Administrator Guide

N/A No N/A N/A No
300 Gi 1/17 Gi 1/4 tx Port N/A N/A N/A
N/A No N/A N/A No
DellEMC(conf-mon-sess-300)#
Example of Viewing a Monitoring Session
In the example below, 0/25 and 0/26 belong to Port-pipe 1. This port-pipe has the same restriction of only four destination ports, new or
used.
DellEMC(conf-mon-sess-300)#do show mon session
SessID Source Destination Dir Mode Source IP Dest IP DSCP TTL Drop
Rate Gre-Protocol FcMonitor
------ ------ ----------- --- ---- --------- -------- ---- --- ----
---- ----------- ---------
0 Gi 1/13 Gi 2/1 rx interface N/A N/A 0 0 No
N/A N/A yes
10 Gi 1/14 Gi 2/2 rx interface N/A N/A 0 0 No
N/A N/A yes
20 Gi 1/15 Gi 2/3 rx interface N/A N/A 0 0 No
N/A N/A yes
30 Gi 1/16 Gi 2/4 rx interface N/A N/A 0 0 No
N/A N/A yes
100 Gi 1/25 Gi 2/5 tx interface N/A N/A 0 0 No
N/A N/A yes
110 Gi 1/26 Gi 2/5 tx interface N/A N/A 0 0 No
N/A N/A yes
300 Gi 1/17 Gi 2/5 tx interface N/A N/A 0 0 No
N/A N/A yes
DellEMC(conf-mon-sess-5)#
Given these parameters, the following illustration shows the possible port monitoring configurations.
Figure 93. Port Monitoring Configurations
Dell EMC 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 Gig 6/1 destination
Gig 6/2 direction tx, if the MD port Gig 6/1 is an untagged member of any VLAN, all monitored frames that the MG port Gig 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 EMC 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.
590
Port Monitoring