Dell Force10 C150 Configuration Manual page 818

Figure 38-5. Port Monitoring Configurations on the C-Series and S-Series
Monitor Session 0
Monitor Session 1
Monitor Session 2
FTOS Behavior: On the C-Series and S-Series, all monitored frames are tagged if the configured
monitoring direction is transmit (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 6/0 destination gig 6/1 direction tx, if the MD port
gigabitethernet 6/0 is an untagged member of any VLAN, all monitored frames that the MG port
gigabitethernet 6/1 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.
FTOS Behavior: The C-Series and S-Series continue to mirror outgoing traffic even after an MD
participating in Spanning Tree Protocol transitions from the forwarding to blocking.
818 | Port Monitoring
Line Card 0
Port-Pipe 0
Port-Pipe 1
MD MG
MD
MD
MD MG
MD MG
MD
Line Card 1
Port-Pipe 0 Port-Pipe 1
MG
Port Monitoring 003