Frr Terminology; Table 6 Frr Terminology - Nokia 7705 SAR-W Series Manual

MPLS and RSVP-TE
The 7705 SAR uses CSPF to calculate the explicit route and dynamically signal the
FRR LSP.
With facility backup mode, routers check the contents of the Record Route Object
(RRO) in the received RESV message to determine the bypass tunnel endpoint in
the FRR facility. For link protection, the router uses the RRO to check the IP address
of the next-hop router attached to the far end of the link along with the label allocation
information and to build the bypass tunnel. This label is preserved until the LSP is
merged at the MP. For node protection, the router uses the RRO to determine the
next-next-hop router and the label it is expecting. The collection of RRO information
is enabled through the record and record-label options.
If, after this process, another LSP requests FRR using the facility backup method,
the router checks and compares its session object to the existing session objects and
if there is a match, the router binds that LSP to the same bypass tunnel. If there is no
match, another bypass is created.

3.7.1 FRR Terminology

Table 6
Table 6
70
provides definitions of terms used for FRR.
FRR Terminology
Term
Backup path
Backup tunnel
Bypass tunnel
CSPF
Detour route
Use subject to Terms available at: www.nokia.com
Definition
The LSP that is responsible for backing up a protected LSP. A
backup path can be a backup tunnel (facility backup) or a detour
LSP (one-to-one backup).
The LSP that is used to back up one of the many LSPs in FRR
facility (many-to-one) backup
An LSP that is used to protect a set of LSPs passing over a
common facility in FRR facility backup. A bypass tunnel can be
configured manually or dynamically (see
Bypass LSPs).
Constraint-based shortest path first
Any alternate route that protects the primary path, such as a
secondary path, FRR bypass tunnel, or FRR detour LSP. The
term "detour route" should not be confused with the term "detour
LSP". 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.
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