Static Configurations Of Srlg Memberships - Alcatel-Lucent 7950 SR User Configuration Manual

Advanced MPLS/RSVP Features

Static Configurations of SRLG Memberships

This feature provides operations with the ability to manually enter the link members of SRLG
groups for the entire network at any SR OS node which will need to signal LSP paths (for
example, a head-end node).
The operator may explicitly enables the use by CSPF of the SRLG database. In that case, CSPF
will not query the TE database for IGP advertised interface SRLG information.
Note, however, that the SRLG secondary path computation and FRR bypass/detour path
computation remains unchanged.
There are deployments where the SR OS will interoperate with routers that do not implement the
SRLG membership advertisement via IGP SRLG TLV or sub-TLV.
In these situations, the user is provided with the ability to enter manually the link members of
SRLG groups for the entire network at any SR OS node which will need to signal LSP paths, for
example, a head-end node.
The user enters the SRLG membership information for any link in the network by using the
interface ip-int-name srlg-group group-name command in the config>router>mpls> srlg-
database>router-id context. An interface can be associated with up to 5 SRLG groups for each
execution of this command. The user can associate an interface with up to 64 SRLG groups by
executing the command multiple times. The user must also use this command to enter the local
interface SRLG membership into the user SRLG database. The user deletes a specific interface
entry in this database by executing the no form of this command.
The group-name must have been previously defined in the SRLG srlg-group group-name value
group-value command in the config>router>mpls. The maximum number of distinct SRLG
groups the user can configure on the system is 1024.
The parameter value for router-id must correspond to the router ID configured under the base
router instance, the base OSPF instance or the base IS-IS instance of a given node. Note however
that a single user SLRG database is maintained per node regardless if the listed interfaces
participate in static routing, OSPF, IS-IS, or both routing protocols. The user can temporarily
disable the use by CSPF of all interface membership information of a specific router ID by
executing the shutdown command in the config>router>mpls> srlg-database> router-id
context. In this case, CSPF will assume these interfaces have no SRLG membership association.
The operator can delete all interface entries of a specific router ID entry in this database by
executing the no router-id router-address command in the config>router>mpls> srlg-database
context.
CSPF will not use entered SRLG membership if an interface is not listed as part of a router ID in
the TE database. If an interface was not entered into the user SRLG database, it will be assumed
that it does not have any SRLG membership. CSPF will not query the TE database for IGP
advertised interface SRLG information.
Page 92 7950 SR OS MPLS Configuration Guide