Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

In Standalone or VLT modes, by default, all the server-facing ports are tracked by the operational status of the uplink LAG. If the uplink LAG goes down, the aggregator loses its connectivity and is no longer operational. All the server-facing ports are brought down after the specified defer-timer interval, which is 10 seconds by default. If you have configured VLAN, you can reduce the defer time by changing the defer-timer value or remove it by using the no defer-timer command.

1. View the Uplink status group. EXEC Privilege mode show uplink-state-group

   Dell#show uplink-state-group 
                                       Uplink State Group: 1   Status: Enabled, Down
                                    

2. Enable the uplink group tracking. UPLINK-STATE-GROUP mode enable

   Dell(conf)#uplink-state-group 1
                                       Dell(conf-uplink-state-group-1)#enable
                                       
                                    

   To disable the uplink group tracking, use the no enable command.
3. Change the default timer. UPLINK-STATE-GROUP mode defer-timer seconds

   Dell(conf)#uplink-state-group 1
                                       Dell(conf-uplink-state-group-1)#defer-timer 20
                                       Dell(conf-uplink-state-group-1)#show config
                                       !
                                       uplink-state-group 1
                                       downstream TenGigabitEthernet 0/1-12
                                       upstream Port-channel 128
                                       defer-timer 20