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UDLD - best practise while configuring in service provider envn

Hi to everyone,

Would be greatful if you guys guide me to get know the best practise while configuring UDLD in service provider environment.

appreciate your help

shiv

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Re: UDLD - best practise while configuring in service provider e

Hi to everyone,

Would be greatful if you guys guide me to get know the best practise while configuring UDLD in service provider environment.

appreciate your help

shiv

Hi Shiv,

Genral  recommendation and best practices is that UDLD to be enabled on all ports terminating links where a potential miswiring can take place or on ports where STP is running. UDLD needs to be enabled globally as well as on a per interface basis. The commands to enable UDLD globally and on an interface are as follows:


6K-LV2-CL3(config)# udld enable
6K-LV2-CL3(config)# interface g1/2
6K-LV2-CL3(config-if)# udld port


UDLD supports two modes of operation: normal and aggressive. The recommended mode to use in the vast majority of the network designs is the former, whereas the latter should be used with great care in those cases where a loss of connectivity with a neighbor represents a serious connectivity problem (for example, when a bundled port in an EtherChannel connection loses connectivity with its peer and EtherChannel is not running a protocol such as PAgP or LACP).

While UDLD can be used to detect "directionality" problems on any Ethernet link, another feature should be used in synergy with UDLD to guarantee greater STP robustness: the feature in question is called STP Loopguard.

Loopguard can be enabled either globally or on a per-port basis thus:

6K-LV2-CL3(config)# spanning-tree loopguard default
6K-LV2-CL3(config-if)# spanning-tree guard loop

Hope to Help !!

Ganesh.H

4 REPLIES

Re: UDLD - best practise while configuring in service provider e

Hi to everyone,

Would be greatful if you guys guide me to get know the best practise while configuring UDLD in service provider environment.

appreciate your help

shiv

Hi Shiv,

Genral  recommendation and best practices is that UDLD to be enabled on all ports terminating links where a potential miswiring can take place or on ports where STP is running. UDLD needs to be enabled globally as well as on a per interface basis. The commands to enable UDLD globally and on an interface are as follows:


6K-LV2-CL3(config)# udld enable
6K-LV2-CL3(config)# interface g1/2
6K-LV2-CL3(config-if)# udld port


UDLD supports two modes of operation: normal and aggressive. The recommended mode to use in the vast majority of the network designs is the former, whereas the latter should be used with great care in those cases where a loss of connectivity with a neighbor represents a serious connectivity problem (for example, when a bundled port in an EtherChannel connection loses connectivity with its peer and EtherChannel is not running a protocol such as PAgP or LACP).

While UDLD can be used to detect "directionality" problems on any Ethernet link, another feature should be used in synergy with UDLD to guarantee greater STP robustness: the feature in question is called STP Loopguard.

Loopguard can be enabled either globally or on a per-port basis thus:

6K-LV2-CL3(config)# spanning-tree loopguard default
6K-LV2-CL3(config-if)# spanning-tree guard loop

Hope to Help !!

Ganesh.H

Community Member

Re: UDLD - best practise while configuring in service provider e

hi,

i wanted to configure in aggressive mode since need to track lines terminated to the port closely.Do you have any docs for this pls..

thanks

shiv

Re: UDLD - best practise while configuring in service provider e

hi,

i wanted to configure in aggressive mode since need to track lines terminated to the port closely.Do you have any docs for this pls..

thanks

shiv

Hi Shiv,

Check out the below link for configuration UDLD in cisco switches

http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.1E/native/configuration/guide/udld.html

Hope to Help !!

Ganesh.H

Community Member

Re: UDLD - best practise while configuring in service provider e

Thank you so much Ganesh

shiv

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