Udld Reset Options; Default Udld Configuration - Cisco Catalyst 2960-XR Configuration Manual

Default UDLD Configuration

If the detection window ends and no valid reply message is received, the link might shut down, depending on
the UDLD mode. When UDLD is in normal mode, the link might be considered undetermined and might not
be shut down. When UDLD is in aggressive mode, the link is considered unidirectional, and the port is disabled.
Related Topics
Enabling UDLD Globally, on page 171
Enabling UDLD on an Interface, on page 172

UDLD Reset Options

If an interface becomes disabled by UDLD, you can use one of the following options to reset UDLD:
• The udld reset interface configuration command.
• The shutdown interface configuration command followed by the no shutdown interface configuration
• The no udld {aggressive | enable} global configuration command followed by the udld {aggressive |
• The no udld port interface configuration command followed by the udld port [aggressive] interface
• The errdisable recovery cause udld global configuration command enables the timer to automatically
Related Topics
Enabling UDLD Globally, on page 171
Enabling UDLD on an Interface, on page 172
Default UDLD Configuration
Table 20: Default UDLD Configuration
Feature
UDLD global enable state
UDLD per-port enable state for fiber-optic media
UDLD per-port enable state for twisted-pair (copper)
media
UDLD aggressive mode
Related Topics
Enabling UDLD Globally, on page 171
Catalyst 2960-XR Switch Layer 2 Configuration Guide, Cisco IOS Release 15.0(2)EX1
170
command restarts the disabled port.
enable} global configuration command reenables the disabled ports.
configuration command reenables the disabled fiber-optic port.
recover from the UDLD error-disabled state, and the errdisable recovery interval interval global
configuration command specifies the time to recover from the UDLD error-disabled state.
Configuring UniDirectional Link Detection
Default Setting
Globally disabled
Disabled on all Ethernet fiber-optic ports
Disabled on all Ethernet 10/100 and 1000BASE-TX
ports
Disabled
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