Concept Guide

• Source port (MD) can be a VLAN, where the VLAN trac received on that port pipe where its members are present is monitored
• Single MD can be monitored on max. of 4 MG ports.
Port Monitoring
Port monitoring is supported on both physical and logical interfaces, such as VLAN and port-channel interfaces. The source port (MD) with
monitored trac and the destination ports (MG) to which an analyzer can be attached must be on the same switch. You can congure up
to 128 source ports in a monitoring session. Only one destination port is supported in a monitoring session. The platform supports multiple
source-destination statements in a single monitor session.
The maximum number of source ports that can be supported in a session is 128.
The maximum number of destination ports that can be supported depends on the port mirroring directions as follows:
• 4 per port pipe, if the four destination ports mirror in one direction, either rx or tx.
• 2 per port pipe, if the two destination ports mirror in bidirection.
• 3 per port pipe, if one of the destination port mirrors bidirection and the other two ports mirror in one direction (either rx or tx).
In the following examples, ports 1/13, 1/14, 1/15, and 1/16 all belong to the same port-pipe. They are pointing to four dierent destinations
(1/1, 1/2, 1/3, and 1/37). Now it is not possible for another source port from the same port-pipe (for example, 1/17) to point to another new
destination (for example, 1/4). If you attempt to congure another destination (to create 5 MG port), this message displays: % Error
will be thrown in case of RPM and ERPM features.
In the following examples, ports Te 1/1/1, Te 1/1/2, Te 1/1/3, and Te 1/1/4 all belong to the same pipeline. They are pointing to four dierent
destinations: Te 1/4/1, Te 1/4/2, Te 1/4/3, and Te 1/4/4. If you attempt to congure another destination (to create 5 MG port), the system
displays an error message.
Example of Changing the Destination Port in a Monitoring Session
DellEMC(conf-mon-sess-5)#do show moni session
SessID Source Destination Dir Mode Source IP Dest IP DSCP TTL Drop Rate Gre-Protocol
FcMonitor
------ ------ ----------- --- ---- --------- -------- ---- ---- ---- -----
------------ ---------
100 Te 1/1/1 Te 1/4/1 rx Port N/A N/A N/A N/A No N/A N/A yes
200 Te 1/1/2 Te 1/4/2 tx Port N/A N/A N/A N/A No N/A N/A yes
300 Te 1/1/3 Te 1/4/3 rx Port N/A N/A N/A N/A No N/A N/A yes
400 Te 1/1/4 Te 1/4/4 rx Port N/A N/A N/A N/A No N/A N/A yes
DellEMC(conf-mon-sess-5)#
Example of Conguring Another Monitoring Session with a Previously Used Destination Port
DellEMC(conf)#mon ses 300
DellEMC(conf-mon-sess-300)#source TenGig 1/17/1 destination TenGig 1/4/1 direction tx
% Error: Exceeding max MG ports for this MD port pipe.
Example of Viewing a Monitoring Session
DellEMC#show running monitor session
!
monitor session 100
source TenGigabitEthernet 1/1/1 destination TenGigabitEthernet 1/4/1 direction rx
!
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 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
Port Monitoring
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