Default Udld Configuration - Cisco Catalyst 4500 Series Configuration Manual

Default UDLD Configuration

Default UDLD Configuration
Table 30-1
Table 30-1 UDLD Default Configuration
Feature
UDLD global enable state
UDLD per-interface enable state for fiber-optic media
UDLD per-interface enable state for twisted-pair (copper) media Disabled on all Ethernet 10/100 and 1000BASE-TX
Fast UDLD per-interface enable state.
Configuring UDLD on the Switch
The following sections describe how to configure UDLD:
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Fast UDLD Guidelines and Restrictions
When using (or configuring) Fast UDLD, consider these guidelines and restrictions:
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Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
30-4
shows the UDLD default configuration.
Fast UDLD Guidelines and Restrictions, page 30-4
Enabling UDLD Globally, page 30-5
Enabling UDLD on Individual Interfaces, page 30-6
Disabling UDLD on Individual Interfaces, page 30-7
Disabling UDLD on a Fiber-Optic Interface, page 30-7
Configuring a UDLD Probe Message Interval Globally, page 30-8
Resetting Disabled LAN Interfaces, page 30-8
Fast UDLD is disabled by default.
Configure fast UDLD only on point-to-point links between network devices that support fast UDLD.
You can configure fast UDLD in either normal or aggressive mode.
Do not enter the link debounce command on fast UDLD ports.
Configure fast UDLD on at least two links between each connected network device. This reduces
the number of link disablements due to false positives.
Fast UDLD does not report a unidirectional link if the same error occurs simultaneously on more
than one link to the same neighbor device.
Fast UDLD is supported on a limited number of ports.
Default Status
Globally disabled.
Enabled on all Ethernet fiber-optic interfaces.
interfaces.
Disabled on all interfaces.
Chapter 30 Configuring UDLD
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