Dell PowerEdge FX2/FX2s - Manual (Page 208)

– For an example of debug log message, refer to Clearing a UFD-Disabled Interface .
Uplink Failure Detection (SMUX mode)
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
Configuring Uplink Failure Detection (PMUX mode)
To configure UFD, use the following commands.
1. Create an uplink-state group and enable the tracking of upstream links on the switch/router.
CONFIGURATION mode
uplink-state-group group-id
• group-id: values are from 1 to 16.
To delete an uplink-state group, use the no uplink-state-group group-id command.
2. Assign a port or port-channel to the uplink-state group as an upstream or downstream interface.
208 Uplink Failure Detection (UFD)