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100

101

Configuring IP Services

4-4

Figure 4-1, for example, shows a point-to-multipoint topology in which four AN

routers are connected by Frame Relay links to a BCN router. The AN routers are

the spokes of the topology, and the BCN router is the hub. All of the routers are

running OSPF. The BCN router is connected to the Frame Relay network over a

permanent virtual circuit (PVC) in group mode. The AN routers are connected

over PVCs in direct or group mode. For details on Frame Relay, see

Conﬁguring

Frame Relay Services.

Figure 4-1. Point-to-Multipoint Topology

OSPF point-to-multipoint interfaces provide an efﬁcient means to connect routers

in a star topology. The routers are conﬁgured as follows:

• The hub of the star topology — the BCN router in Figure 4-1 — is conﬁgured

with a point-to-multipoint interface to the PVC and is set to be the OSPF

designated router in the network. The Router Priority parameter is set to a

value greater than 0.

• Each spoke of the star — the AN routers in Figure 4-1 — is conﬁgured with a

point-to-multipoint interface to the PVC and is made ineligible to become the

designated router. The Router Priority parameter on each AN is set to 0.

When the spokes of the topology (the AN routers) are computing routes through

the other spokes, the next hop is forced to be the hub (the BCN router). The hub

can then forward the packet to the correct spoke.

BCN

AN1

Group Mode PVC

Group Mode or

Direct Mode PVC

AN2 AN3

AN4

Frame Relay

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