Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manuel d'utilisateur télécharger pdf (Page 151)

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7-1

Chapter 7

Configuring Route and Traffic Balancing

BGP route balancing and traffic balancing are two techniques that allow a BGP

speaker to distribute routes to the same destination among multiple equal-cost

paths. This chapter describes how to configure route and traffic balancing for

IBGP and EBGP.

In both techniques, BGP uses equal-cost multipath (ECMP) routes submitted to

the IP routing table by the IGP (OSPF or RIP) in the AS. The ECMP routes could

also be static routes. For information about configuring ECMP for OSPF and RIP,

see Configuring IP, ARP, RARP, RIP, and OSPF Services.

Configuring IBGP for Route and Traffic Balancing

To configure an IBGP speaker for route balancing and traffic balancing, the IGP

used in the AS (OSPF, for example) should be configured for ECMP on all

routers. An IBGP speaker must be configured for ECMP on OSPF/BGP routers.

For instructions on configuring ECMP, see Configuring IP, ARP, RARP, RIP, and

OSPF Services.

Figure 7-1

shows an AS containing six IP routers. The routers with interfaces to

internal links only are running OSPF. The routers with interfaces to both internal

and external links are running OSPF and BGP.

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Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manuel d'utilisateur Page 151