Application of route next hop policy template to an interface

After the route next hop policy template is configured with the needed policies, the user can apply it to all prefixes whose primary next hop uses a specific interface name. The following command achieves that.

CLI syntax:

config>router>isis>if>lfa-policy-map route-nh-template template-name
config>router>ospf(3)>area>if>lfa-policy-map route-nh-template template-name
config>service>vprn>ospf(3)>area>if>lfa-policy-map route-nh-template template-name

When a route next hop policy template is applied to an interface in IS-IS, it is applied in both level 1 and level 2. When a route next hop policy template is applied to an interface in OSPF, it is applied in all areas. However, the above CLI command in an OSPF interface context can only be executed under the area in which the specified interface is primary and then applied in that area and in all other areas where the interface is secondary. If the user attempts to apply it to an area where the interface is secondary, the command fails.

If the user excluded the interface from LFA using the command loopfree-alternate-exclude, the LFA policy if applied to the interface has no effect.

Finally, if the user applied a route next hop policy template to a loopback interface or to the system interface, the command is not rejected but it results in no action taken.