Reference Guide
638 | Port Monitoring
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Figure 34-3. Number of Monitoring Ports on the S-Series
A source port may only be monitored by one destination port (Message 3), but a destination port may
monitor more than one source port. Given these parameters, Figure 34-4 illustrates conceptually the
possible port monitoring configurations on the S-Series.
Figure 34-4. Port Monitoring Configurations on the S-Series
Message 2 One Destination Port in a Monitoring Session Error Message on S-Series
% Error: Exceeding max MG ports for this MD port pipe.
Message 3 One Destination Port per Source Port Error Message
% Error: MD port is already being monitored.
FTOS Behavior: On the S-Series and Z-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 te 6/0 destination te 6/1 direction tx, if the MD port
Tengigabitethernet 6/0 is an untagged member of any VLAN, all monitored frames that the MG port
Tengigabitethernet 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(conf-mon-sess-300)#do show mon session
SessionID Source Destination Direction Mode Type
--------- ------ ----------- --------- ---- ----
0 Te 0/13 Te 0/1 rx interface Port-based
10 Te 0/14 Te 0/2 rx interface Port-based
20 Te 0/15 Te 0/3 rx interface Port-based
30 Te 0/16 Te 0/37 rx interface Port-based
100 Te 0/25 Te 0/38 tx interface Port-based
110 Te 0/26 Te 0/39 tx interface Port-based
300 Te 0/17 Te 0/1 tx interface Port-based
FTOS(conf-mon-sess-300)#
Port-Pipe 0
Port-Pipe 1
Port-Pipe 0
MD
M
onitor Session 0 MG
MD
M
onitor Session 1
M
onitor Session 2
Port Monitoring 0
03
Line Card 0 Line Card 1
Port-Pipe 1
MD
MD MG
MD
MG
MD
MG