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ldp-synchronization

Syntax

ldp-synchronization {disable;hold-time seconds;}

Hierarchy Level

[edit logical-systems logical-system-name protocols isis interface interface-name],[edit logical-systems logical-system-name routing-instances routing-instance-name protocols isis interface interface-name],[edit protocols isis interface interface-name],[edit routing-instances routing-instance-name protocols isis interface interface-name]

Release Information

Statement introduced in Junos OS Release 7.5.

Description

Enable synchronization by advertising the maximum cost metric until LDP is operational on the link.

LDP distributes labels in non-traffic-engineered applications. Labels are distributed along the best path determined by IS-IS. If the synchronization between LDP and IS-IS is lost, the label-switched path (LSP) goes down. Therefore, IS-IS and LDP synchronization is beneficial. When LDP synchronization is configured and when LDP is not fully operational on a given link (a session is not established and labels are not exchanged), IS-IS advertises the link with the maximum cost metric. The link is not preferred but remains in the network topology.

LDP synchronization is supported only on point-to-point interfaces and LAN interfaces configured as point-to-point interfaces under IS-IS. LDP synchronization is not supported during graceful restart.

To advertise the maximum cost metric until LDP is operational for LDP synchronization, include the ldp-synchronization statement.

The remaining statements are explained separately.

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.

 

Related Documentation

 

Published: 2013-07-22

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