Configuring ORF capability for Neighbors

By default, Outbound Route Filtering (ORF) capability is disabled. ORF send capability or receive capability or both can be enabled via configuration. For a successful negotiation of ORF capability, one peer should have advertised ORF send capability, and the other one should have advertised ORF receive capability.

The figure shown below depicts the topology setup used for this configuration.

Figure 1. BGP Configuration and Testing Topology


  1. To enable BGP routing:

    Execute the following commands:

    Enabling BGP in Router R1
    • Enter the Global Configuration Mode.
    iS5comm# configure terminal
    • Enter the Autonomous System (AS) number in R1.
    iS5comm(config)# as-num 100
    • Configure the router-id in R1.
    iS5comm(config)# router-id 12.0.0.1
    • Enable BGP in R1.
    iS5comm(config)# router bgp 100
    • Configure R2 (with as-num 200) as external peer in R1.
    iS5comm(config-router)# neighbor 12.0.0.2 remote-as 200
    • Configure ORF send capability for the peer R2.
    iS5comm(config-router)# neighbor 12.0.0.2 capability orf prefix-list send

    Enabling BGP in Router R2
    • Enter the Global Configuration Mode.
    iS5comm# configure terminal
    • Enter the Autonomous System (AS) number in R1.
    iS5comm(config)# as-num 200
    • Configure the router-id in R1.
    iS5comm(config)# router-id 12.0.0.2
    • Enable BGP in R1.
    iS5comm(config)# router bgp 200
    • Configure R1 (with as-num 100) as external peer in R2.
    iS5comm(config-router)# neighbor 12.0.0.1 remote-as 100
    • Configure ORF send capability for the peer R1.
    iS5comm(config-router)# neighbor 12.0.0.1 capability orf prefix-list receive

  2. R1: View the output using the show command mentioned below.

    Type the following:

    iS5comm# show ip bgp neighbor
    BGP neighbor is 12.0.0.2, remote AS 200, internal link
    BGP version 4, remote router ID 12.0.0.2
    BGP state = Established, up for 2 minutes 43 seconds, un-authenticated session
    Configured BGP Maximum Prefix Limit 100
    Configured Connect Retry Count 5
    Current Connect Retry Count 0
    Peer Passive : DISABLED
    Peer Status : NOT DAMPED  
    Route map for incoming advertisements is INRMAP
    Route map for outgoing advertisements is RMAP
    Rcvd update before 0 secs, hold time is 90, keepalive interval is 30 secs
    Neighbors Capability:
    Route-Refresh: Advertised and received
    Address family IPv4 Unicast: Advertised and received
    Address family IPv4 Unicast: Advertised and received
    AF-dependant capabilities:
    Outbound Route Filter (ORF) type : (64) Address Prefix based ORF
    Send-mode : advertised
    Receive-mode : received
    Received 7 messages, 0 Updates
    Sent 7 messages, 1 Updates
    Route refresh: Received 0, sent 0.
    Minimum time between advertisement runs is 5 seconds
    Connections established 1 time(s)
    Local host: 12.0.0.1, Local port: 179
    Foreign host: 12.0.0.2, Foreign port: 49152
    Last Error: Code 0, SubCode 0.

  3. R2: View the output using the show command mentioned below.

    Type the following:

    iS5comm# show ip bgp neighbor
    BGP neighbor is 12.0.0.1, remote AS 100, internal link
    BGP version 4, remote router ID 12.0.0.1
    BGP state = Established, up for 7 minutes 45 seconds, un-authenticated session
    Configured BGP Maximum Prefix Limit 10
    AutomaticStart DISABLED
    AutomaticStop DISABLED
    DampPeer Oscillations DISABLED
    DelayOpen DISABLED
    Configured Connect Retry Count 5
    Current Connect Retry Count 0
    Default-originate : DISABLED
    Peer Passive : DISABLED
    Peer Status : NOT DAMPED
    GateWay Address : NONE
    Rcvd update before 0 secs, hold time is 90, keepalive interval is 30 secs
    Neighbors Capability:
    Route-Refresh: Advertised and received
    4-byte ASN: Advertised and received
    Address family IPv4 Unicast: Advertised and received
    AF-dependant capabilities:
    Outbound Route Filter (ORF) type : (64) Address Prefix based ORF
    Send-mode : received
    Receive-mode : advertised
    Received 17 messages, 0 Updates
    Sent 17 messages, 0 Updates
    Route refresh: Received 1, sent 0.
    Minimum time between advertisement runs is 5 seconds
    Connections established 4 time(s)
    Local host: 12.0.0.2, Local port: 179
    Foreign host: 12.0.0.1, Foreign port: 65115
    Last Error: Code 6, SubCode 0.
    Update Source 12.0.0.2
    Next-Hop is automatic
    MultiHop Status - disabled
    Send-Community is standard,extended
Parent topic: BGP Configuration