R0106-HP MSR Router Series MPLS Command Reference(V7)

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Parameters
level-1: Specifies Level-1 of the IS-IS process.
level-2: Specifies Level-2 of the IS-IS process.
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 function 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 IS-IS process that belongs to a VPN instance.
If you do not specify any options for the command, the command enables LDP-ISIS synchronization for
both Level-1 and Level-2.
If you use this command multiple times, the most recent configuration takes effect. For example, if you
execute the mpls ldp sync level-1 command after you execute the mpls ldp sync command, LDP-ISIS
synchronization is enabled for Level-1 but disabled for Level-2.
Examples
# Enable LDP-ISIS synchronization for Level-2 of IS-IS process 1.
<Sysname> system-view
[Sysname] isis 1
[Sysname-isis-1] mpls ldp sync level-2
Related commands
• display mpls ldp igp sync
• igp sync delay
• igp sync delay on-restart
• mpls ldp igp sync disable
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