orf route-policy policy-orf
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Next-hop
The next-hop attach point provides increased control based on protocol and prefix-based match operations.
The attach point is typically used to decide whether to act on a next-hop notification (up or down) event.
Support for next-hop tracking allows BGP to monitor reachability for routes in the Routing Information Base
(RIB) that can directly affect BGP prefixes. The route policy at the BGP next-hop attach point helps limit
notifications delivered to BGP for specific prefixes. The route policy is applied on RIB routes. Typically,
route policies are used in conjunction with next-hop tracking to monitor non-BGP routes.
The following example shows how to configure the BGP next-hop tracking feature using a route policy to
monitor static or connected routes with the prefix 10.0.0.0 and prefix length 8.
route-policy nxthp_policy_A
if destination in (10.0.0.0/8) and protocol in (static, connected) then
pass
endif
end-policy
router bgp 2
address-family ipv4 unicast
nexthop route-policy nxthp_policy_A
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Clear-Policy
The clear-policy attach point provides increased control based on various AS path match operations when
using a
clear bgp
command. This attach point is typically used to decide whether to clear BGP flap statistics
based on AS-path-based match operations.
The following example shows how to configure a route policy where the in operator evaluates to true if one
or more of the regular expression matches in the set my-as-set successfully match the AS path associated with
the route. If it is a match, then the
clear
command clears the associated flap statistics.
as-path-set my-as-set
ios-regex '_12$',
ios-regex '_13$'
end-set
route-policy policy_a
if as-path in my-as-set then
pass
else
drop
endif
end-policy
clear bgp ipv4 unicast flap-statistics route-policy policy_a
Routing Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
415
Implementing Routing Policy
Next-hop