Comments on: Understanding BGP Outbound Route Filtering (BGP ORF) http://blog.internetworkexpert.com/2008/05/05/understanding-bgp-outbound-route-filtering-bgp-orf/ Helping you become a Cisco Certified Internetwork Expert Fri, 05 Sep 2008 15:07:39 +0000 http://wordpress.org/?v=2.5.1 By: Marco http://blog.internetworkexpert.com/2008/05/05/understanding-bgp-outbound-route-filtering-bgp-orf/#comment-6601 Marco Sun, 24 Aug 2008 17:00:09 +0000 http://blog.internetworkexpert.com/2008/05/05/understanding-bgp-outbound-route-filtering-bgp-orf/#comment-6601 In every example provided by Cisco documentation, the soft reset is initiad on the receiver side. In your examples you insert this command on the sender side. Is this the same thing? THanks in advance. Marco In every example provided by Cisco documentation, the soft reset is initiad on the receiver side.

In your examples you insert this command on the sender side.

Is this the same thing?

THanks in advance.

Marco

]]> By: shahir basheer http://blog.internetworkexpert.com/2008/05/05/understanding-bgp-outbound-route-filtering-bgp-orf/#comment-5514 shahir basheer Thu, 07 Aug 2008 15:12:58 +0000 http://blog.internetworkexpert.com/2008/05/05/understanding-bgp-outbound-route-filtering-bgp-orf/#comment-5514 Hi Brain Thankyou for the excellent explanation on ORF and the time you spent for this topic.This highly helpful for me in undersrtanding the concept of ORF. Hi Brain Thankyou for the excellent explanation on ORF and the time you spent for this topic.This highly helpful for me in undersrtanding the concept of ORF.

]]> By: Brian McGahan, CCIE #8593 http://blog.internetworkexpert.com/2008/05/05/understanding-bgp-outbound-route-filtering-bgp-orf/#comment-3682 Brian McGahan, CCIE #8593 Thu, 26 Jun 2008 15:01:12 +0000 http://blog.internetworkexpert.com/2008/05/05/understanding-bgp-outbound-route-filtering-bgp-orf/#comment-3682 Hi Todd, The address-family in BGP is used to configure protocol specific information. It is made up of two fields in the BGP update, the AFI (address family identifier), and the SAFI (Sub-address family identifier). Since ORF is specific to one address family its options are configured under IPv4 (AFI) Unicast (SAFI). Also there is a default command "bgp default ipv4-unicast" in the global BGP process, so you can apply the ORF to the global process instead of the address-family. If you put it under the global process and then add another address-family, such as IPv6, the ORF config will automatically be moved to IPv4 unicast. Hi Todd,

The address-family in BGP is used to configure protocol specific information. It is made up of two fields in the BGP update, the AFI (address family identifier), and the SAFI (Sub-address family identifier). Since ORF is specific to one address family its options are configured under IPv4 (AFI) Unicast (SAFI). Also there is a default command “bgp default ipv4-unicast” in the global BGP process, so you can apply the ORF to the global process instead of the address-family. If you put it under the global process and then add another address-family, such as IPv6, the ORF config will automatically be moved to IPv4 unicast.

]]> By: Todd http://blog.internetworkexpert.com/2008/05/05/understanding-bgp-outbound-route-filtering-bgp-orf/#comment-3668 Todd Wed, 25 Jun 2008 22:41:25 +0000 http://blog.internetworkexpert.com/2008/05/05/understanding-bgp-outbound-route-filtering-bgp-orf/#comment-3668 Thank You for the excellent explanation. I do have a question about configuration of BGP ORF. I recently configured and successfully filter routes remotely using BGP ORF. The difference between my configuration and yours is the use of an address-family. I understand the concept and use of address families as it pertains to VRFs, but don't understand why it is need in this instance (since I have it working without it). Can you provide me any insight on when and where to use address-families? router bgp 3 no synchronization bgp router-id 4.4.4.4 bgp log-neighbor-changes network 204.12.1.0 neighbor 155.1.146.1 remote-as 2 neighbor 155.1.146.1 capability orf prefix-list send neighbor 155.1.146.1 prefix-list FROM_R1 in no auto-summary Thank You for the excellent explanation. I do have a question about configuration of BGP ORF. I recently configured and successfully filter routes remotely using BGP ORF. The difference between my configuration and yours is the use of an address-family. I understand the concept and use of address families as it pertains to VRFs, but don’t understand why it is need in this instance (since I have it working without it). Can you provide me any insight on when and where to use address-families?

router bgp 3
no synchronization
bgp router-id 4.4.4.4
bgp log-neighbor-changes
network 204.12.1.0
neighbor 155.1.146.1 remote-as 2
neighbor 155.1.146.1 capability orf prefix-list send
neighbor 155.1.146.1 prefix-list FROM_R1 in
no auto-summary

]]> By: ccie2x http://blog.internetworkexpert.com/2008/05/05/understanding-bgp-outbound-route-filtering-bgp-orf/#comment-2747 ccie2x Sun, 18 May 2008 12:46:29 +0000 http://blog.internetworkexpert.com/2008/05/05/understanding-bgp-outbound-route-filtering-bgp-orf/#comment-2747 Dear Brian This is the best illustration of BGP ORF that i have ever gone through, many thanks for sharing your knowledge in such a beautiful way. Dear Brian

This is the best illustration of BGP ORF that i have ever gone through,
many thanks for sharing your knowledge in such a
beautiful way.

]]> By: Yiu http://blog.internetworkexpert.com/2008/05/05/understanding-bgp-outbound-route-filtering-bgp-orf/#comment-1685 Yiu Thu, 08 May 2008 04:10:14 +0000 http://blog.internetworkexpert.com/2008/05/05/understanding-bgp-outbound-route-filtering-bgp-orf/#comment-1685 Thanks Brian taking the time to explain ORF, this is really helpful. Thanks Brian taking the time to explain ORF, this is really helpful.

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