Dell Force10 S4820T S4820T Configuration Guide - Page 731

Figure 35-4. Number of Monitoring Ports on the C-Series and S-Series FTOS(conf-mon-sess-300)#do show mon session SessionID Source Destination --------- ------ ----------- 0 Gi 0/13 Gi 0/1 10 Gi 0/14 Gi 0/2 20 Gi 0/15 Gi 0/3 30 Gi 0/16 Gi 0/37 100 Gi 0/25 Gi 0/38 110 Gi 0/26 Gi 0/39 300 Gi 0/17 Gi 0/1 FTOS(conf-mon-sess-300)# Direction --------rx rx rx rx tx tx tx Mode ---interface interface interface interface interface interface interface Type ---Port-based Port-based Port-based Port-based Port-based Port-based Port-based A source port may only be monitored by one destination port (Message 6), but a destination port may monitor more than one source port. Given these parameters, Figure 35-1 illustrates conceptually the possible port monitoring configurations on the C-Series and S-Series. Message 5 One Destination Port in a Monitoring Session Error Message on C-Series and S-Series % Error: Exceeding max MG ports for this MD port pipe. Message 6 One Destination Port per Source Port Error Message % Error: MD port is already being monitored. Figure 35-5. Port Monitoring Configurations on the C-Series and S-Series Line Card 0 Line Card 1 Port-Pipe 0 Port-Pipe 1 Port-Pipe 0 Port-Pipe 1 Monitor Session 0 MD MD Monitor Session 1 MD MD MG MD MG MG Monitor Session 2 MD MG Port Monitoring 003 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. Port Monitoring | 731