Ok, try this
Ip- classless: allows a router to look for routes classlessly
(understands subnets) meaning it will do a longest bit match with routes
in your routing table but if after checking for subnets it doesn't find
one locally then it follows the default route.
With out this command the router would still do a longest bit
match but doesn't understand subnets, and would check for a subnet if it
is not local to your router it would be dropped.
Ip subnet-zero- This allows the use of the zero subnet and the ip
addresses in that range. take for instance you have a 10.1.1.0/24 and
you decided to break that up into 2 networks. the network would be
10.1.1.64/26 and 10.1.1.128/26 you have lost two networks network
10.1.1.0/26 (.1-.62, 63 is broadcast) and its ip addresses and
10.1.1.192/26 (.193-254, 255 is broadcast) and its ip addresses.
PING wrote:
>ip classless is used to tell the routing protocols which supports VLSM that
>subnet should be sdvertised as part of the route. ip classfull on the other
>hand
>is used to restrict to use major class subnet mask.
>
>Nadeem
>======
>
>Arnaldo Gomez wrote:
>
>>Can someone give a gerneral explanation on these two commands?
>>
>>ip subnet-zero
>>ip-classless
>>
>>What do they do and why would you use them?
>>
>>Thanks.
>>
>>Arnaldo
>>
>--
>====================
>Ishrat Nadeem Zahid
>CCNP
>Cisco Systems,Inc.
>Chelmsford, MA 01824
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http://www.groupstudy.com/form/read.php?f=7&i=35370&t=35340
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