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MPLS Guide
FRR Bypass Tunnel or Detour LSP SRLG Disjoint Configuration
Manually configured bypasses that do not use CSPF are not considered as possible
backup paths.
Disjoint Primary and Secondary LSPs
Figure 10
A
A-B
SRLG_1
E
Legend:
Primary path
Secondary path taking SRLG_1 into account
3HE 18686 AAAB TQZZA
• Create an SRLG-group (similar to creating an admin group).
• Link the SRLG-group to MPLS interfaces.
• Enable the strict option on the srlg-frr command, which is a system-wide
command that forces the CSPF calculation for every LSP path to take any
configured SRLG memberships into account.
• Configure primary FRR (facility backup or one-to-one backup) LSP paths. Each
PLR will create a bypass or detour LSP that will only avoid the SRLG
memberships configured on the primary LSP path egress interface. For one-to-
one backup, detour-detour merging is out of the control of the PLR. The PLR will
not ensure that the FRR detour will be prohibited from merging with a colliding
detour LSP. For facility backup, given that there are several bypass types to bind
to, the priority rules shown in
B
SRLG_1
F
Use subject to Terms available at: www.nokia.com
Disjoint and Non-disjoint Paths
C
B-C
G
H
© 2022 Nokia.
MPLS and RSVP-TE
are used.
D
C-D
SRLG_1
J
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