From: John Mistichelli (jmistichelli@xxxxxxxxx)
Date: Sun May 12 2002 - 07:41:20 GMT-3
Hi David,
I think you may be expecting IGRP to do something it doesn't do. When you use t
he 'ip default-network x.x.x.x' command it will mark network x.x.x.x as a defau
lt (marked with a *) in the routing table but will not insert a route to 0.0.0.
0.
For example:
200.200.200.0 (default) - RouterA -- 10.0.0.0 -- RouterB
ip default-network 200.200.200.0 on RouterA:
RouterA#sho ip ro
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, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default
U - per-user static route, o - ODR
Gateway of last resort is not set
* 200.200.200.0/30 is subnetted, 1 subnets
C* 200.200.200.0 is directly connected, Loopback0
C 10.0.0.0/8 is directly connected, Ethernet0
NOTE: Notice the * in front of the default network.
RouterB:
Bart#sho ip ro
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, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default
U - per-user static route, o - ODR
Gateway of last resort is 10.0.0.1 to network 200.200.200.0
I* 200.200.200.0/24 [100/1600] via 10.0.0.1, 00:00:34, Ethernet0
C 10.0.0.0/8 is directly connected, Ethernet0
NOTE: The "Gateway of last resort" was set to 10.0.0.1 which is RouterA's addre
ss. You may consider adding "ip classless" in your configurations as well.
Hope that helps.
John
7536
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