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MPLS Guide
5.2.5.3
In
ASBR-5).
ECMP Support
Figure 29
PE-2
(LEAF)
10.0.0.8
IGP, iBGP, mLDP
SAR Core AS3
Host
VPRN-1
RD 600:600
Join S1, G1
The leaf chooses which ASBR will be used for the multicast stream using the
following process.
3HE 18686 AAAB TQZZA
ECMP Support
Figure
29, the leaf discovers ROOT-1 from all three ASBRs (ASBR-3, ASBR-4 and
ASBR-3
10.0.0.21
ASBR-4
10.0.0.22
ASBR-5
10.0.0.23
1. The leaf determines the number of ASBRs that should be part of the hash
calculation.
The number of ASBRs that are part of the hash calculation comes from the
ECMP value (configured with the config>router>ecmp command). For
example, if the ECMP value is set to 2, only two of the ASBRs will be part of the
hash algorithm selection.
2. After selecting the upstream ASBR, the leaf determines whether there are
multiple equal cost paths between it and the chosen ASBR.
- If there are multiple ECMP paths between the leaf and the ASBR, the leaf
performs another ECMP selection based on the configured ECMP value.
This is a recursive ECMP lookup.
- The first lookup chooses the ASBR and the second lookup chooses the path
to that ASBR.
For example, if ASBR 5 was chosen in
the leaf and ASBR-5. A second ECMP decision is therefore made to choose the
path.
Use subject to Terms available at: www.nokia.com
ASBR-1
10.0.0.2
eBGP, mLDP
ASBR-2
10.0.0.20
Figure
© 2022 Nokia.
Label Distribution Protocol
PE-1
(ROOT-1)
10.0.0.14
IGP, iBGP, mLDP
SAR Core AS1
Source
VPRN-1
RD 60:60
10.60.3.2, 192.0.2.60
29, there are three paths between
S1, G1
sw1300
403
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