Cisco Systems 78-11741-02 manual Ospf Point-to-Multipoint, Nonbroadcast Example, IPC-244

Configuring OSPF

OSPF Configuration Examples

U- per-user static route, o - ODR Gateway of last resort is not set

C 1.0.0.0/8 is directly connected, Loopback0 10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks

O 10.0.1.3/32 [110/100] via 10.0.1.3, 00:39:08, Serial0

C 10.0.1.0/24 is directly connected, Serial0

O 10.0.1.5/32 [110/5] via 10.0.1.5, 00:39:08, Serial0

O 10.0.1.4/32 [110/10] via 10.0.1.4, 00:39:08, Serial0

OSPF Point-to-Multipoint, Nonbroadcast Example

The following example illustrates a point-to-multipoint network with nonbroadcast:

interface Serial0

ip address 10.0.1.1 255.255.255.0

ip ospf network point-to-multipoint non-broadcast encapsulation frame-relay

no keepalive frame-relay local-dlci 200

frame-relay map ip 10.0.1.3 202 frame-relay map ip 10.0.1.4 203 frame-relay map ip 10.0.1.5 204 no shut

!

router ospf 1

network 10.0.1.0 0.0.0.255 area 0 neighbor 10.0.1.3 cost 5 neighbor 10.0.1.4 cost 10 neighbor 10.0.1.5 cost 15

The following example is the configuration for the router on the other side:

interface Serial9/2

ip address 10.0.1.3 255.255.255.0 encapsulation frame-relay

ip ospf network point-to-multipoint non-broadcast no ip mroute-cache

no keepalive no fair-queue

frame-relay local-dlci 301 frame-relay map ip 10.0.1.1 300 no shut

!

router ospf 1

network 10.0.1.0 0.0.0.255 area 0

The output shown for neighbors in the first configuration is as follows:

Router# show ip ospf neighbor

Neighbor ID	Pri	State		Dead Time	Address	Interface
4.1.1.1	1	FULL/	-	00:01:52	10.0.1.5	Serial0
3.1.1.1	1	FULL/	-	00:01:52	10.0.1.4	Serial0
2.1.1.1	1	FULL/	-	00:01:52	10.0.1.3	Serial0

Variable-Length Subnet Masks Example

OSPF, static routes, and IS-IS support variable-length subnet masks (VLSMs). With VLSMs, you can use different masks for the same network number on different interfaces, which allows you to conserve IP addresses and more efficiently use available address space.

Cisco IOS IP Configuration Guide

IPC-244