I understand split horizon and poison reverse. I was just wondering how
you might apply those tools to a link state protocol like OSPF. It's my
understanding that they are used in DV protocols only and are not
necessary in LS protocols.
John
>>> "Dennis H" 7/10/01 7:12:11 AM >>>
Here's a link which might be of use... It describes split horizon
which
means a router will not advertise a route back out the same interface
that
it was learned from. Poison reverse is similar except it WILL
advertise the
route as unreachable back through the same interface it was learned
from (as
opposed to not advertising it).
http://www.cisco.com/warp/public/779/smbiz/service/knowledge/wan/subifs.htm
Dennis
""John Neiberger"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Split Horizon with Poison Reverse in OSPF? Could you elaborate on
how
> these might work with OSPF?
>
> John
>
> >>> "Dennis H" 7/9/01 1:42:22 PM >>>
> Split horizon and poison reverse... just make sure to investigate
how
> these
> operate with OSPF and frame relay configurations. There are several
> caveats
> to be aware of.
>
>
> ""Stephen Skinner"" wrote in message
> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > guys,
> >
> > see if you can help me with a senario i am working on for the exam
> >
> > 8 routers
> >
> > a,b running HSRP connected to eachother and c,d via 100 meg
ethernet
> >
> > c,d Runiing connected to eachother and a,b via 100 meg ethernet
> >
> > c,d connected to e,f via frame relay
> >
> > c is primary frame
> >
> > d is backup ...NO load balancing atall
> >
> >
> > g,h running HSRP connected to eachother and c,d via 100 meg
ethernet
> >
> > e,f running ethernet to eachother and c,d via 100 meg ether
> >
> > e,f running frame relay to c,d
> >
> > primary frame c,e backup frame d,f
> >
> > the 8 routers are split over 2 sites
> >
> > eigrp is running on a,b,c,d,e,f
> >
> > ospf is running on e,f,g,h
> >
> > Q1 various sets of router (a,b and g,h) can advertise various
routes
> to
> > multiple routers (ab to c and d) (gh to e and f) thus the
possiblilty
> of
> > routing loops (on LAN) could occour ....how can i stop this...
> >
> >
> >
> > i have more questions but i will post them one at a time......
> >
> > i have encluded a BMP file on this email with the design in it
> >
> >
> >
>
_________________________________________________________________________
> > Get Your Private, Free E-mail from MSN Hotmail at
> http://www.hotmail.com.
> >
> > [GroupStudy.com removed an attachment of type image/bmp which had
a
> name
> of
> > 1-secmap.bmp]
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