Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 240)

216 Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide
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MPLS LDP-IGP synchronization
1
• LDP determines convergence (receipt of all labels) for a link by 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 42 Example with LDP IGP synchronization
To enable LDP-IGP synchronization on each interface that belongs to an OSPF or IS-IS process,
enter the isis ldp sync or the ip ospf ldp sync command under the corresponding mode. When the
user does not want all of the interfaces to have LDP-IGP synchronization enabled, issue the [no]
form of the command on the specific interfaces.
When the LDP peer is reachable, the IGP waits indefinitely (by default) for synchronization to be
achieved. To limit the length of time the IGP session must wait, enter the mpls ldp igp sync
holddown command. 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.
• When enabled on IS-IS, the feature applies to both level-1 and level-2 metrics.
• Affects IPv4 metrics only.