Label Distribution Protocol
7450 ESS MPLS Guide Page 599
LDP IPv6 Control and Data Planes
SR OS extends the LDP control plane and data plane to support LDP IPv6 adjacency and session
using 128-bit LSR-ID.
The implementation allows for concurrent support of independent LDP IPv4 (32-bit LSR-ID) and
IPv6 (128-bit LSR-iD) adjacencies and sessions between peer LSRs and over the same or different
set of interfaces.
LDP Operation in an IPv6 Network
LDP IPv6 can be enabled on the SR OS interface. Figure 57 shows the LDP adjacency and session
over an IPv6 interface.
Figure 57: 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, A/128 and B/128 use the system interface IPv6 address.
Note that while the LDP control plane can operate using only the IPv6 system address, the user
will need to configure the IPv4-formatted router ID for OPSF, IS-IS, and BGP to operate properly.
The following sections describe the behavior when LDP IPv6 is enabled on the interface.
Link LDP
The SR OS LDP IPv6 implementation uses a 128-bit LSR-ID as defined in draft-pdutta-mpls-ldp-
v2-00. See LDP Process Overview for more information about interoperability of this
implementation with 32-bit LSR-ID, as defined in draft-ietf-mpls-ldp-ipv6-14.
al_0627
LSR-A:0
I/F 1
I/F 2
LSR-B:0
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