Udld
Hi guys,
I have a small (and I thought at the time quick) UDLD question that has been bugging me for awhile. I have been researching for awhile now about the default settings for UDLD per interface default settings. Everything, and I mean everything from 2000 - 2012 articles state that UDLD is ENABLED per interface by default on Fiber links. However, when I check this in a lab / at work on "real" equipment using show udld it states port enable status as disabled...
Interface Gi1/0/2
---
Port enable administrative configuration setting: Follows device default
Port enable operational state: Disabled
Current bidirectional state: Unknown
this is from a valid fiber link between two cisco switches (3750X & 2960S).
Thanks!
I have a small (and I thought at the time quick) UDLD question that has been bugging me for awhile. I have been researching for awhile now about the default settings for UDLD per interface default settings. Everything, and I mean everything from 2000 - 2012 articles state that UDLD is ENABLED per interface by default on Fiber links. However, when I check this in a lab / at work on "real" equipment using show udld it states port enable status as disabled...
Interface Gi1/0/2
---
Port enable administrative configuration setting: Follows device default
Port enable operational state: Disabled
Current bidirectional state: Unknown
this is from a valid fiber link between two cisco switches (3750X & 2960S).
Thanks!
Comments
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NetworkVeteran
Member Posts: 2,338 ■■■■■■■■□□
Everything, and I mean everything from 2000 - 2012 articles state that UDLD is ENABLED per interface by default on Fiber links.this is from a valid fiber link between two cisco switches (3750X & 2960S)
When in doubt, check the docs. The docs are more reliable than random articles.
Catalyst 2960 and 2960-S Software Configuration Guide, 12.2(55)SE - Configuring UDLD* [Cisco Catalyst 2960 Series Switches] - Cisco Systems
UDLD global enable state
Globally disabled
UDLD per-port enable state for fiber-optic media
Disabled on all Ethernet fiber-optic ports
UDLD per-port enable state for twisted-pair (copper) media
Disabled on all Ethernet 10/100 and 1000BASE-TX ports
UDLD aggressive mode
Disabled
(When really in doubt, lab it up!) -
xXErebuS
Member Posts: 230
NetworkVeteran wrote: »When in doubt, check the docs. The docs are more reliable than random articles.
Catalyst 2960 and 2960-S Software Configuration Guide, 12.2(55)SE - Configuring UDLD* [Cisco Catalyst 2960 Series Switches] - Cisco Systems
UDLD global enable state
Globally disabled
UDLD per-port enable state for fiber-optic media
Disabled on all Ethernet fiber-optic ports
UDLD per-port enable state for twisted-pair (copper) media
Disabled on all Ethernet 10/100 and 1000BASE-TX ports
UDLD aggressive mode
Disabled
(When really in doubt, lab it up!)
Thanks for finding that; I guess I should have looked at the information for particular switch. It's just weird that ever single Cisco article (non device specific) says opposite. Guess I will be looking at switch specific information from now on!