MPLS Commands
Page 116 7210 SAS M, T, X, R6, Mxp MPLS Configuration
Guide
resignal-timer
Syntax resignal-timer minutes
no resignal-timer
Context config>router>mpls
Description This command specifies the value for the LSP resignal timer. The resignal timer is the time, in
minutes, the software waits before attempting to resignal the LSPs.
When the resignal timer expires, if the new computed path for an LSP has a better metric than the
current recorded hop list, an attempt is made to resignal that LSP using the make-before-break
mechanism. If the attempt to resignal an LSP fails, the LSP will continue to use the existing path and
a resignal will be attempted the next time the timer expires.
The no form of the command disables timer-based LSP resignalling.
Default no resignal-timer
Parameters minutes — The time the software waits before attempting to resignal the LSPs.
Values 30 — 10080
srlg-frr
Syntax srlg-frr [strict]
no srlg-frr
Context config>router>mpls
Description This command enables the use of the Shared Risk Link Group (SRLG) constraint in the computation
of FRR bypass or detour to be associated with any primary LSP path on this system.
When this option is enabled, CSPF includes the SRLG constraint in the computation of a FRR detour
or bypass for protecting the primary LSP path.
CSPF prunes all links with interfaces which belong to the same SRLG as the interface which is being
protected, i.e., the outgoing interface at the PLR the primary path is using. If one or more paths are
found, the MPLS/RSVP task will select one based on best cost and will signal the bypass/detour. If
not and the user included the strict option, the bypass/detour is not setup and the MPLS/RSVP task
will keep retrying the request to CSPF. Otherwise, if a path exists which meets the other TE
constraints, other than the SRLG one, the bypass/detour is setup.
A bypass or a detour LSP path is not guaranteed to be SRLG disjoint from the primary path. This is
because only the SRLG constraint of the outgoing interface at the PLR the primary path is using is
checked.
When the MPLS/RSVP task is searching for a SRLG bypass tunnel to associate with the primary path
of the protected LSP, it will first check if any configured manual bypass LSP with CSPF enabled
satisfies the SLRG constraints. The MPLS/RSVP skips any non-CSPF bypass LSP in the search as
there is no ERO returned to check the SLRG constraint. If no path is found, it will check if an existing
dynamic bypass LSP satisfies the SLRG and other primary path constraints. If not, then it will make
a request to CSPF.
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