Users Guide

downstream disable links
Congure the number of downstream links in the uplink-state group that are disabled if one upstream link in an uplink-state group
goes down.
Syntax
downstream disable links {number |all}
To revert to the default setting, use the no downstream disable links command.
Parameters
number Enter the number of downstream links to be brought down by UFD. The range is
from 1 to 1024.
all Brings down all downstream links in the group.
Defaults No downstream links are disabled when an upstream link in an uplink-state group goes down.
Command Modes UPLINK-STATE-GROUP
Command History
This guide is platform-specic. For command information about other platforms, refer to 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
9.2(0.0) Introduced on the M I/O Aggregator. This command is supported in Programmable-
Mux (PMUX) mode only.
8.3.19.0 Introduced on the S4820T.
8.3.12.0 Introduced on the S4810.
8.4.2.3 Introduced on the S-Series S50.
Usage Information
A user-congurable number of downstream interfaces in an uplink-state group are put into a link-down state
with an UFD-Disabled error message when one upstream interface in an uplink-state group goes down.
If all upstream interfaces in an uplink-state group go down, all downstream interfaces in the same uplink-
state group are put into a link-down state.
Related Commands
• downstream — assigns a port or port-channel to the uplink-state group as a downstream interface.
• uplink-state-group — creates an uplink-state group and enables the tracking of upstream links.
enable
Enable uplink state group tracking for a specic UFD group.
Syntax
enable
To disable upstream-link tracking without deleting the uplink-state group, use the no enable command.
Defaults Upstream-link tracking is automatically enabled in an uplink-state group.
Command Modes UPLINK-STATE-GROUP
1524
Uplink Failure Detection (UFD)