IP Router Configuration Command Reference
202 Router Configuration Guide
Description This command creates a template to configure the attributes of a Loop-Free Alternate (LFA) Shortest
Path First (SPF) policy. An LFA SPF policy allows the user to apply specific criteria, such as admin
group and SRLG constraints, to the selection of an LFA backup next-hop for a subset of prefixes that
resolve to a specific primary next-hop.
The user first creates a route next-hop policy template under the global router context and then applies
it to a specific OSPF or IS-IS interface in the global routing instance or in a VPRN instance.
A policy template can be used in both IS-IS and OSPF to apply the specific criteria to prefixes
protected by LFA. Each instance of IS-IS or OSPF can apply the same policy template to one or more
interface.
The commands within the route next-hop policy template use the begin-commit-abort model. The
following are the steps to create and modify the template:
To create a template, the user enters the name of the new template directly under the route-next-hop-
policy context.
1. To delete a template that is not in use, the user enters the no form for the template name under
the route-next-hop-policy context.
2. The user enters the editing mode by executing the begin command under the route-next-hop-
policy context. The user can then edit and change any number of route next-hop policy
templates. However, the parameter value will still be stored temporarily in the template
module until the commit is executed under the route-next-hop-policy context. Any temporary
parameter changes will be lost if the user enters the abort command before the commit
command.
3. The user is allowed to create or delete a template instantly once in the editing mode without
the need to enter the commit command. Furthermore, the abort command, if entered, will
have no effect on the prior deletion or creation of a template.
Once the commit command is issued, IS-IS or OSPF will re-evaluate the templates and if there are any
net changes, it will schedule a new LFA SPF to re-compute the LFA next-hop for the prefixes
associated with these templates.
Parameters template-name — Specifies the name of the template, up to 32 characters.
include-group
Syntax include-group group-name [pref pref]
no include-group group-name
Context config>router>route-next-hop-policy>template
Description This command configures the admin group constraint into the route next-hop policy template.
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