Hello,
Please see the below KB for procedure on how to configure port mirroring.
https://gtacknowledge.extremenetworks.com/articles/Q_A/How-to-configure-SPAN-Port-mirroring-in-NOS
Also, additional details are in the VDX monitoring manual. See page 33.
https://documentation.extremenetworks.com/networkos/SW/74x/nos-740-monitoring.pdf
One thing to remember is to disable LLDP on the destination mirror port or you will get an error while trying to configure the monitor session.
For example. The below disables LLDP on port 10, so it can be the destination mirror port. Then, we configure a monitor session for it.
sw0(conf-if-te-104/0/1)# int te 104/0/10
sw0(conf-if-te-104/0/10)# lldp disable
2020/08/04-05:00:34, [ONMD-1004], 878, DCE, INFO, sw0, LLDP is disabled on interface Te 104/0/10.
sw0(conf-if-te-104/0/10)# exit
sw0(config)# monitor session 1
2020/08/04-05:00:42, [NSM-1031], 879, DCE, INFO, sw0, Session 1 is created.
sw0(config-session-1)# source tengigabitethernet 104/0/1 destination tengigabitethernet 104/0/10 direction both
2020/08/04-05:01:21, [NSM-1034], 880, DCE, INFO, sw0, Session 1 configuration is added.
sw0(config-session-1)# do sh run monitor
monitor session 1
source tengigabitethernet 104/0/1 destination tengigabitethernet 104/0/10 direction both
!
Hope that helps.
