[nsp] using /31s

[Shankar Vemulapalli]

Hi Jeff -

Check RFC3021 for more information.
http://www.ietf.org/rfc/rfc3021.txt?number=3031


/Shankar

At 2:30pm 02/09/04 -0500, Jeff wrote:
> > 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.
>
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