RE: Blocked Class A address

Hi Sameer,

In a prefix list?

ip prefix-list class-a-space permit 0.0.0.0/1 le 32

in an access-list?

ip access-list extended 101
permit 0.0.0.0 127.255.255.255 0.0.0.0 255.255.255.255

then you probably want to match the former in a route-map

route-map block-class-a deny 5
match ip address prefix-list class-a-space

or the latter in a distribution list (or similar)

distribute-list 101 in interface serial0/0

(of course, you can often use either prefix-lists or acl's with either route-map's or distribution-lists)

Another slick way to do the blocking;

Match the lists with a distance 255 command under "router <protocol>" :)

-Joe

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Experts ,
Any one advice about , how do I block class A addresses ?
Kind regards,

Sameer

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Received on Mon Dec 20 2010 - 07:48:38 ART