Table of Contents
Advertisement
Label Distribution Protocol
For mLDP to be able to signal through a multiple-AS network where the intermediate
nodes do not have a routing path to the root, a recursive opaque value is needed.
The LDP FEC root resolves the local ASBR, and the recursive opaque value contains
the point-to-multipoint FEC element, encoded as specified in RFC 6513, with a type
field, a length field, and a value field of its own.
RFC 6826 section 3 defines the Transit IPv4 opaque for point-to-multipoint LDP FEC,
where the leaf in the local AS wants to establish an LSP to the root for point-to-
multipoint LSP.
Figure 24
Figure 25
398
Figure 24
shows FEC in this network configuration.
mLDP FEC for Single AS with Transit IPv4 Opaque
PE-2
(LEAF)
10.0.0.8
Join S1, G1
Host
PIM Join
(S1, G1)
Opaque <S1, G1>
shows an inter-AS FEC with recursive opaque based on RFC 6512.
© 2022 Nokia.
Use subject to Terms available at: www.nokia.com
PE-1
(ROOT-1)
10.0.0.14
IGP, eBGP, mLDP
10.60.3.2, 192.0.2.60
SAR Core AS1
LDP Fec:
PIM Join
Root 10.0.0.14
(S1, G1)
MPLS Guide
S1, G1
Source
sw1301
3HE 18686 AAAB TQZZA
Advertisement
Table of Contents
