Reference Guide
rx
!
Dell Networking OS Behavior: All monitored frames are tagged if the configured monitoring direction is
egress (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 TeGig
1/6/1 destination TeGig 1/6/2 direction tx, if the MD port TenGig 1/6/1 is an untagged member of any
VLAN, all monitored frames that the MG port TeGig 1/6/2 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 platform 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 using the command monitor session from CONFIGURATION mode, as
shown in the following example.
CONFIGURATION mode
monitor session
monitor session type rpm/erpm
type is an optional keyword, required only for rpm and erpm
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 information on currently configured port-monitoring sessions, use the show monitor
session
command from EXEC Privilege mode.
Dell(conf)#monitor session 0
Dell(conf-mon-sess-0)#$source ten 1/1/1 dest ten 1/2/1 dir rx
Dell(conf-mon-sess-0)#show c
!
monitor session 0
source TenGigabitEthernet 1/1/1 destination TenGigabitEthernet 1/2/1 direction
rx
Dell(conf-mon-sess-0)#
Dell(conf-mon-sess-0)#do show monitor session
SessID Source Destination Dir Mode Source IP Dest IP
------ ------ ------------ --- ---- --------- --------
0 Te 1/1/1 Te 1/2/1 rx Port N/A N/A
660
Port Monitoring