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Wild Card Mask

Last Modified: 2017-11-16
In the topology above , I have EIGRP configured on both routers.
I have advertised all the networks to EIGRP

these are the interfaces in R2:
R2(config-router)# do show ip interface bri
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0      YES manual up                    up      
FastEthernet0/1            unassigned      YES unset  administratively down down    
FastEthernet1/0            unassigned      YES unset  administratively down down    
FastEthernet1/1            unassigned      YES unset  administratively down down    
Loopback0              YES manual up                    up      
Loopback1              YES manual up                    up      
Loopback2              YES manual up                    up      
Loopback3              YES manual up                    up      

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in R2 , when I advertise R2(config-router)#network
I do not get any error, and all 172.x.x.x networks will show up in R1 routing table:

R1#sh ip route  eigrp 

Gateway of last resort is not set is subnetted, 4 subnets
D [90/156160] via, 00:02:02, FastEthernet0/0
D [90/156160] via, 00:02:02, FastEthernet0/0
D [90/156160] via, 00:02:02, FastEthernet0/0
D [90/156160] via, 00:02:02, FastEthernet0/0

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but if I try different wild card mask I get error  :
%EIGRP: Invalid mask (discontiguous)

but if I try these wild card masks one a time after Negating one of them , it will work:

***So the ones that worked (one a time) are:

the : ,,

I get this error :%EIGRP: Invalid mask (discontiguous)

Any idea why  ?

Thank you
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