RE: Split Horizon

Sounds accurate to me, I might include port numbers too, depending on how the question is worded.

-ryan

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Ravi Singh
Sent: Thursday, April 23, 2009 7:10 AM
To: Anthony Sequeira
Cc: Robin Betterley; ccielab_at_groupstudy.com
Subject: Re: Split Horizon

Hi Anthony,

I like today's core knowledge question, however are we OK to say that
BGPv4 packets are designated by IP protocol 6. TCP is designated by IP
protocol number 6 and BGP uses TCP as its underlying transport
protocol.So ideally it is a TCP packet that is designated by IP
protocol 6 .

I mean RIP uses UDP so if we say that RIP packets are designated by IP
protocol 17 , will that be a correct statement ?

Hope I am not asking something silly ;-)

Thanks
Ravi

On Thu, Apr 23, 2009 at 2:12 PM, Anthony Sequeira
<asequeira_at_internetworkexpert.com> wrote:
> I would also be aware of the Poison Reverse exception to split horizon. This
> allows a critical exception when a route needs to be marked as unreachable.
>
> Warmest Regards,
>
> Anthony J. Sequeira, CCIE #15626
> Senior CCIE Instructor
> http://www.InternetworkExpert.com
>
> Internetwork Expert, Inc.
> Toll Free: 877-224-8987
> Outside US: 775-826-4344
>
> Test your Core Knowledge today!
> Q: BGPv4 packets are designated by which IP protocol number?
> A: six
> More Info: http://www.iana.org/assignments/protocol-numbers/
>
> On Apr 23, 2009, at 9:03 AM, Robin Betterley wrote:
>
>> Hi GS,
>>
>> The basic principle is simple: Information about the routing for a
>> particular packet is never sent back in the direction from which it
>> was received.
>>
>> Is there any other known principle of split horizon?
>>
>> Cheers,
>> R.B
>>
>>
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Received on Thu Apr 23 2009 - 10:15:04 ART