Cisco NCS 6000 Series Configuration Manual page 430

Dampening
This example shows how to set a route-policy "add-path-policy" to be used for enabling selection of additional
paths:
router bgp 100
address-family ipv4 unicast
additional-paths selection route-policy add-path-policy
Dampening
The dampening attach point controls the default route-dampening behavior within BGP. Unless overridden
by a more specific policy on the associate peer, all routes in BGP apply the associated policy to set their
dampening attributes.
The following policy sets dampening values for BGP IPv4 unicast routes. Those routes that are more specific
than a /25 take longer to recover after they have been dampened than routes that are less specific than /25.
route-policy sample_damp
end-policy
router bgp 2
Default Originate
The default originate attach point allows the default route (0.0.0.0/0) to be conditionally generated and
advertised to a peer, based on the presence of other routes. It accomplishes this configuration by evaluating
the associated policy against routes in the Routing Information Base (RIB). If any routes pass the policy, the
default route is generated and sent to the relevant peer.
The following policy generates and sends a default-route to the BGP neighbor 10.0.0.1 if any routes that match
10.0.0.0/8 ge 8 le 32 are present in the RIB.
route-policy sample-originate
end-policy
router bgp 2
Routing Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
408
if destination in (0.0.0.0/0 ge 25) then
set dampening halflife 30 others default
else
set dampening halflife 20 others default
endif
address-family ipv4 unicast
bgp dampening route-policy sample_damp
.
.
.
if rib-has-route in (10.0.0.0/8 ge 8 le 32) then
pass
endif
neighbor 10.0.0.1
remote-as 3
address-family ipv4 unicast
default-originate route-policy sample-originate
.
.
.
Implementing Routing Policy