
Configuring IP Services
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BGP Implementation Notes
This section provides you with some guidelines that you should follow when you
configure BGP. If you do not follow these guidelines, BGP will either not work
efficiently or will become disabled on the interfaces involved.
• BGP will not operate with an IP router in nonforwarding (host-only) mode.
Make sure that the routers you want BGP to operate with are in forwarding
mode.
• If you are using BGP for a multihomed AS (one that contains more than one
exit point), we strongly encourage you to use OSPF for your IGP and BGP for
your sole exterior gateway protocol, or use intra-AS IBGP routing.
If OSPF is the IGP, you should also use the default OSPF tag construction.
Using EGP or modifying the OSPF tags makes network administration and
proper construction of BGP path attributes more difficult.
• For any router supporting both BGP and OSPF, the OSPF router ID and the
BGP identifier must be the same.
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