Label Distribution Protocol
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MPLS Guide
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5.2 LDP Point-to-Multipoint Support
The 7705 SAR supports point-to-multipoint mLDP. This section contains information
on the following topics:
• LDP Point-to-Multipoint Configuration
• LDP Point-to-Multipoint Protocol
• Make-Before-Break (MBB)
• ECMP Support
• Inter-AS Non-segmented mLDP
• Intra-AS Non-segmented mLDP
5.2.1 LDP Point-to-Multipoint Configuration
A node running LDP also supports point-to-multipoint LSP setup using LDP. By
default, the node advertises the capability to a peer node using the point-to-multipoint
capability TLV in LDP initialization message.
The multicast-traffic configuration option (per interface) restricts or allows the use
of an interface for LDP multicast traffic forwarding towards a downstream node. The
interface configuration option does not restrict or allow the exchange of the point-to-
multipoint FEC by way of an established session to the peer on an interface, but only
restricts or allows the use of next hops over the interface.
5.2.2 LDP Point-to-Multipoint Protocol
Only a single generic identifier range is defined for signaling a multipoint data tree
(MDT) for all client applications. Implementation on the 7705 SAR reserves the range
1 to 8292 for generic point-to-multipoint LSP ID values for static point-to-multipoint
LSP on the root node.
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