Enables outbound route filter (ORF) capability exchange and advertise ORF capabilities to a BGP peer,
ORF, or outbound route filtering, is the technique that allows a BGP peer to “push” a filter to the remote neighbor. The neighbor then applies the prefix filter to the outbound updates sent to the peer that pushed the filter. This feature is particularly helpful in situations where BGP peers exchange large amounts of BGP information.
Send and receive capabilities to minimize the number of BGP updates that are sent between BGP peers.
BGP peering sessions must be established, and BGP ORF capabilities must be enabled on each participating router before prefix-based ORF announcements can be sent or received.
we see all the 10.x prefixes advertised by R5 are being learned by R1
Configure both the routers Capability to send and receive the prefix
R1(config-router)#neighbor 15.1.1.5 capability orf prefix-list send
R5(config-router)#neighbor 15.1.1.1 capability orf prefix-list receive
we will create a prefix list on R1 so that it can only receive the prefix 10.0.0.0/24 and 10.0.1.0/24
R1#
ip prefix-list ALLOW-PREFIX seq 10 permit 10.0.0.0/24
ip prefix-list ALLOW-PREFIX seq 20 permit 10.0.1.0/24
!
router bgp 123
no synchronization
bgp log-neighbor-changes
network 1.1.1.0 mask 255.255.255.0
neighbor 12.1.1.2 remote-as 123
neighbor 12.1.1.2 next-hop-self
neighbor 12.1.1.2 send-community
neighbor 13.1.1.3 remote-as 123
neighbor 13.1.1.3 next-hop-self
neighbor 13.1.1.3 send-community
neighbor 15.1.1.5 remote-as 500
neighbor 15.1.1.5 capability orf prefix-list send
neighbor 15.1.1.5 prefix-list ALLOW-PREFIX in
no auto-summary
!
R5#show ip bgp neighbors 15.1.1.1
For address family: IPv4 Unicast
BGP table version 162, neighbor version 162/0
Output queue size : 0
Index 1, Offset 0, Mask 0x2
1 update-group member
Inbound soft reconfiguration allowed
Community attribute sent to this neighbor
AF-dependant capabilities:
Outbound Route Filter (ORF) type (128) Prefix-list:
Send-mode: received
Receive-mode: advertised
Outbound Route Filter (ORF): received (2 entries)
Outbound path policy configured
ORF, or outbound route filtering, is the technique that allows a BGP peer to “push” a filter to the remote neighbor. The neighbor then applies the prefix filter to the outbound updates sent to the peer that pushed the filter. This feature is particularly helpful in situations where BGP peers exchange large amounts of BGP information.
Send and receive capabilities to minimize the number of BGP updates that are sent between BGP peers.
BGP peering sessions must be established, and BGP ORF capabilities must be enabled on each participating router before prefix-based ORF announcements can be sent or received.
we see all the 10.x prefixes advertised by R5 are being learned by R1
Configure both the routers Capability to send and receive the prefix
R1(config-router)#neighbor 15.1.1.5 capability orf prefix-list send
R5(config-router)#neighbor 15.1.1.1 capability orf prefix-list receive
we will create a prefix list on R1 so that it can only receive the prefix 10.0.0.0/24 and 10.0.1.0/24
R1#
ip prefix-list ALLOW-PREFIX seq 10 permit 10.0.0.0/24
ip prefix-list ALLOW-PREFIX seq 20 permit 10.0.1.0/24
!
router bgp 123
no synchronization
bgp log-neighbor-changes
network 1.1.1.0 mask 255.255.255.0
neighbor 12.1.1.2 remote-as 123
neighbor 12.1.1.2 next-hop-self
neighbor 12.1.1.2 send-community
neighbor 13.1.1.3 remote-as 123
neighbor 13.1.1.3 next-hop-self
neighbor 13.1.1.3 send-community
neighbor 15.1.1.5 remote-as 500
neighbor 15.1.1.5 capability orf prefix-list send
neighbor 15.1.1.5 prefix-list ALLOW-PREFIX in
no auto-summary
!
R5#show ip bgp neighbors 15.1.1.1
For address family: IPv4 Unicast
BGP table version 162, neighbor version 162/0
Output queue size : 0
Index 1, Offset 0, Mask 0x2
1 update-group member
Inbound soft reconfiguration allowed
Community attribute sent to this neighbor
AF-dependant capabilities:
Outbound Route Filter (ORF) type (128) Prefix-list:
Send-mode: received
Receive-mode: advertised
Outbound Route Filter (ORF): received (2 entries)
Outbound path policy configured
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