HP 7102dl - ProCurve Secure Router Configuration Manual page 766

Procurve secure router 7000dl series - advanced management and configuration guide

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IP Routing—Configuring RIP, OSPF, BGP, and PBR

Configuring OSPF

One common topology for a WAN is a headquarters, defined as area 0, that

connects to stub areas at one or more remote sites. In this topology, the

headquarters' routers that connect to the remote sites are ABRs. The routers

at the remote sites are internal routers. If a router connects to a public or other

external network, such as an ISP, it is an ASBR. (See Figure 15-6.)

Figure 15-6. OSPF Network with Headquarters (HQ) as Area 0

Another topology for an OSPF WAN is a network backbone, consisting of the

network on which each router's WAN interface resides, and a series of areas,

consisting of the LAN or LANs at each site. In other words, routers or routing

switches in each LAN would be the internal routers for that stub area. The

ProCurve Secure Routers that provide WAN connections to the remote sites

would be ABRs. These routers would have one or more interfaces in area 0

and one or more interfaces in the local stub area. They would thus string stub

areas together. Such a topology is best suited for two or more remote sites of

roughly equal complexity. (See Figure 15-7. Note that this figure simplifies the

topology. In reality, each stub area would have many more routers or routing

switches than the ones shown in the figure.)

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