igp sync delay

Use igp sync delay to set the delay for LDP to notify IGP of the LDP convergence completion.

Use undo igp sync delay to restore the default.

Syntax

igp sync delay time

undo igp sync delay

Default

LDP immediately notifies IGP of the LDP convergence completion.

Views

LDP view

Predefined user roles

network-admin

Parameters

time: Specifies the notification delay in the range of 5 to 300 seconds.

Usage guidelines

LDP convergence on a link is completed when the following conditions exist:

• The local device establishes an LDP session to a minimum of one peer, and the LDP session is already in Operational state.

• The local device has distributed the label mappings to a minimum of one peer.

If LDP notifies IGP immediately after convergence, MPLS traffic forwarding might be interrupted in one of the following scenarios:

• LDP peers use the Ordered label distribution control mode. When LDP notifies IGP of the LDP convergence, the device has not received a label mapping from downstream.

• A large number of label mappings are distributed from downstream. When LDP notifies IGP of the LDP convergence completion, label advertisement is not completed.

In these scenarios, you must use the igp sync delay command to configure the notification delay. When LDP convergence on a link is completed, LDP waits a delay time before notifying IGP of the LDP convergence completion to reduce traffic interruption.

Examples

# Set a 30-second delay for LDP to notify IGP of the LDP convergence.

<Sysname> system-view
[Sysname] mpls ldp
[Sysname-ldp] igp sync delay 30

Related commands

igp sync delay on-restart

mpls ldp igp sync disable

mpls ldp sync (IS-IS view)

mpls ldp sync (OSPF view/OSPF area view)