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configuring statip IP routing table using loopbak address

I'm preparing for CCNA certification and I just began playing around with routers in GNS3 simulator.  I'm creating a simple network using 2 routers connected by GigaEthernet cable.  I've configured each routers to have an IP address and a loopback address.  I'm tring to create a static IP routing table.  Following is the commands that I have used to configure the router(R1):

hostname R1
interface g1/0
ip address 192.168.1.1 255.255.255.0
no shutdown
interface loopback0
ip address 10.10.10.1 255.255.255.0
no shutdown

I configure router (R2) in the same way using loopback - 172.20.100.1 and IP - 192.168.1.2
I do the show command and everything is in place and I do the same for router R2.
The following is the command that I'm entering to create the static routing table for R1:
ip route 172.20.100.1 255.255.255.0 192.168.1.2

When I enter, I get an error "Inconsistent address and mask".  I tried reversing the loopback address and the IP address and I get the same error.  What am I missin?
Thank you in advance.

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elly960
Asked:
elly960
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1 Solution
 
JFrederick29Commented:
Either enter this:

ip route 172.20.100.1 255.255.255.255 192.168.1.2

Or this:

ip route 172.20.100.0 255.255.255.0 192.168.1.2
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elly960Author Commented:
it worked.  Thank you.  But I wish I understood why I have to configure it like that.  
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elly960Author Commented:
JFrederick,
Can you please take a look at my other question "Configuring three routers with loopback address"?
Thank you so much for your help.

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