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Latest post 04-11-2012 9:22 AM by Hasib. 3 replies.
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  • 03-29-2012 9:16 AM

    2.3 orf questions about direction

    Cisco documentation shows that the side of the connection with the route blocking, is configured for orf receive. The other side of the connection is configured for send. This is the way i configured the routers and it works. E.G.(r1 - send | r4 - receive)

    The SG is configured for the opposite (R1 - receive | R4 - send).

     

    I'm confused at which is the right way and why they both work.

     

     

     

    router bgp 200

     no synchronization

     bgp router-id 150.1.4.4

     bgp log-neighbor-changes

     neighbor 130.1.45.5 remote-as 200

     neighbor 130.1.124.1 remote-as 100

     neighbor 130.1.124.1 capability orf prefix-list receive

     neighbor 130.1.124.1 prefix-list BGP-FROM-R1 in

     neighbor 150.1.3.3 remote-as 200

     no auto-summary

    Rack1R4#sh ip bgp       

    BGP table version is 3, local router ID is 150.1.4.4

    Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

                  r RIB-failure, S Stale

    Origin codes: i - IGP, e - EGP, ? - incomplete

     

       Network          Next Hop            Metric LocPrf Weight Path

    *> 28.119.16.0/24   130.1.124.1                            0 100 54 i

    *> 28.119.17.0/24   130.1.124.1                            0 100 54 i

     

    Filed under: ,
    • Post Points: 20
  • 03-29-2012 10:16 AM In reply to

    Re: 2.3 orf questions about direction

    jguagliata:

    Cisco documentation shows that the side of the connection with the route blocking, is configured for orf receive. The other side of the connection is configured for send. This is the way i configured the routers and it works. E.G.(r1 - send | r4 - receive)

    The SG is configured for the opposite (R1 - receive | R4 - send).

    I'm confused at which is the right way and why they both work.

    SG has the correct way to apply orf. Here is the sample from the Cisco DoC

    http://www.cisco.com/en/US/docs/ios/iproute_bgp/command/reference/irg_bgp3.html#wp1105692

    Router-A Configuration (Sender)

    The following example creates an outbound route filter and configures Router-A (10.1.1.1) to advertise the filter to Router-B (172.16.1.2). An IP prefix list named FILTER is created to specify the 192.168.1.0/24 subnet for outbound route filtering. The ORF send capability is configured on Router-A so that Router-A can advertise the outbound route filter to Router-B.

    ip prefix-list FILTER seq 10 permit 192.168.1.0/24 
    
    !
    
    router bgp 100
    
     address-family ipv4 unicast 
    
     neighbor 172.16.1.2 remote-as 200
    
     neighbor 172.16.1.2 ebgp-multihop 
    
     neighbor 172.16.1.2 capability orf prefix-list send
    
     neighbor 172.16.1.2 prefix-list FILTER in
    
     exit 
    

    Router-B Configuration (Receiver)

    The following example configures Router-B to advertise the ORF receive capability to Router-A. Router-B will install the outbound route filter, defined in the FILTER prefix list, after ORF capabilities have been exchanged. An inbound soft reset is initiated on Router-B at the end of this configuration to activate the outbound route filter.

    router bgp 200
    
     address-family ipv4 unicast 
    
     neighbor 10.1.1.1 remote-as 100
    
     neighbor 10.1.1.1 ebgp-multihop 255
    
     neighbor 10.1.1.1 capability orf prefix-list receive
    
     end 
    
    clear ip bgp 10.1.1.1 in prefix-filter

     

    • Post Points: 20
  • 03-30-2012 8:30 AM In reply to

    Re: 2.3 orf questions about direction

    This is the cisco doc i was reading. It has it the opposite. The confusing part for me, is it works with the send and receive either way.

     

    http://www.cisco.com/en/US/docs/ios/12_2t/12_2t11/feature/guide/ft11borf.html#wp1036826

    • Post Points: 20
  • 04-11-2012 9:22 AM In reply to

    Re: 2.3 orf questions about direction

    you apply a prefix list filter inbound on a neighbor to block certain prefixes, ORF sends / advertises that prefix list to that neighbor which recieves it and applies the prefix-list outbound, therefore no longer advertising the blocked prefixes.

    • Post Points: 5
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