Administrator Guide

To revert to the default setting, use the no downstream disable links command.
4. (Optional) Enable auto-recovery so that UFD-disabled downstream ports in the uplink-state group come up when a disabled
upstream port in the group comes back up.
UPLINK-STATE-GROUP mode
downstream auto-recover
The default is auto-recovery of UFD-disabled downstream ports is enabled.
To disable auto-recovery, use the no downstream auto-recover command.
5. (Optional) Enters a text description of the uplink-state group.
UPLINK-STATE-GROUP mode
description text
The maximum length is 80 alphanumeric characters.
6. (Optional) Disables upstream-link tracking without deleting the uplink-state group.
UPLINK-STATE-GROUP mode
no enable
The default is upstream-link tracking is automatically enabled in an uplink-state group.
To re-enable upstream-link tracking, use the enable command.
Clearing a UFD-Disabled Interface
You can manually bring up a downstream interface in an uplink-state group that UFD disabled and is in a UFD-Disabled Error state.
To re-enable one or more disabled downstream interfaces and clear the UFD-Disabled Error state, use the following command.
• Re-enable a downstream interface on the switch/router that is in a UFD-Disabled Error State so that it can send and receive
trac.
EXEC mode
clear ufd-disable {interface interface | uplink-state-group group-id}
For interface, enter one of the following interface types:
– 10 Gigabit Ethernet: enter tengigabitethernet {slot/port | slot/port-range}
– 40 Gigabit Ethernet: enter fortygigabitethernet {slot/port | slot/port-range}
– Port channel: enter port-channel {1-512 | port-channel-range}
* Where port-range and port-channel-range specify a range of ports separated by a dash (-) and/or individual
ports/port channels in any order; for example:
tengigabitethernet 1/1-2,5,9,11-12
port-channel 1-3,5
* A comma is required to separate each port and port-range entry.
clear ufd-disable {interface interface | uplink-state-group group-id}: re-enables all UFD-disabled
downstream interfaces in the group. The range is from 1 to 16.
Example of Syslog Messages Before and After Entering the clear ufd-disable uplink-state-group Command (S50)
The following example message shows the Syslog messages that display when you clear the UFD-Disabled state from all disabled
downstream interfaces in an uplink-state group by using the clear ufd-disable uplink-state-group group-id
command. All downstream interfaces return to an operationally up state.
00:10:12: %STKUNIT0-M:CP %IFMGR-5-ASTATE_DN: Changed interface Admin state to down: Te 0/1
00:10:12: %STKUNIT0-M:CP %IFMGR-5-ASTATE_DN: Changed interface Admin state to down: Te 0/2
Uplink Failure Detection (UFD)
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