Alcatel-Lucent 7450 Manual page 222

MPLS Commands
Once the primary path of the LSP is set up and is operationally up, any subsequent changes to the
SRLG group membership of an interface the primary path is using would not be considered by the
MPLS/RSVP task at the PLR for bypass/detour association until the next opportunity the primary
path is re-signaled. The path may be re-signaled due to a failure or to a make-before break operation.
Make-before break occurs as a result of a global revertive operation, a timer based or manual re-
optimization of the LSP path, or a user change to any of the path constraints.
Once the bypass or detour path is setup and is operationally UP, any subsequent changes to the SRLG
group membership of an interface the bypass/detour path is using would not be considered by the
MPLS/RSVP task at the PLR until the next opportunity the association with the primary LSP path is
re-checked. The association is re-checked if the bypass path is re-optimized. Detour paths are not re-
optimized and are re-signaled if the primary path is down.
Enabling or disabling srlg-frr only takes effect at the next opportunity the LSP paths are resignaled.
The user can wait for the resignal timer to expire or can cause the paths to be resignaled immediately
by executing at the ingress LER the tools perform router mpls resignal command. Note that in
order to force the dynamic bypass LSP to be resignaled using the SRLG constraint of the primary
paths it is associated with, it is recommend to first disable dynamic bypass LSPs on the system using
the "configure router mpls dynamicbypass" command, then manually resignal the LSP paths using
the above tools perform command finally re-enable dynamic bypass LSPs on the system. Before
performing this procedure, the user must ensure that no dynamic bypass LSP on the node is active to
avoid causing the primary LSP path to go down.
An RSVP interface can belong to a maximum of 64 SRLG groups. The user configures the SRLG
groups using the command config>router>mpls>srlg-group. The user configures the SRLG groups
an RSVP interface belongs to using the srlg-group command in the config>router>mpls>interface
context.
The no form of the command reverts to the default value.
Default no srlg-frr
Parameters strict — Specifies the name of the SRLG group within a virtual router instance.
srlg-group
Syntax [no] srlg-group group-name [group-name...(up to 5 max)]
no srlg-group
Context config>router>interface>if-attribute
config>service>ies>interface>if-attribute
config>service>vprn>interface>if-attribute
config>router>mpls>interface
Description
This command configures the SRLG membership of an interface. The user can apply SRLGs to an
IES, VPRN, network IP, or MPLS interface.
An interface can belong to up to 64 SRLG groups. However, each single operation of the srlg-group
command allows a maximum of five (5) groups to be specified at a time. Once an SRLG group is
bound to one or more interface, its value cannot be changed until all bindings are removed.
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Values no slr-frr (default)
srlg-frr (non-strict)
srlg-frr strict (strict)
7450 ESS MPLS Guide