MPLS Guide Label Distribution Protocol
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Figure 25 mLDP FEC for Inter-AS with Recursive Opaque Value
As shown in Figure 25, the root “10.0.0.21” is an ASBR and the opaque value
contains the original mLDP FEC. Therefore, in the leaf AS where the actual root
“10.0.0.14” is not known, the LDP FEC can be routed using the local root of ASBR.
When the FEC arrives at an ASBR that is colocated in the same AS as the actual
root, an LDP FEC with transit IPv4 opaque is generated.
Figure 26 shows an end-to-end example of a non-VPN mLDP with recursive opaque
for inter-AS.
sw1302
PE-2
(LEAF)
10.0.0.8
SAR Core AS3 SAR Core AS1
IGP, iBGP, mLDP
Host
Source
Join S1, G1
PIM Join
(S1, G1)
LDP Fec: Root 10.0.0.21
Opaque <Root 10.0.0.14,
Opaque <S1, G1>>
LDP Fec: Root 10.0.0.2
Opaque <Root 10.0.0.14,
Opaque <S1, G1>>
LDP Fec:
Root 10.0.0.14
Opaque <S1, G1>
PIM Join
(S1, G1)
S1, G1
10.60.3.2, 192.0.2.60
IGP, iBGP, mLDP
eBGP, mLDP
ASBR-3
10.0.0.21
ASBR-1
10.0.0.2
PE-1
(ROOT-1)
10.0.0.14
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