Deployment Guide

Uplink Failure Detection (UFD)
Uplink failure detection (UFD) provides detection of the loss of upstream connectivity and, if you use this with network interface controller
(NIC) teaming, automatic recovery from a failed link.
NOTE: In Standalone, VLT, and Stacking modes, the UFD group number is 1 by default and cannot be changed.
Topics:
• clear ufd-disable
• debug uplink-state-group
• defer-timer
• description
• downstream
• downstream auto-recover
• downstream disable links
• enable
• show running-cong uplink-state-group
• show uplink-state-group
• uplink-state-group
• upstream
clear ufd-disable
Re-enable one or more downstream interfaces on the switch/router that are in a UFD-Disabled Error state so that an interface can send
and receive trac.
Syntax
clear ufd-disable {interface interface | uplink-state-group group-id}
Parameters
interface interface Specify one or more downstream interfaces. For interface, enter one of the following
interface types:
• 10 Gigabit Ethernet: tengigabitethernet {slot/port |slot/ port-
range}
• Port channel: 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.
uplink-state-group
group-id
Re-enables all UFD-disabled downstream interfaces in the group. The valid group-id
values are from 1 to 16.
Defaults A downstream interface in a UFD-disabled uplink-state group is also disabled and is in a UFD-Disabled Error state.
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