!
router bgp 100
address-family vpnv4 unicast
vrf all
label mode route-policy pass-all
!
!
vrf abc
rd 1:1
address-family ipv4 unicast
label mode route-policy set_label_mode
!
!
!
end
Neighbor-ORF
The neighbor-orf attach point provides the filtering of incoming BGP route updates using only prefix-based
matching. In addition to using this as an inbound filter, the prefixes and disposition (drop or pass) are sent to
upstream neighbors as an Outbound Route Filter (ORF) to allow them to perform filtering.
The following example shows how to configure a route policy orf-preset and apply it to the neighbor ORF
attach point. The prefix of the route is dropped if it matches any prefix specified in orf-preset (172.16.1.0/24,
172.16.5.0/24, 172.16.11.0/24). In addition to this inbound filtering, BGP also sends these prefix entries to
the upstream neighbor with a permit or deny so that the neighbor can filter updates before sending them on
to their destination.
prefix-set orf-preset
172.16.1.0/24,
172.16.5.0/24,
172.16.11.0/24
end-set
route-policy policy-orf
if orf prefix in orf-preset then
drop
endif
if orf prefix in (172.16.3.0/24, 172.16.7.0/24, 172.16.13.0/24) then
pass
endif
router bgp 2
neighbor 1.1.1.1
remote-as 3
address-family ipv4 unicast
orf route-policy policy-orf
.
.
.
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.
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
OL-30423-03 499
Implementing Routing Policy
Attach Points
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