Users Guide

• Single MD can be monitored on max. of 4 MG ports.
Port Monitoring
Port monitoring is supported on both physical and logical interfaces, such as VLAN and port-channel interfaces. The source
port (MD) with monitored traffic and the destination ports (MG) to which an analyzer can be attached must be on the same
switch. You can configure up to 128 source ports in a monitoring session. Only one destination port is supported in a
monitoring session. The platform supports multiple source-destination statements in a single monitor session.
The maximum number of source ports that can be supported in a session is 128.
The maximum number of destination ports that can be supported depends on the port mirroring directions as follows:
• 4 per port pipe, if the four destination ports mirror in one direction, either rx or tx.
• 2 per port pipe, if the two destination ports mirror in bidirection.
• 3 per port pipe, if one of the destination port mirrors bidirection and the other two ports mirror in one direction (either rx or
tx).
In the following examples, ports Te 1/1/1, Te 1/1/2, Te 1/1/3, and Te 1/1/4 all belong to the same pipeline. They are pointing to
four different destinations: Te 1/4/1, Te 1/4/2, Te 1/4/3, and Te 1/4/4. If you attempt to configure another destination (to create
5 MG port), the system displays an error message.
Example of Changing the Destination Port in a Monitoring Session
Dell(conf-mon-sess-5)#do show moni session
SessID Source Destination Dir Mode Source IP Dest IP DSCP TTL Drop Rate
------ ------ ----------- --- ---- --------- -------- ---- ---- --- -----
100 Te 1/1/1 Te 1/4/1 rx Port N/A N/A N/A N/A No N/A
200 Te 1/1/2 Te 1/4/2 tx Port N/A N/A N/A N/A No N/A
300 Te 1/1/3 Te 1/4/3 rx Port N/A N/A N/A N/A No N/A
400 Te 1/1/4 Te 1/4/4 rx Port N/A N/A N/A N/A No N/A
Dell(conf-mon-sess-5)#
Example of Configuring Another Monitoring Session with a Previously Used Destination Port
Dell(conf)#mon ses 300
Dell(conf-mon-sess-300)#source TenGig 1/17/1 destination TenGig 1/4/1 direction tx
% Error: Exceeding max MG ports for this MD port pipe.
Example of Viewing a Monitoring Session
Dell#show running monitor session
!
monitor session 100
source TenGigabitEthernet 1/1/1 destination TenGigabitEthernet 1/4/1 direction rx
!
monitor session 200
source TenGigabitEthernet 1/1/2 destination TenGigabitEthernet 1/4/2 direction tx
!
monitor session 300
source TenGigabitEthernet 1/1/3 destination TenGigabitEthernet 1/4/3 direction rx
!
monitor session 400
source TenGigabitEthernet 1/1/4 destination TenGigabitEthernet 1/4/4 direction rx
!
Dell 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 1/6/1 destination TeGig 1/6/2 direction tx, if the MD port TenGig 1/6/1 is an untagged member of any VLAN, all
monitored frames that the MG port TeGig 1/6/2 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.
Port Monitoring 622