Cisco NCS 5500 Series

IS-IS Policy Attach Points
This section describes each of the IS-IS policy attach points and provides a summary of the IS-IS attributes
and operators.
Default-Information Originate
The default-information originate attach point within IS-IS allows the default route 0.0.0.0/0 to be conditionally
injected into the IS-IS route database.
The following example shows how to generate an IPv4 unicast default route if any of the routes that match
10.0.0.0/8 ge 8 le 25 is present in the RIB. The cost of the IS-IS route is set to 100 and the level is set to
level-1-2 on the default route that is injected into the IS-IS database.
route-policy isis-originate
if rib-has-route in (10.0.0.0/8 ge 8 le 25) then
set metric 100
set level level-1-2
endif
end-policy
router isis instance_10
address-family ipv4 unicast
default-information originate policy isis_originate
.
Inter-area-propagate
The inter-area-propagate attach point within IS-IS allows the prefixes to be conditionally propagated from
one level to another level within the same IS-IS instance.
The following example shows how to allow prefixes to be leaked from the level 1 LSP into the level 2 LSP
if any of the prefixes match 10.0.0.0/8 ge 8 le 25.
route-policy isis-propagate
if destination in (10.0.0.0/8 ge 8 le 25) then
pass
endif
end-policy
router isis instance_10
address-family ipv4 unicast
propagate level 1 into level 2 policy isis-propagate
.
Inter-area-propagate
The inter-area-propagate attach point within IS-IS allows the prefixes to be conditionally propagated from
one level to another level within the same IS-IS instance.
The following example shows how to allow prefixes to be leaked from the level 1 LSP into the level 2 LSP
if any of the prefixes match 10.0.0.0/8 ge 8 le 25.
route-policy isis-propagate
if destination in (10.0.0.0/8 ge 8 le 25) then
pass
Routing Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.3.x
182
Implementing Routing Policy
IS-IS Policy Attach Points