Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Uživatelský manuál stáhnout pdf (Strana 34)

Configuring IP Exterior Gateway Protocols (BGP and EGP)

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308628-15.0 Rev 00

BGP Implementation Notes

The following guidelines are crucial to successful BGP configuration.

• 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. For instructions on setting the forwarding mode, see Configuring IP,

ARP, RARP, RIP, and OSPF Services.

• If you are using BGP for a multihomed AS (one that contains more than one

exit point), Nortel Networks strongly encourages you to use OSPF for your

IGP and BGP for your sole exterior gateway protocol, or use intra-AS IBGP

routing. For information about configuring OSPF, see Configuring IP, ARP,

RARP, RIP, and OSPF Services.

• If OSPF is the IGP, you should 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 set to the same IP address.

• For BGP to run as a soloist, Internet service provider (ISP) mode must be

enabled. For instructions on enabling ISP mode, see Configuring IP, ARP,

RARP, RIP, and OSPF Services.

• In configurations where BGP speakers reside on routers that have multiple

network connections over multiple IP interfaces (the typical case for IBGP

speakers), consider using the address of the router’s circuitless (virtual) IP

interface as the local peer address. In this way, you ensure that BGP is

reachable as long as there is an active circuit on the router. For instructions on

configuring the circuitless (or virtual) IP interface, see Configuring IP, ARP,

RARP, RIP, and OSPF Services.

• By default, an external BGP speaker will neither advertise any routes to a

peer, nor inject any routes into its IGP. Configure route policies to enable any

route advertisement. For instructions on configuring policies, see Chapter 5,

“Configuring BGP Accept and Announce Policies.”

Caution:

If you do not follow these guidelines, BGP either will not work

efficiently or will become disabled on the interfaces involved.

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Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Uživatelský manuál Strana 34