Found it (watch the wrap):
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_c
/ipcprt1/1cdipadr.htm#xtocid105604
"You can use the all zeros and all ones subnet (131.108.255.0), even though
it is discouraged. Configuring interfaces for the all ones subnet is
*explicitly allowed*. However, if you need the entire subnet space for your
IP address, use the following command in global configuration mode to enable
subnet zero: ip subnet-zero" [emphasis added]
---JRE---
""Brian Lodwick"" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Group,
> In determining valid subnetworks it used to be true all were valid
accept
> the all 1's subnet and the all 0's subnet. In an environment where all
> devices are compatible, I understand, that by using the configuration
> command "ip subnet-zero" it enables the use of the all 0's subnet. The
> question I ask then, wouldn't that leave the all 1's subnet still an
invalid
> subnet even when using the previous mentioned command? or is there
something
> else that allows the all 1's subnetwork? I have been asked this question,
> and I don't feel I am correct. The new formula noted in the CCNA book
notes
> the new equation for determining the amount of valid subnetworks is 2^# of
> subnet bits, and I figured it would be 2^#of subnet bits - 1 (for the all
> 1's subnet). I don't pose this question without first a bit of research
and
> everything I have read indicates the "ip subnet-zero" command only enables
> the use of the all 0's subnetwork. I however cannot find anything
indicating
> the use of the all 1's subnet is permitted. Any help is appreciated.
>
> >>>Brian
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