Concept Guide

DellEMC(conf-mon-sess-300)#
DellEMC(conf-mon-sess-300)#do show monitor session
SessID Source Destination Dir Mode Source IP Dest IP DSCP
TTL Drop Rate Gre-Protocol FcMonitor
------ ------ ----------- --- ---- --------- -------- ----
--- ---- ---- ----------- ------
0 Te 1/50 Te 1/51 rx Port N/A N/A N/A N/
A No N/A N/A yes
1 Gi 1/45 Gi 1/46 tx Port N/A N/A N/A N/
A No N/A N/A yes
2 NONE NONE N/A N/A N/A N/A N/A 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 congurations.
Figure 92. Port Monitoring Congurations
Dell EMC Networking OS Behavior: All monitored frames are tagged if the congured 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 conguration 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 dierence between the number of egress packets on the MD port and monitored packets on the MG port.
642
Port Monitoring