Label Distribution Protocol
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MPLS Guide
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5.4 LDP IPv6
The 7705 SAR extends the LDP control plane and data plane to support LDP IPv6
adjacencies and sessions using 128-bit LSR ID.
The implementation allows for concurrent support of independent LDP IPv4 (which
uses a 32-bit LSR ID) and LDP IPv6 adjacencies and sessions between peer LSRs
and over the same interfaces or different set of interfaces.
Figure 32 shows an example of an LDP adjacency and session over an IPv6
interface.
Figure 32 LDP Adjacency and Session over an IPv6 Interface
LSR-A and LSR-B have the following IPv6 LDP identifiers respectively:
• <LSR Id=A/128> : <label space id=0>
• <LSR Id=B/128> : <label space id=0>
By default, LSR-A/128 and LSR-B/128 use the system interface IPv6 address.
Although the LDP control plane can operate using only the IPv6 system address, it
is recommended that the user must configure the IPv4-formatted router ID in order
for OSPF, IS-IS, and BGP to operate properly.
The following sections describe LDP IPv6 behavior on the 7705 SAR:
• Link LDP
• Targeted LDP
• FEC Resolution
• LDP Session Capabilities
• LDP Adjacency Capabilities
• IP Address and FEC Distribution
• IGP and Static Route Synchronization with LDP
• BFD Operation
Interface 2
LSR-A:0 LSR-B:0
Interface 1
27908
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