[nsp] using /31s

[Jeff]

> I'm missing a nugget of clue -
> 
> edge2(config)#interface Serial6/0/4:0
> edge2(config-if)#ip address 216.23.183.248 255.255.255.254
> Bad mask /31 for address 216.23.183.248
> edge2(config-if)#ip address 216.23.183.249 255.255.255.254
> Bad mask /31 for address 216.23.183.249
> edge2(config-if)#ip address 216.23.183.250 255.255.255.254
> Bad mask /31 for address 216.23.183.250
> edge2(config-if)#ip address 216.23.183.251 255.255.255.254
> Bad mask /31 for address 216.23.183.251
> 
> 216.23.183.0/24 is VSLM'd but has mostly /30s.  I have essentially two /30s
> left (216.23.183.248/30, 216.23.183.252/30) and figured I'd double that with
> /31s but I'm having issues with IOS accepting it.

I am not sure if you are being serious here, but a /31 is an invalid
netmask.

It will only give you the network and broadcast, no actually usable IP
Addresses.

Jeff.