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Configuring IP Services
7-32
303528-A Rev 00
Using Point-to-Multipoint Interfaces in a Star 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 7-4 -- 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 7-4 -- 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.
Running OSPF with point-to-multipoint network interfaces addresses two
problems: how to minimize the number of subnets and the number of interfaces
required to support communications within the star topology. With
point-to-multipoint interfaces, each star topology requires only one subnet, rather
than one subnet for each PVC. Also, the hub needs to support only one interface
for each star rather than one interface for each PVC, reducing the demand for
resources on the router.
The Bay Networks proprietary point-to-multipoint solution is intended for routers
running OSPF in star frame relay topologies. Figure 7-4
, 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 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.
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