Reference Guide

• A source port (MD) can only be monitored by one destination port (MG). If you try to assign a monitored port to more than one
monitoring port, the following message displays:
Dell(conf)#mon ses 1
Dell(conf-mon-sess-1)#source tengig 0/1 destination tengig 0/8 direction both
Dell(conf-mon-sess-1)#do show monitor session
SessionID Source Destination Direction Mode Type
--------- ------ ----------- --------- ---- ----
1 TenGig 0/1 TenGig 0/8 both interface Port-based
Dell(conf-mon-sess-1)#mon ses 2
Dell(conf-mon-sess-2)#source tengig 0/1 destination tengig 0/8 direction both
% Error: MD port is already being monitored.
NOTE: There is no limit to the number of monitoring sessions per system, provided that there are only four destination
ports per port-pipe. If each monitoring session has a unique destination port, the maximum number of session is four per
port-pipe.
Port Monitoring
The Aggregator supports multiple source-destination statements in a monitor session, but there may only be one destination port in a
monitoring session.
There may only be one destination port in a monitoring session (% Error: Only one MG port is allowed in a
session.
).
The number of source ports the Dell Networking OS allows within a port-pipe is equal to the number of physical ports in the port-
pipe (n). Multiple source ports may have up to four dierent destination ports (Exceeding max MG ports for this MD
port pipe.
).
In the following examples, ports 0/1, 0/2, 0/3, and 0/4 all belong to the same port-pipe. These ports mirror trac to four dierent
destinations (0/9, 0/10, 0/11, and 0/12).
Example of Number of Monitoring Ports
Dell#show mon session
SessionID Source Destination Direction Mode Type
--------- ------ ----------- --------- ---- ----
0 TenGig 0/1 TenGig 0/9 rx interface Port-based
10 TenGig 0/2 TenGig 0/10 rx interface Port-based
20 TenGig 0/3 TenGig 0/11 rx interface Port-based
30 TenGig 0/4 TenGig 0/12 rx interface Port-based
Dell(conf)#
A source port may only be monitored by one destination port, but a destination port may monitor more than one source port.
Dell Networking OS Behavior: All monitored frames are tagged if the congured monitoring direction is transmit (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 tengig 0/1 destination tengig 0/9 direction tx, if the source port 0/1 is an untagged member
of any VLAN, all monitored frames that the destination port 0/9 receives are tagged with the VLAN ID of the source port.
Port Monitoring
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