HP 7102dl - ProCurve Secure Router Configuration Manual page 805

Routers prefer routes discovered through eBGP over those discovered by an
internal routing protocol. For example, the organization in Figure 15-17 mul-
tihomes using Router A and Router B. Router A receives external routes from
the ISP; it receives the same external routes from Router B. Because the first
were discovered through eBGP, Router A uses these routes. It routes traffic it
receives from Networks 1 and 2 directly to the ISP. Router B does the same
for Networks 3 and 4.
Customer
Network 1
Network 3
Figure 15-17. Balancing Loads between a Connection to Two Neighbors
You can also attempt to manually balance outbound traffic by having the
router accept certain routes from one neighbor and the remaining routes from
another. (See "Load Balancing Outgoing Traffic by Preventing an Interface
from Learning Specific Routes" on page 15-86.)
Balancing Inbound Traffic. Similarly, you can attempt to manually balance
inbound traffic by having the router advertise certain networks to one neigh-
bor and other networks to the other neighbor.
IP Routing—Configuring RIP, OSPF, BGP, and PBR
Router A
Network 2
Router B
Network 4
Configuring BGP
ISP
ISP
ISP
15-79