Alcatel-Lucent 7450 Manual page 164

RSVP Control Plane in a P2MP LSP
18. While make-before break is being performed on individual S2L sub-LSP paths, the P2MP
19. The MPLS data path of an LSR node, branch LSR node, and bud LSR node will be able to
20. Link-protect FRR bypass using P2P LSPs is supported. In link protect, the PLR protecting
21. Refresh reduction on RSVP interface and on P2P bypass LSP protecting one or more S2L
22. A manual bypass LSP cannot be used for protecting S2L paths of a P2MP LSP.
23. The following MPLS features do operate with P2MP LSP:
24. The following MPLS features are not operable with P2MP LSP:
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However, there will be a global MBB timer set to 600 seconds and which is not
configurable. If the global MBB succeeds, for example, all S2L MBBs have succeeded,
before the global timer expires, MPLS moves the all S2L sub-LSPs into their new path.
Otherwise when this timer expires, MPLS checks if all S2L paths have at least tried once.
If so, it then aborts the global MBB. If not, it will continue until all S2Ls have re-tried
once and then aborts the global MBB. Once global MBB is aborted, MPLS will move all
S2L sub-LSPs into the new paths only if the set of S2Ls with a new path found is a
superset of the S2Ls which have a current path which is up.
LSP will continue forwarding packets on S2L sub-LSP paths which are not being re-
optimized and on the older S2L sub-LSP paths for which make-before-break operation
was not successful. MBB will thus result in duplication of packets until the old path is torn
down.
re-merge S2L sub-LSP paths of the same P2MP LSP in case their ILM is on different
incoming interfaces and their NHLFE is on the same or different outgoing interfaces. This
could occur anytime there are equal cost paths through this node for the S2L sub-LSPs of
this P2MP LSP.
an interface to a branch LSR will only make use of a single P2P bypass LSP to protect all
S2L sub-LSPs traversing the protected interface.
sub-LSPs.
→ BFD on RSVP interface.
→ MD5 on RSVP interface.
→ IGP metric and TE metric for computing the path of the P2MP LSP with CSPF.
→ SRLG constraint for computing the path of the P2MP LSP with CSPF. SRLG is
supported on FRR backup path only.
→ TE graceful shutdown.
→ Admin group constraint.
→ Class based forwarding over P2MP RSVP LSP.
→ LDP-over-RSVP where the RSVP LSP is a P2MP LSP.
→ Diff-Serv TE.
→ Soft pre-emption of RSVP P2MP LSP.
7450 ESS MPLS Guide