Reference Guide

Uplink Failure Detection (UFD) | 243
24
Uplink Failure Detection (UFD)
Overview
Uplink failure detection (UFD) provides detection of the loss of upstream connectivity and, if used
with network interface controller (NIC) teaming, automatic recovery from a failed link.
Commands
The UFD commands described in this chapter are:
• defer-timer
• enable
defer-timer
Configure a timer that prevents unwanted flapping of downstream ports when the uplink port channel
goes down and comes up.
Syntax
defer-timer seconds
Parameters
Defaults
10 (Standalone mode)
Command Modes
UPLINK-STATE-GROUP
Command
History
Usage
Information
This command is not supported in programmable-mux mode.
Note: In Standalone, VLT, and Stacking modes, the UFD group number is 1 by default and
cannot be changed.
seconds Specify the time (in seconds) to wait for the upstream port channel (LAG
128) to come back up before server ports are brought down. The range is
from 1 to 120.
Version 9.2(0.0) Introduced on the M I/O Aggregator.