
308628-14.00 Rev 00
9-1
Chapter 9
Configuring Route and Traffic-Load Balancing
IBGP route balancing and traffic-load balancing are two techniques that allow an
IBGP speaker to distribute routes to the same destination among multiple
equal-cost paths. This chapter describes how to configure route and traffic-load
balancing.
In both techniques, IBGP 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 ECMP routing, see Chapter 4,
“Configuring and Customizing IP for BGP.”
Configuring IBGP for Route and Traffic-Load Balancing
To configure an IBGP speaker for route balancing and traffic-load balancing, the
IGP used in the AS (OSPF, for example) must be configured for ECMP on all
routers.
Figure 9-1
, for example, shows an AS containing six IP routers. The routers with
interfaces to internal links are running OSPF. The routers with interfaces to both
internal and external links are running OSPF and BGP.
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