GroupStudy.com GroupStudy.com - A virtual community of network engineers
 Home  BookStore  StudyNotes  Links  Archives  StudyRooms  HelpWanted  Discounts  Login
Re: IP route to Null0? [7:66755] posted 04/03/2003
[Chronological Index] [Thread Index] [Top] [Date Prev][Date Next] [Thread Prev][Thread Next]


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:200304031540.h33FeGHD012687@xxxxxxxxxxxxxxxxx
> 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 abuse@xxxxxxxxxxxxxx