帧中继承载OSPF –点对点( Point-to-Point)
目标：
在R1和R2之间的帧中继网络中配置OSPF，网络类型为point-to-point，实现VLAN A和VLAN B的互通。
配置指南：
? 在R1上配置接口Ethernet0/0地址为1.0.0.1/8
? 在R2上配置接口Ethernet0/0地址为 2.0.0.2/8
? 在R1上配置接口Seria0/0地址为10.0.0.1/8
? 在R2上配置接口Seria0/0地址为10.0.0.2/8
? 使用静态三层和二层解析来配置R1和R2之间帧中继链路
? 确保链路支持广播和多播数据包传递
? 在R1和R2的Serial接口上配置OSPF网络类型为point-to-point
? 配置R1和R2中所有接口加入area 0
自我提问：
? 在多点的帧中继接口上缺省的OSPF网络类型是什么?
? point-to-point网络类型和其他网络类型有什么不同?
? hello包是单播还是组播发送?
? 支持DR/BDR 选举吗?为什么?
最终配置和验证：
R1:
interface Ethernet0/0
ip address 1.0.0.1 255.0.0.0
!
interface Serial0/0
ip address 10.0.0.1 255.0.0.0
encapsulation frame-relay
ip ospf network point-to-point
frame-relay map ip 10.0.0.2 102 broadcast
!
router ospf 1
network 0.0.0.0 255.255.255.255 area 0
R2:
interface Ethernet0/0
ip address 2.0.0.2 255.0.0.0
!
interface Serial0/0
ip address 10.0.0.2 255.0.0.0
encapsulation frame-relay
ip ospf network point-to-point
frame-relay map ip 10.0.0.1 201 broadcast
!
router ospf 1
network 0.0.0.0 255.255.255.255 area 0
R1#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
10.0.0.2 1 FULL/ - 00:00:33 10.0.0.2 Serial0/0
R2#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
10.0.0.1 1 FULL/ - 00:00:29 10.0.0.1 Serial0/0
R2#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
O 1.0.0.0/8 [110/74] via 10.0.0.1, 00:01:08, Serial0
C 2.0.0.0/8 is directly connected, Ethernet0
C 10.0.0.0/8 is directly connected, Serial0
R1#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
C 1.0.0.0/8 is directly connected, Ethernet0
O 2.0.0.0/8 [110/74] via 10.0.0.2, 00:00:10, Serial0
C 10.0.0.0/8 is directly connected, Serial0
R1#
注解：
point-to-point 使用组播传送，不支持DR/BDR 选举，是点到点NBMA媒介类似ISDN和点到点子接口等的缺省网络类型。由于使用组播传递，所以在frame-relay map命令中要加上broadcast选项。