Cisco Loopback Address Question

Hello Experts,

I'm getting 'bad mask' when I enter the following ip address:

ip address 10.1.243.110 255.255.255.255
Bad mask /32 for address 10.1.243.110

I thought you could add /32 for any address?

Regards

cpatte7372
cpatte7372Asked:
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Kash2nd Line EngineerCommented:
Your IP address needs to be 10.1.243.111 which is the only useable address you have.

IP: 10.1.243.111
Broadcast Address: 10.1.243.110
Mast: 255.255.255.255
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cpatte7372Author Commented:
Experts

I'm assigning the ip address to inteface FastEthernet0/0

Cheers
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Faruk Onder YerliOwnerCommented:
Dear cpaette;

practically you should assign /32 IP address just in loopback interface. Fast or Giga interfaces needs to use min /30 range. IT is meaningless to  use /32 on physical interface.

If you already assign ip address like 10.1.243.0/24 in physical interface, loopback has to be out of physical range scope. If you are not using vrf function on router, each interface network has to be different eachother.

Good days ..
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Don JohnstonInstructorCommented:
I'm pretty sure that the longest mask you can have on a physical interface is a /31.  I don't remember which IOS version began supporting the /31.  A late 12 or early 15, IIRC.

But no /32's.
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cpatte7372Author Commented:
cheers
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