One reason to add that null 0 hold down route is so you always have it in your route table. For instance if you are running BGP and anouncing a /20 to a provider and you have instability in your IGP you may lose the route in your table and not anounce that to your provider. If your provider sees the route flapping it can dampen your /20. With the hold down route you can always anounce the /20 cause it will be in your route table.
Mike F. ""Michael L. Williams"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > Also, to supplement (or create) summary routes....... > > Mike W. > > "Ladrach, Daniel E." wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > The Null interface is typically used for preventing routing loops. > > > > Daniel Ladrach > > CCNA, CCNP > > WorldCom > > > > > > > -----Original Message----- > > > From: Stanfast Preye [mailto:[EMAIL PROTECTED]] > > > Sent: Wednesday, May 01, 2002 2:34 PM > > > To: [EMAIL PROTECTED] > > > Subject: ip route statement [7:43001] > > > > > > > > > Dear Group, > > > > > > Why is it necessary to configure all routers in a network > > > with "ip route > > > xxx.xxx.xxx.xxx null 0" statement before implementing > > > migrating to a new IP > > > address scheme and DHCP service in the network. > > > > > > Somebody please help!!!!!!!! > > > > > > Regards, > > > > > > Preye. > > > > > > > > > > > > > > > > > > > > > > > > --------------------------------- > > > Do You Yahoo!? > > > Yahoo! Tax Center - online filing with TurboTax Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=43099&t=43001 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
