
Configuring and Customizing BGP
303528-A Rev 00
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BGP Implementation Notes
This section provides guidelines that you should follow when you configure BGP.
If you do not follow these guidelines, BGP either will not work efficiently or will
become disabled on the interfaces involved. The guidelines are as follows:
• 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), Bay Networks strongly encourages 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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