Practical BGP by Russ White

By Russ White

Now there is a useful advisor to deploying and coping with BGPv4 in any setting - from small organisations to the most important Tier 2 and Tier three provider prone. A workforce of the world's top BGP specialists brings jointly strong insights into community layout, configuration, and deployment with the most recent model of BGP - together with hands-on advice for leveraging its key improvements.

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BGP extended communities are described in the Internet Draft document, draft-ietf-idr-bgp-ext-communities, BGP Extended Communities Attribute, which should be progressed to RFC status sometime in the near future. 38 39 Multiprotocol Addresses The original BGP packet format was formatted around IPv4 addresses, which are 4 octets in length. In order to carry new types of addresses, such as IPv6, MPLS Labels, VPN information, CLNS addresses, and others, special address family attributes were created to carry these address types.

Conditional advertisement. The configurations for the routers and the output of show ip bgp on corpedge-b and provedge-b follow. corpedge-b ! 00 ! 0 neighbor corpedge-a remote-as 65240 neighbor provedge-b remote-as 65242 neighbor provedge-b advertise-map advertmap non-exist-map nonexistmap no auto-summary ! 255 ! route-map advertmap permit 10 match ip address 10 ! 1 Status codes: s suppressed, d damped, h history, * valid, > best Origin codes: i - IGP, e - EGP, ? 2 Status codes: s suppressed, d damped, h history, * valid, > best Origin codes: i - IGP, e - EGP, ?

There is one other more complicated method that can be used, which revolves around forcing all the communications between your network and the rest of the hosts on the Internet to travel along symmetric paths at least as far as the exit and entry points into your network are concerned. This is discussed in the Forcing Symmetric Routing section later in this chapter. Using Only One Link at A Time Rather than attempting to load balance inbound between the two service provider connections, you can also configure one link to be used only when the primary link fails.

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