Users 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.
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:
• 1 Gigabit Ethernet: gigabitethernet {slot/port | slot/port-
range}
• 10 Gigabit Ethernet: tengigabitethernet {slot/port | slot/
port-range}
•
Port channel: port-channel {1–128 | 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-specic. For command information about other platforms, see the relevant Dell
Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.2(1.0) Introduced on the Z9500.
8.3.19.0 Introduced on the S4820T.
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Uplink Failure Detection (UFD)