Adventures in IP Default-network

Rack1R6(config)#do sh run | i ip route

ip route 54.0.0.0 255.0.0.0 54.1.1.0

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*****at this point the summary should be in the routing table and gateway of last resort is not set as there is no candidate default(since we dont see a * next to the static******

Rack1R6#show ip route | i S

S       54.0.0.0/8 [1/0] via 54.1.1.0

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*****now i add the classful entry of the ip default network since the other cmd ws just for creating the static*****

Rack1R6(config)#ip default-network 54.0.0.0

AAAAND VOILA

Rack1R6(config)#do 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, 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 54.1.1.0 to network 54.0.0.0

     155.1.0.0/16 is variably subnetted, 8 subnets, 2 masks

C       155.1.146.0/24 is directly connected, FastEthernet0/0.146

R       155.1.9.0/24 [120/2] via 155.1.67.7, 00:00:08, FastEthernet0/0.67

R       155.1.13.1/32 [120/2] via 155.1.67.7, 00:00:08, FastEthernet0/0.67

R       155.1.13.0/24 [120/2] via 155.1.67.7, 00:00:08, FastEthernet0/0.67

R       155.1.7.0/24 [120/1] via 155.1.67.7, 00:00:08, FastEthernet0/0.67

R       155.1.37.0/24 [120/1] via 155.1.67.7, 00:00:08, FastEthernet0/0.67

R       155.1.79.0/24 [120/1] via 155.1.67.7, 00:00:08, FastEthernet0/0.67

C       155.1.67.0/24 is directly connected, FastEthernet0/0.67

     54.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C       54.1.1.0/24 is directly connected, Serial0/0/0

S*      54.0.0.0/8 [1/0] via 54.1.1.0

     150.1.0.0/24 is subnetted, 4 subnets

 --More--

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THE QUESTION>> WHY dont i see a 0.0.0.0 route in RIP on the other routers ie RIP is not picking it up????