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Supernet address on an interface

Is it possible to apply a supernet mask to a router interface?

Currently i have 2 subnets 192.168.30.0/24 & 192.168.31.0/24 and i want to club them to one subnet. i.e 192.168.30.0/23

Is this practice feasible as i cannot do a readressing

thanks in advance

2 REPLIES
Silver

Re: Supernet address on an interface

I prefer to use secondary IP address under the interface:

interface fastethernet 0/1

ip address 192.168.30.1 255.255.255.0

ip address 192.168.31.1 255.255.255.0 secondary

and this version works.

If you need more secondary address you can assign more to one interface (but not the bestto use eg: 5 secondary address)

bye

FCS

Please rate me if I helped.

Hall of Fame Super Silver

Re: Supernet address on an interface

I believe that you can configure the 192.168.30.0/23 on the router interface and that the router will accept it. If you do this I believe that the router will ARP for any address in that address space and will forward traffic to any of those addresses.

But the suggestion that FCS makes about keeping /24 and using secondary addressing may have some advantages. You may need to consider whether you will run a dynamic routing protocol and what the protocol would do with the /23. You also might want to consider whether the end stations that will be connected can support the supernet addressing.

HTH

Rick

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