Configuration d`une interface lo10 et annonce en tant que « default network » :
BB3(config)#int lo10
BB3(config-if)#ip address 33.33.33.33 255.0.0.0
BB3(config)#ip default-network 33.0.0.0
Vérifications:
BB3#show ip route 33.33.33.0 Routing entry for 33.0.0.0/8 Known via "connected", distance 0, metric 0 (connected, via interface), candidate def ault path Redistributing via eigrp 300 Routing Descriptor Blocks: * directly connected, via Loopback10 Route metric is 0, traffic share count is 1
BB3#show 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, 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 1.0.0.0/24 is subnetted, 1 subnets D EX 1.1.1.0 [175/20665600] via 10.1.113.3, 00:08:53, Ethernet0 2.0.0.0/24 is subnetted, 1 subnets D EX 2.2.2.0 [175/2561049856] via 10.1.113.3, 00:08:53, Ethernet0 C* 33.0.0.0/8 is directly connected, Loopback10 3.0.0.0/24 is subnetted, 1 subnets D 3.3.3.0 [95/409600] via 10.1.113.3, 00:08:57, Ethernet0 4.0.0.0/24 is subnetted, 1 subnets D 4.4.4.0 [95/21177600] via 10.1.113.3, 00:08:53, Ethernet0 113.0.0.0/24 is subnetted, 3 subnets C 113.2.2.0 is directly connected, Loopback2 C 113.1.1.0 is directly connected, Loopback1 C 113.0.0.0 is directly connected, Loopback0 112.0.0.0/32 is subnetted, 3 subnets D EX 112.2.2.112 [175/2561049856] via 10.1.113.3, 00:08:55, Ethernet0 D EX 112.1.1.112 [175/2561049856] via 10.1.113.3, 00:08:55, Ethernet0 D EX 112.0.0.112 [175/2561049856] via 10.1.113.3, 00:08:55, Ethernet0 111.0.0.0/24 is subnetted, 3 subnets D EX 111.2.2.0 [175/20668160] via 10.1.113.3, 00:08:55, Ethernet0 D EX 111.1.1.0 [175/20668160] via 10.1.113.3, 00:08:55, Ethernet0 D EX 111.0.0.0 [175/20668160] via 10.1.113.3, 00:08:55, Ethernet0 10.0.0.0/24 is subnetted, 7 subnets D 10.1.14.0 [95/21049600] via 10.1.113.3, 00:08:55, Ethernet0 D 10.1.13.0 [95/20537600] via 10.1.113.3, 00:08:59, Ethernet0 D 10.1.12.0 [95/21049600] via 10.1.113.3, 00:08:55, Ethernet0 D EX 10.1.111.0 [175/20540160] via 10.1.113.3, 00:08:55, Ethernet0 D 10.1.100.0 [95/20537600] via 10.1.113.3, 00:08:59, Ethernet0 C 10.1.113.0 is directly connected, Ethernet0 D EX 10.1.112.0 [175/2561049856] via 10.1.113.3, 00:08:56, Ethernet0
Par défaut, l`information de route par défaut est propagée :
BB1#show ip route eigrp | inc 33. D*EX 33.0.0.0 [170/2326016] via 10.1.111.1, 00:05:25, Ethernet0
Configuration de R1 afin de ne pas propager l`information ‘default’ :
R3(config)#router eigrp 300
R3(config-router)#no default-information allowed out
R3#clear ip eigrp neighbors
Vérification :
BB1#show ip route eigrp | inc 33. D EX 33.0.0.0/8 [170/2326016] via 10.1.111.1, 00:01:52, Ethernet0
Acces-list
Mise en place d`une access-list pour n`autoriser que les sous réseau légitime
R3(config)#access-list 3 permit 33.0.0.0 R3(config)#router eigrp 300 R3(config-router)#default-information allowed in 3
vérifications :
R3#show ip route eigrp | inc 33
D* 33.0.0.0/8 [90/156160] via 10.1.113.113, 00:00:01, FastEthernet0/0
R3(config)#no access-list 3
R3(config)#access-list 3 permit 44.0.0.0
R3#clear ip eigrp neighbors
R3#show ip route eigrp | inc 33
D 33.0.0.0/8 [90/156160] via 10.1.113.113, 00:00:39, FastEthernet0/0