Reference Guide

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Uplink Failure Detection (UFD)
Uplink failure detection (UFD) provides detection of the loss of upstream connectivity and, if you use this with NIC
teaming, automatic recovery from a failed link. UFD is supported on the S4820T Dell Networking platform.
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 traffic.
S4820T
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:
• Fast Ethernet: fastethernet {slot/port | slot/
port-range}
• 1 Gigabit Ethernet: gigabitethernet {slot/port |
slot/ port-range}
• 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: gigabitethernet
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.
Command Modes CONFIGURATION
Command History
This guide is platform-specific. For command information about other platforms, refer to the
relevant FTOS Command Line Reference Guide .
The following is a list of the FTOS version history for this command.
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