show config
!
interface TengigabitEthernet 1/2
no ip address
no shutdown
Dell(conf-if-te-1/2)#exit
Dell(conf)#
monitor session 0
Dell(conf-mon-sess-0)#source tengig 1/1 dest tengig 1/2 direction rx
Dell(conf-mon-sess-0)#exit
Dell(conf)#do show monitor session 0
SessionID Source Destination Direction Mode Type
--------- ------ ----------- --------- ---- ----
0 Te 1/1 Te 1/2 rx interface Port-based
Dell(conf)#
In the example below, the host and server are exchanging traffic which passes through interface
tengigabitethernet 1/ 1. Interface tengigabitethernet 1/1 is the monitored port and tengigabitethernet 1/2
is the monitoring port, which is configured to only monitor traffic received on tengigabitethernet 1/1
(host-originated traffic).
688
Port Monitoring