The LFA SPF policy feature generalizes the use of admin-group and SRLG to other types of interfaces. To that end, it is important that the IP admin groups and SRLGs be compatible with the ones already supported in MPLS. The following rules are implemented.
The binding of an MPLS interface to a group, that is, configuring membership of an MPLS interface in a group, is performed under config>router>mpls>interface context.
The binding of a local or remote MPLS interface to an SRLG in the SRLG database is performed under the config>router>mpls>srlg-database context.
The binding of an IS-IS/OSPF interface to a group is performed in the config>router>if>if-attribute or config>service>vprn>if>if-attribute or config>service>ies>if>if-attribute contexts. This is used by IS-IS or OSPF in route next hop policies.
Only the admin groups and SRLGs bound to an MPLS interface context or the SRLG database context are advertised in TE link TLVs and sub-TLVs when the traffic-engineering option is enabled in IS-IS or OSPF. IES and VPRN interfaces do not have their attributes advertised in TE TLVs.