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Figure 106. Port Monitoring Configurations
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.
Important Points to Remember
● Port monitoring is supported on physical ports only; virtual local area network (VLAN) and port-channel interfaces do not
support port monitoring.
● The monitored (the source, [MD]) and monitoring ports (the destination, [MG]) must be on the same switch.
● You can configure any port as a source port in a local port-monitoring session with a maximum of four source ports per port
pipe. Only one destination port is supported in a port-monitoring session.
● In general, a monitoring port should have no ip address and no shutdown as the only configuration; the system permits a
limited set of commands for monitoring ports. You can display these commands using the ? command. A monitoring port also
may not be a member of a VLAN.
● There may only be one destination port in a monitoring session.
● Only one destination port (MG) can monitor a source port (MD). If you try to assign a monitored port to more than one
monitoring port, the following message displays:
DellEMC(conf)#mon ses 1
DellEMC(conf-mon-sess-1)#$tengig 0/0 destination tengig 0/60 direction both gre-
protocol 139
DellEMC(conf-mon-sess-1)#do show mon ses
SessionID Source Destination Dir Mode Source IP Dest IP DSCP TTL Drop
Rate Gre-Protocol FcMonitor Status
--------- ------ ----------- --- ---- --------- -------- ---- --- ----
---- ------------ --------- -------
1 Te 0/0 Te 0/60 both interface 1.1.1.1 7.1.1.2 0 255 No
100 139 No Enabled
DellEMC(conf-mon-sess-1)#mon ses 2
DellEMC(conf-mon-sess-2)#source twentyFiveGigE 0/0 destination twentyFiveGigE 0/47
direction both
% Error: MD port is already being monitored.
● If each port monitoring session has a unique destination port, up to two port monitoring sessions are supported. If the
destination port is the same, up to four port monitoring sessions are supported.
● Port Monitoring is supported on both physical and logical interfaces like virtual area network (VLAN) and port-channel.
● The monitored (the source, [MD]) and monitoring ports (the destination, [MG]) must be on the same switch.
● In general, a monitoring port should have no ip address and no shutdown as the only configuration; Dell EMC Networking
OS permits a limited set of commands for monitoring ports. You can display these commands using the ? command. A
monitoring port also may not be a member of a VLAN.
● There may only be one destination port (MG) in a monitoring session.
● Source port (MD) can be monitored by more than one destination port (MG).
● Destination port (MG) can be a physical interface or port-channel interface.
● A Port monitoring session can have multiple source statements.
● Range command is supported in the source statement, where we can specify a range of interfaces of (Physical, Port
Channel or VLAN) types.
● One Destination Port (MG) can be used in multiple sessions.
● There can be a maximum of 128 source ports in a Port Monitoring session.
● Flow based monitoring is supported for all type of source interfaces.
Port Monitoring
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