mpls ldp sync (OSPF view/OSPF area view)
Use mpls ldp sync to enable LDP-OSPF synchronization.
Use undo mpls ldp sync to disable LDP-OSPF synchronization.
Syntax
mpls ldp sync
undo mpls ldp sync
Default
LDP-OSPF synchronization is disabled.
Views
OSPF view
OSPF area view
Predefined user roles
network-admin
Usage guidelines
LDP establishes LSPs based on the IGP optimal route. If LDP is not synchronized with IGP, MPLS traffic forwarding might be interrupted. The LDP-IGP synchronization feature is used to solve the synchronization problem.
After LDP-IGP synchronization is enabled, IGP advertises the actual cost of a link only when LDP convergence on the link is completed. Before LDP is converged, IGP advertises the maximum cost of the link. As a result, the link is visible on the IGP topology, but IGP does not select the link as the optimal route when other links are available. In this way, the device can avoid discarding MPLS packets due to lack of LDP LSP on the optimal route.
LDP-IGP synchronization is not supported for an OSPF process and its OSPF areas if the OSPF process belongs to a VPN instance.
To enable LDP-OSPF synchronization for an OSPF area, use this command in OSPF area view. To enable LDP-OSPF synchronization for all areas of an OSPF process, use this command in OSPF view.
Examples
# Enable LDP-OSPF synchronization for OSPF process 1.
<Sysname> system-view [Sysname] ospf 1 [Sysname-ospf-1] mpls ldp sync
Related commands
display mpls ldp igp sync
igp sync delay
igp sync delay on-restart
mpls ldp igp sync disable