Tech Note about default-network

From: gladston@br.ibm.com
Date: Fri Jun 17 2005 - 11:44:28 GMT-3

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Hi,

Every time I read this doc from Cisco I though the word 'again' was because the first command would not work (first command is ip route 171.70.24.0 255.255.255.0 131.108.99.2).
 
" The ip default-network command must be issued again, using the major net, in order to flag the candidate default route."

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094374.shtml

Now, after testing and looking Groupstudy archive it seems 'again' means that it is necessary both commands:

ip route 171.70.24.0 255.255.255.0 131.108.99.2
ip route 171.70.24.0 255.255.255.0 131.108.0.0

Is that right?

I am still finding some inconsistencies.
For example, this works:

ip default-network 171.68.20.1
ip default-network 171.68.0.0

Rack2R6#sir
Gateway of last resort is 171.68.20.1 to network 171.68.0.0

 * 171.68.0.0/16 is variably subnetted, 3 subnets, 2 masks
S* 171.68.0.0/16 [1/0] via 171.68.20.1
D EX 171.68.1.1/32 [170/514560] via 142.20.65.5, 01:53:50, FastEthernet4/1
                      [170/514560] via 142.20.56.5, 01:53:50, FastEthernet4/0
D EX 171.68.20.1/32 [170/514560] via 142.20.65.5, 01:53:50, FastEthernet4/1

But this do not work: (there is a route to net 142.200.0.0)

 ip default-network 142.200.0.0

Rack2R6#sir

Gateway of last resort is not set

     171.68.0.0/32 is subnetted, 2 subnets
D EX 171.68.1.1 [170/514560] via 142.20.65.5, 01:55:35, FastEthernet4/1
                   [170/514560] via 142.20.56.5, 01:55:35, FastEthernet4/0
D EX 171.68.20.1 [170/514560] via 142.20.65.5, 01:55:35, FastEthernet4/1
                    [170/514560] via 142.20.56.5, 01:55:35, FastEthernet4/0
 * 142.200.0.0/16 is subnetted, 1 subnets
D*EX 142.200.0.0 [170/514560] via 142.20.65.5, 01:55:37, FastEthernet4/1
                    [170/514560] via 142.20.56.5, 01:55:37, FastEthernet4/0
 * 142.20.0.0/16 is variably subnetted, 22 subnets, 4 masks

Rack2R6#sir 142.200.0.0
Routing entry for 142.200.0.0/16, 1 known subnets
  Redistributing via eigrp 10

D*EX 142.200.0.0 [170/514560] via 142.20.65.5, 01:55:00, FastEthernet4/1
                    [170/514560] via 142.20.56.5, 01:55:00, FastEthernet4/0

Any feedback appreciated.

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