IP Router Configuration Command Reference
198 Router Configuration Guide
if-attribute
Syntax if-attribute
Context config>router
config>router>interface
config>service>ies>interface
config>service>vprn>interface
Description This command creates the context to configure or apply IP interface attributes such as administrative
group (admin-group) or Shared Risk Loss Group (SRLG).
admin-group
Syntax admin-group group-name value group-value
no admin-group group-name
Context config>router>if-attribute
Description This command defines an administrative group (admin-group) that can be associated with an IP or
MPLS interface.
Admin groups, also known as affinity, are used to tag IP and MPLS interfaces that share a specific
characteristic with the same identifier. For example, an admin group identifier can represent all links
that connect to core routers, or all links that have a bandwidth higher than 10G, or all links that are
dedicated to a specific service.
The user first configures locally on each router the name and identifier of each admin group. A
maximum of 32 admin groups can be configured per system.
The user then configures the admin group membership of an interface. The user can apply admin
groups to a IES, VPRN, network IP, or MPLS interface.
When applied to MPLS interfaces, the interfaces can be included or excluded in the LSP path definition
by inferring the admin-group name. CSPF will compute a path that satisfies the admin-group include
and exclude constraints.
When applied to IES, VPRN, or network IP interfaces, the interfaces can be included or excluded in
the route next-hop selection by inferring the admin-group name in a route next-hop policy template
applied to an interface or a set of prefixes.
The following provisioning rules are applied to admin group configuration. The system will reject the
creation of an admin-group if it re-uses the same name but with a different group value than an existing
group. The system will also reject the creation of an admin-group if it re-uses the same group value but
with a different name than an existing group.
Only the admin groups bound to an MPLS interface are advertised area-wide 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.
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