Introduction

Just like any distributed protocol, LDP relies on timers.

LDP Hello Interval

• Hello Timer is the interval that hello messages will be sent.
• Default is 5 seconds.

LDP Hold Timer

• Hold Timer is the time that the LDP session will go down if no hellos have been received after the Hold timer expires. Default is 15 sec.
• Every time a hello message or LDP message is received, hold timer is reset.

LDP Backoff Timer

• If two LSR can't agree on LDP parameters, they will exponentially backoff the session setup until they can agree.

Relevant Commands

mpls ldp discovery hello interval

R1(config)#        mpls ldp discovery hello interval <1-65535 sec>

mpls ldp discovery hello holdtime

R1(config)#        mpls ldp discovery hello holdtime <1-65535 sec>

mpls ldp backoff

R1(config)#        mpls ldp backoff (initial-backoff) (maximum-backoff)

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