MPLS Guide MPLS and RSVP-TE
3HE 18686 AAAB TQZZA © 2022 Nokia.
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Detour LSP The LSP that is used to reroute traffic around a failure in FRR
one-to-one backup. The term “detour LSP” should not be
confused with the term “detour route”. Detour route is a general
term that refers to any alternate route, while detour LSP is a
specific term that applies to one-to-one backup.
DMP Detour merge point
In the case of one-to-one backup, this is an LSR where multiple
detours converge. Only one detour is signaled beyond that LSR.
Disjoint See SRLG disjoint
Facility backup A local repair method in which a single bypass tunnel is used to
protect one or more LSPs that traverse the PLR, the resource
being protected, and the Merge Point (in that order). Facility
backup is distinct from a one-to-one backup tunnel, which has
one backup path per protected path.
MP Merge point
The LSR where one or more backup tunnels rejoin the path of
the protected LSP downstream of the potential failure. The same
LSR may be both an MP and a PLR simultaneously.
NHOP bypass tunnel Next-hop bypass tunnel
A backup tunnel that bypasses a single link of the protected LSP
NNHOP bypass tunnel Next-next-hop bypass tunnel
A backup tunnel that bypasses a single node of the protected
LSP
One-to-one backup A local repair method in which a backup LSP is separately
created for each protected LSP at a PLR
PLR Point of local repair
The head-end router of a backup tunnel or a detour LSP, where
the term local repair refers to techniques used to repair an LSP
tunnel quickly when a node or link along an LSP path fails
Primary path An LSP that uses the routers specified by the path defined by the
primary path-name command
Protected LSP An LSP is protected at a given hop if it has one or more
associated backup tunnels originating at that hop
Reroutable LSP Any LSP for which the head-end router requests local protection
Secondary path An LSP that protects a primary path that uses LSP redundancy
protection rather than FRR protection
Table 6 FRR Terminology (Continued)
Term Definition
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