Concept Guide

• There may only be one destination port in a monitoring session.
• 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 0/9 direction both gre-protocol 111
Dell(conf-mon-sess-1)#do show monitor session
SessionID Source Destination Dir Mode Source IP Dest IP DSCP TTL Drop Rate Gre-
Protocol FcMonitor Status
--------- ------ ----------- ---- ---- --------- -------- ---- --- ---- ----
------------ --------- ------
1 Te 0/1 Te 0/9 both interface 1.1.1.1 7.1.1.2 0 255 No 100
111 No Enabled
Dell(conf-mon-sess-1)#mon ses 2
Dell(conf-mon-sess-2)#source tengig 0/1 destination tengig 0/9 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.
Remote Port Mirroring
Remote Port Mirroring is supported on the FN IOM Switch platform.
While local port monitoring allows you to monitor trac from one or more source ports by directing it to a destination port on the same
switch/router, remote port mirroring allows you to monitor Layer 2 and Layer 3 ingress or egress or both ingressing or egressing trac on
Port Monitoring
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