Alcatel-Lucent 6850-48 Reference Guide

MPLS LDP Commands

OmniSwitch CLI Reference Guide

page 24-7

Configures the hello timeout (also referred to as the hold time) and the hello interval on a global (all LDP 
interfaces) basis or on a per-interface basis. The hello timeout determines how long LDP waits to receive 
hello messages from a peer before declaring that the peer is down. The hello interval determines how often 
LDP sends out hello messages, which advertise the hello timeout. 

configure router ldp interface-parameters [interface ip-intf-name] hello timeout factor 

configure router ldp interface-parameters [interface ip-intf-name] no hello 

The name of an existing LDP interface.

The hello timeout, in seconds. The valid range is 1–65535 seconds.

The number of hello messages to send during the hello timeout. The 
valid range is 1–255. The factor number is divided into the hello time-
out to determine the hello interval value.

By default, the hello time is set to 15 seconds and the factor number is set to 3, which results in a default 
hello interval time of 5 seconds.

OmniSwitch 9000E

• Use the no form of this command to set the hello timeout and factor parameters to the default values 

for these parameters. Note that if an interface name is specified with the no form of this command, the 
default values applied are the values defined globally for all interfaces.

• Use the optional interface ip-intf-name parameter to configure the hello time and hello interval for a 

specific LDP interface. Note that the hello parameter values configured for an interface override the 
global configuration of these values for the router.

• LDP uses hello messages to establish adjacencies with LDP peers. If no hello messages are received 

from a peer during the hello time that is advertised by that peer, the local LDP router will consider the 
peer as down and will not retain the adjacency with that peer.

• When LDP is establishing an adjacency between two peers, the hold time is negotiated to the lower 

time value of the two peers. Once an operational value is agreed upon, the hold time is divided by the 
factor number to determine the interval at which the peers will send each other hello messages.

All LDP interfaces.