Users Guide

!
monitor session 200
source TenGigabitEthernet 1/1/2 destination TenGigabitEthernet 1/4/2 direction tx
!
monitor session 300
source TenGigabitEthernet 1/1/3 destination TenGigabitEthernet 1/4/3 direction rx
!
monitor session 400
source TenGigabitEthernet 1/1/4 destination TenGigabitEthernet 1/4/4 direction 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 TenGig 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
Port Monitoring 738