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 configurations.
Figure 90. Port Monitoring Configurations
Dell Networking OS Behavior: All monitored frames are tagged if the configured 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 configuration
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 difference 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 traffic even after an MD participating in spanning
tree protocol (STP) transitions from the forwarding to blocking.
Configuring Port Monitoring
To configure port monitoring, use the following commands.
1 Verify that the intended monitoring port has no configuration 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 traffic, as shown in the following example.
Port Monitoring 586