Example of Viewing a Monitoring SessionIn the example below, 0/25 and 0/26 belong to Port-pipe 1. This port-pipe has the same restriction ofonly four destination ports, new or used.Dell(conf-mon-sess-300)#do show mon sessionSessionID Source Destination Direction Mode Type--------- ------ ----------- --------- ---- ----0 Te 1/13 Te 1/1 rx interface Port-based10 Te 1/14 Te 1/2 rx interface Port-based20 Te 1/15 Te 1/3 rx interface Port-based30 Te 1/16 Te 1/37 rx interface Port-based100 Te 1/25 Te 1/38 tx interface Port-based110 Te 1/26 Te 1/39 tx interface Port-based300 Te 1/17 Te 1/1 tx interface Port-basedDell(conf-mon-sess-300)#Given these parameters, the following illustration shows the possible port monitoring configurations onthe S-Series.Figure 88. Port Monitoring Configurations on the S-SeriesDell Networking OS Behavior: All monitored frames are tagged if the configured monitoring direction isegress (TX), regardless of whether the monitored port (MD) is a Layer 2 or Layer 3 port. If the MD port is aLayer 2 port, the frames are tagged with the VLAN ID of the VLAN to which the MD belongs. If the MDport is a Layer 3 port, the frames are tagged with VLAN ID 4095. If the MD port is in a Layer 3 VLAN, theframes are tagged with the respective Layer 3 VLAN ID. For example, in the configuration source TeGig6/1 destination TeGig 6/2 direction tx, if the MD port TenGig 6/1 is an untagged member of any VLAN, allmonitored frames that the MG port TeGig 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. Thisbehavior might result in a difference between the number of egress packets on the MD port andmonitored packets on the MG port.Dell Networking OS Behavior: The platform continues to mirror outgoing traffic even after an MDparticipating in spanning tree protocol (STP) transitions from the forwarding to blocking.Configuring Port MonitoringTo configure port monitoring, use the following commands.1. Verify that the intended monitoring port has no configuration other than no shutdown, as shown inthe following example.EXEC Privilege mode618 Port Monitoring
