Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manual de usuario descargar pdf (Pagina 30)

Configuring IP Exterior Gateway Protocols (BGP and EGP)

1-8

308628-15.0 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 6, “Configuring a

Route Reflector.”

Equal-Cost Multipath

Equal-cost multipath (ECMP) support allows a BGP speaker to perform route or

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

the routing table by OSPF, RIP, or static routes. For instructions on configuring

route and traffic balancing, see Chapter 7, “

Configuring Route and Traffic

Balancing.” For more information about equal-cost multipath, see Configuring IP,

ARP, RARP, RIP, and OSPF 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) as well as a list of unreachable networks. In addition, an

update includes the following:

• List of path attributes

• Local preference value—BGP-4 only. (See “

Disabling BayRS Local

Preference Calculation and Route Selection” on page 3-25.)

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 275 276

Sin comentarios

Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manual de usuario Pagina 30