Re: Rip request message

Hi Terry,

  Great input and thanks for the posting.

Regards
Anantha Subramanian Natarajan

On Sun, Aug 16, 2009 at 10:03 AM, Terry Vinson <consultant_at_tnclimited.com>wrote:

> * *RIP uses two basic message types, the RIP Request and RIP Response, both
> of which are sent using the User Datagram Protocol. <
> http://www.tcpipguide.com/free/t_RIPGeneralOperationMessagingandTimers-2.htm#>RIP
> Response messages, despite their name, are used both for routine periodic
> routing table updates as well as to reply to RIP Request messages. Requests
> are sent only in special circumstances, such as when a router first joins a
> network.
>
> I lab'd this up and tossed in a sniffer and figured it would be fun to see
> what happened. The funny thing was the only way I could get the lab to
> generate a "request" was to restart a router or to do the "clear ip route
> *". In the these two cases the router generated a request "an update with
> the command value set to 1 and the address family value set to 0" and a hop
> count of 16. All devices replied with their complete routing tables. So I
> figured I would do a "clear ip route 3.0.0.0" on R1 (this I thought would
> cause the router to send a request that would solicit a single route update.
> It didn't even cause a request to be generated. Looking at the situation, I
> myself can't find a way in normal rip version 2 operation to generate a
> partial update (I haven't tried RIP triggered yet).
>
> Anyone have any suggestions, if we can get it to happen i'll post the
> sniffer traces?
>
> Terry
>
>
> Anantha Subramanian Natarajan wrote:
>
>> Hi All,
>>
>> I have a basic question on RIP.I am understanding 2 types of RIP
>> messages,one is request mesage and the other is response message.While
>> trying to understand the request message,I am able read and understand
>> that
>> the same would be send to the neighbor/s for requesting full or part of
>> the
>> neighbor route table.Assuming this understanding is right,I am trying to
>> understand,when the RIP would request for part of the neighbor route table
>> .I am able to understand that the full table is requested while RIP
>> process
>> initially comes up and like wise when part of the route is requested to
>> the
>> neighbor.
>>
>> Thanks for the help
>>
>> Regards
>> Anantha Subramanian Natarajan
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>> _______________________________________________________________________
>> Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Sun Aug 16 2009 - 10:09:17 ART