null0 is used as an alternative to access-lists. it is a blackhole. so anything routed to it gets dropped automatically. an access-list uses more processor overhead than a null interface and thus if you have a certain part of your network that you don't want to go anywhere, then use a null interface instead of access-lists.
as for why its a floating route or the tie-ins to bgp, thats beyond me and hopefully someone comments on this. bgp makes my head hurt. scott ""Anil Gupte"" wrote in message news:[EMAIL PROTECTED] > I am trying to understand some IP route commands on our router. Several of > them go to Null0 - what does that mean? > > For example, I have > ip route xxx.xxx.xxx.0 255.255.255.0 Null0 200 > > What is this doing? > > I need to add another block of class Cs from the same provider. Do I need > a similar statement to the above? > > Thanx for your help. > Anil Gupte Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=66790&t=66755 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
