UDLD time delay

UDLD protocol informs the link partner simultaneously as it detects a state change from unidirectional to bidirectional traffic. Additional packet exchanges will be carried out by UDLD in addition to the existing UDLD exchanges whenever state changes from unidirectional to bidirectional.

Peer state transition timings

Interval Time

Interval 1

Interval 1 + delta

Interval 2

Interval 3

 

5 sec

5+(<5) sec*

10 sec

15 sec

With triggered updates

State = blockedPeer State = blocked

Inform PeerState = unblockedPeer State = unblocked

Regular UDLD TX

Regular UDLD TX

Without triggered updates

State = blockedPeer State = blocked

State = unblockedPeer State = blocked

Inform PeerState = unblockedPeer State = unblocked

Regular UDLD TX

*delta is the time when the unblock event occurs on local side