Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.14.1.0 - Page 695

Dell EMC 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 TenGig 6/1 destination TeGig 6/2 direction tx, if the MD port TenGig 6/1 is an untagged member of any VLAN, all monitored 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. 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 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. 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. MONITOR SESSION mode source Example of Viewing Port Monitoring Configuration To display information on currently configured port-monitoring sessions, use the show monitor session command from EXEC Privilege mode. DellEMC(conf)#monitor session 0 DellEMC(conf-mon-sess-0)#$source te 1/1 dest te 1/2 dir rx DellEMC(conf-mon-sess-0)#show c ! monitor session 0 source TenGigabitEthernet 1/1 destination TenGigabitEthernet 1/2 direction rx DellEMC(conf-mon-sess-0)# DellEMC(conf-mon-sess-0)#do show monitor session SessID Source Destination Dir Mode Source IP Dest IP DSCP TTL Rate Gre-Protocol FcMonitor 0 Te 1/1 Te 1/2 rx Port 0.0.0.0 0.0.0.0 0 0 A N/A No Drop ---No N/ DellEMC(conf)#monitor session 0 DellEMC(conf-mon-sess-0)#source po 10 dest ten 1/2 dir rx DellEMC(conf-mon-sess-0)#do show monitor session SessID Source Destination Dir Mode Source IP Rate Gre-Protocol FcMonitor 0 Te 1/1 Te 1/2 rx Port 0.0.0.0 A N/A No 0 Po 10 Te 1/2 rx Port 0.0.0.0 A N/A No Dest IP -------0.0.0.0 0.0.0.0 DSCP TTL ---- --- 0 0 0 0 Drop ---No N/ No N/ Port Monitoring 695