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Port Monitoring on C-Series and S-Series
The C-Series and S-Series support multiple source-destination statements in a monitor session, but there
may only be one destination port in a monitoring session (Message 4).
The number of source ports FTOS allows within a port-pipe is equal to the number of physical ports in the
port-pipe (n). However, n number of ports may only have four different destination ports (Message 5).
Figure 38-2. Number of Monitoring Ports on the C-Series and S-Series
In Figure 38-2, ports 0/13, 0/14, 0/15, and 0/16 all belong to the same port-pipe. They are pointing to four
different destinations (0/1, 0/2, 0/3, and 0/37). Now it is not possible for another source port from the same
port-pipe (for example, 0/17) to point to another new destination (for example, 0/4). If you attempt to
configure another destination, Message 5 appears. However, you can configure another monitoring session
that uses one of previously used destination ports, as shown in Figure 38-3.
Message 4 One Destination Port in a Monitoring Session Error Message on C-Series and S-Series
% Error: Only one MG port is allowed in a session.
FTOS#show mon session
SessionID Source Destination Direction Mode Type
--------- ------ ----------- --------- ---- ----
0 Gi 0/13 Gi 0/1 rx interface Port-based
10 Gi 0/14 Gi 0/2 rx interface Port-based
20 Gi 0/15 Gi 0/3 rx interface Port-based
30 Gi 0/16 Gi 0/37 rx interface Port-based
FTOS(conf)#mon ses 300
FTOS(conf-mon-sess-300)#source gig 0/17 destination gig 0/4 direction tx
% Error: Exceeding max MG ports for this MD port pipe.
FTOS(conf-mon-sess-300)#
FTOS(conf-mon-sess-300)#source gig 0/17 destination gig 0/1 direction tx
FTOS(conf-mon-sess-300)#do show mon session
SessionID Source Destination Direction Mode Type
--------- ------ ----------- --------- ---- ----
0 Gi 0/13 Gi 0/1 rx interface Port-based
10 Gi 0/14 Gi 0/2 rx interface Port-based
20 Gi 0/15 Gi 0/3 rx interface Port-based
30 Gi 0/16 Gi 0/37 rx interface Port-based
300 Gi 0/17 Gi 0/1 tx interface Port-based
FTOS(conf-mon-sess-300)#