目標：
在R1和R2之間的幀中繼網絡中配置OSPF，網絡類型爲point-to-point，實現VLAN A和VLAN B的互通。
配置指南：
• 在R1上配置接口Ethernet0/0地址爲1.0.0.1/8
• 在R2上配置接口Ethernet0/0地址爲 2.0.0.2/8
• 在R1上配置接口Seria0/0地址爲10.0.0.1/8
• 在R2上配置接口Seria0/0地址爲10.0.0.2/8
• 使用靜態三層和二層解析來配置R1和R2之間幀中繼鏈路
• 確保鏈路支持廣播和多播數據包傳遞
• 在R1和R2的Serial接口上配置OSPF網絡類型爲point-to-point
• 配置R1和R2中所有接口加入area 0
自我提問：
• 在多點的幀中繼接口上缺省的OSPF網絡類型是什麼?
• point-to-point網絡類型和其他網絡類型有什麼不同?
• hello包是單播還是組播發送?
• 支持DR/BDR 選舉嗎?爲什麼?
最終配置和驗證：
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#
註解：
point-to-point 使用組播傳送，不支持DR/BDR 選舉，是點到點NBMA媒介類似ISDN和點到點子接口等的缺省網絡類型。由於使用組播傳遞，所以在frame-relay map命令中要加上broadcast選項。