■
―ディスタンスベクター型ルーティングプロトコルにおけるスプリットホライズンの問題点の回避
夏なので雲が大きいです。
■FRSW
FRSW(config)#frame-relay switching
FRSW(config)#int s2/0
FRSW(config-if)#encapsulation frame-relay
FRSW(config-if)#frame-relay intf-type dce
FRSW(config-if)#frame-relay route 120 int s2/1 210
FRSW(config-if)#frame-relay route 130 int s2/2 310
FRSW(config-if)#frame-relay route 140 int s2/3 410
FRSW(config-if)#no shut
FRSW(config-if)#int s2/1
FRSW(config-if)#encapsulation frame-relay
FRSW(config-if)#frame-relay intf-type dce
FRSW(config-if)#frame-relay route 210 int s2/0 120
FRSW(config-if)#no shut
FRSW(config-if)#int s2/2
FRSW(config-if)#encapsulation frame-relay
FRSW(config-if)#frame-relay intf-type dce
FRSW(config-if)#frame-relay route 310 int s2/0 130
FRSW(config-if)#no shut
FRSW(config-if)#int s2/3
FRSW(config-if)#encapsulation frame-relay
FRSW(config-if)#frame-relay intf-type dce
FRSW(config-if)#frame-relay route 410 int s2/0 140
FRSW(config-if)#no shut
FRSW(config-if)#end
■R1
R1(config)#int s1/0
R1(config-if)#encapsulation frame-relay
R1(config-if)#no shut
R1(config-if)#int s1/0.1 multipoint
R1(config-subif)#ip address 192.168.1.1 255.255.255.0
R1(config-subif)#no ip split-horizon eigrp 100
R1(config-subif)#frame-relay map ip 192.168.1.2 120 broadcast
R1(config-subif)#frame-relay map ip 192.168.1.3 130 broadcast
R1(config)#int s1/0.2 point-to-point
R1(config-subif)#ip address 192.168.2.1 255.255.255.0
R1(config-subif)#frame-relay interface-dlci 140
R1(config-fr-dlci)#exit
R1(config-subif)#exit
R1(config-if)#exit
R1(config)#router eigrp 100
R1(config-router)#network 192.168.1.0
R1(config-router)#network 192.168.2.0
R1(config-router)#no auto-summary
■R2
R2(config)#int s1/0
R2(config-if)#encapsulation frame-relay
R2(config-if)#ip address 192.168.1.2 255.255.255.0
R2(config-if)#no shut
R2(config-if)#frame-relay map ip 192.168.1.1 210 broadcast
R2(config-if)#frame-relay map ip 192.168.1.3 210 broadcast
R2(config-if)#int loopback 0
R2(config-if)#ip address 2.2.2.2 255.255.255.0
R2(config-if)#no shut
R2(config-if)#end
R2#conf t
R2(config)#router eigrp 100
R2(config-router)#network 192.168.1.0
R2(config-router)#network 2.0.0.0
R2(config-router)#no auto-summary
R2(config-router)#end
■R3
R3(config)#int s2/0
R3(config-if)#encapsulation frame-relay
R3(config-if)#ip address 192.168.1.3 255.255.255.0
R3(config-if)#no shut
R3(config-if)#frame-relay map ip 192.168.1.1 310 broadcast
R3(config-if)#frame-relay map ip 192.168.1.2 310 broadcast
R3(config-if)#int loopback 0
R3(config-if)#ip address 3.3.3.3 255.255.255.0
R3(config-if)#no shut
R3(config-if)#end
R3#conf t
R3(config)#router eigrp 100
R3(config-router)#network 192.168.1.0
R3(config-router)#network 3.0.0.0
R3(config-router)#no auto-summary
R3(config-router)#end
■R4
R4(config)#int s2/0
R4(config-if)#encapsulation frame-relay
R4(config-if)#ip address 192.168.2.2 255.255.255.0
R4(config-if)#no shut
R4(config-if)#frame-relay interface-dlci 410
R4(config-if)#int loopback 0
R4(config-if)#ip address
R4(config-if)#ip address 4.4.4.4 255.255.255.0
R4(config-if)#no shut
R4(config-if)#ex
R4(config)#router eigrp 100
R4(config-router)#network 192.168.2.0
R4(config-router)#network 4.0.0.0
R4(config-router)#no auto-summary
■R2から4.4.4.4へpingする
R2#ping 4.4.4.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 4.4.4.4, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/8/12 ms
■R2のルーティングテーブルを確認する
R2#sh ip route
Codes: C - connected, S - static, 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
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
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Loopback0
3.0.0.0/24 is subnetted, 1 subnets
D 3.3.3.0 [90/2809856] via 192.168.1.1, 00:00:36, Serial1/0
4.0.0.0/24 is subnetted, 1 subnets
D 4.4.4.0 [90/2809856] via 192.168.1.1, 00:02:34, Serial1/0←R4の先のルート情報をR1経由で受け取っています。
C 192.168.1.0/24 is directly connected, Serial1/0
D 192.168.2.0/24 [90/2681856] via 192.168.1.1, 00:02:34, Serial1/0
