Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 377)

Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide 353
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MPLS LDP-IGP synchronization
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The MPLS LDP-IGP synchronization feature provides the following benefits:
• Provides a means to synchronize LDP and IGPs to minimize MPLS packet loss.
• MPLS LDP-IGP synchronization may be enabled per interface, or globally
• OSPF and IS-IS are supported for the IGP; each operates independently
• LDP determines convergence (receipt of all labels) for a link through one of two methods.
- Receive Label silence mechanism
- End Of Lib mechanism (RFC 5919)
• Provides a means to disable LDP-IGP synchronization on interfaces that the user does not want
enabled.
• Enables the user to globally enable LDP-IGP synchronization on each interface associated with
an IGP Open Shortest Path First (OSPF) or IS-IS process.
FIGURE 46 Example with LDP IGP synchronization
To enable LDP-IGP synchronization on each interface that belongs to an OSPF or IS-IS process,
enter the ldp-sync command. When the user does not want all of the interfaces to have LDP-IGP
synchronization enabled, issue the no ldp-sync command on the specific interfaces.
To specify how long an IGP must wait for LDP synchronization to be achieved, enter the ldp-sync
holddown command in the global configuration mode. When the LDP peer is not reachable, the IGP
establishes the adjacency to enable the LDP session to be established.
When an IGP adjacency is established on a link but LDP-IGP Synchronization is not yet achieved or
is lost, the IGP advertises the max-metric on that link.
Configuration considerations
• Supports only point-to-point interfaces but not tunnel interfaces.
• On IS-IS, wide metric-style is required.