Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Uživatelský manuál stáhnout pdf (Strana 28)

Configuring IP Exterior Gateway Protocols (BGP and EGP)

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308628-14.00 Rev 00

To avoid the high costs of a full-mesh topology to support IBGP speakers within a

large AS, you can configure a router to function as an IBGP route reflector (RR).

An IBGP speaker that needs to communicate with other BGP speakers in the AS

establishes a single peer-to-peer RR client session with the IBGP route reflector.

For information about the IBGP route reflector, see Chapter 8, “Configuring a

Route Reflector.”

Equal-Cost Multipath

BGP equal-cost multipath (ECMP) support allows a BGP speaker to perform

route balancing within an AS by using multiple equal-cost routes submitted to the

routing table by OSPF or RIP. For more information about BGP equal-cost

multipath, see Configuring IP Multicasting and Multimedia Services.

BGP Updates

BGP-3 and BGP-4 speakers exchange routing updates that include a network

number and a list of autonomous systems that the routing information has passed

through (the AS path).

In addition, an update includes the following:

• List of path attributes

• Local preference value -- BGP-4 only (described in Chapter 5, “Configuring

and Customizing BGP”)

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Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Uživatelský manuál Strana 28