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How is UDLD different than LoopGuard in detecting link failure?

CCNP Network Administration Spanning Tree CCNA Certified IT Security
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Question added by Syed Javed , it consultant , Infosys
Date Posted: 2016/02/03
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Akbar Maqsood Alam
by Akbar Maqsood Alam , System Admin , Star Services LLC

The loop guard feature is enabled on a per-port basis. However, as long as it blocks the port on the STP level, loop guard blocks inconsistent ports on a per-VLAN basis (because of per-VLAN STP)

Ramiz Atout
by Ramiz Atout , Network admin, social media , Sharjah Media Centre

The loop guard feature is enabled on a per-port basis. However, as long as it blocks the port on the STP level, loop guard blocks inconsistent ports on a per-VLAN basis (because of per-VLAN STP). That is, if BPDUs are not received on the trunk port for only one particular VLAN, only that VLAN is blocked (moved to loop-inconsistent STP state). For the same reason, if enabled on an EtherChannel interface, the entire channel is blocked for a particular VLAN, not just one link (because EtherChannel is regarded as one logical port from the STP point of view).

Laith Ibrahim
by Laith Ibrahim , Presales Consultant , SamaWave Solutions

The UDLD is a protocol to check if the fiber connection is bidirectional or not,

but Loopguard is a safe measure to prevent loops in case of failure in the hardware.

 

Read more about them at cisco website.

 

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