Users Guide

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.
Dell(conf-mon-sess-300)#do show mon session
SessionID Source Destination Direction Mode Type
--------- ------ ----------- --------- ---- ----
0 Gi 1/13 Gi 1/1 rx interface Port-based
10 Gi 1/14 Gi 1/2 rx interface Port-based
20 Gi 1/15 Gi 1/3 rx interface Port-based
30 Gi 1/16 Gi 1/37 rx interface Port-based
100 Gi 1/25 Gi 1/38 tx interface Port-based
110 Gi 1/26 Gi 1/39 tx interface Port-based
300 Gi 1/17 Gi 1/1 tx interface Port-based
Dell(conf-mon-sess-300)#
Given these parameters, the following illustration shows the possible port monitoring congurations.
Figure 89. Port Monitoring Congurations
Dell 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.
Dell Networking OS Behavior: The platform continues to mirror outgoing trac even after an MD participating in spanning tree protocol
(STP) transitions from the forwarding to blocking.
Conguring Port Monitoring
To congure port monitoring, use the following commands.
1 Verify that the intended monitoring port has no conguration other than no shutdown, as shown in the following example.
EXEC Privilege mode
show interface
2 Create a monitoring session using the command monitor session from CONFIGURATION mode, as shown in the following example.
CONFIGURATION mode
monitor session
monitor session type rpm/erpm
type is an optional keyword, required only for rpm and erpm
3 Specify the source and destination port and direction of trac, as shown in the following example.
MONITOR SESSION mode
Port Monitoring
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