[Xorp-hackers] Quick Question on RIP implementation in XORP

[Orion Hodson]

Triggered updates are part of the RIP rfc.  Xorp implements them.

cd xorp/rip && grep -i triggered

  - Orion



On Feb 26, 2007, at 1:10 AM, Pallavi Gupta wrote:

> Hello
>
> Just a quick question, RIP was originally designed to send routing
> updates in a time driven fashion, by default, every 30 secs. In
> Cisco's  implementation, RIP also uses triggerred updates in addition
> to the timed updates. I was just wondering if RIP implementation in
> XORP uses just the time driven updates or triggered updates as well. I
> am curious because if XORP doesnt , then I would like to implement the
> triggered updates in RIP in XORP as part of my project. Thanks a
> million.
>
> Regards,
> Pallavi Gupta,
> University College of the Fraser Valley.
> www.ucfv.ca
>
> On 2/19/07, Orion Hodson <oho at acm.org> wrote:
>> RIP notifies the RIB of the routes as it updates their state.  The
>> RIB arbitrates which of the routes it learns from routing protocols
>> make it into the routing table.  The RIB can also redistribute
>> routes, for instance static routes, through RIP.
>>
>> RIP's routing decision code is in rip/route_db.cc.  The packet
>> formats are in rip/packets.hh and the packetization is rip/
>> packet_assembly.hh.
>>
>> The RIB notification code is rip/xrl_rib_notifier.{hh,cc}.  The
>> redistributed route information is managed by the *redist* files.
>>
>> For the most part the string "cost" identifies the routing metric at
>> any point in RIP, with a few exceptional places that use "metric".
>> Replacing the type of cost in the RouteEntry (route_entry.hh) with
>> my_metric_t would probably give you the transitive closure of all the
>> places in RIP that would need changing to support a more
>> sophisticated metric (and a tonne of code that doesn't compile for a
>> while :-).
>>
>> Happy Hacking
>> - Orion
>>
>>
>>
>>
>> On Feb 18, 2007, at 1:20 PM, Pallavi Gupta wrote:
>>
>>> Hello,
>>>
>>> I am a 4th year undergraduate student at a university in Canada.  
>>> I am
>>> doing a research project based on RIP and I am using XORP for
>>> implementation of the changes that I intend to make in the  
>>> protocol. I
>>> am trying to understand the XORP code and I was wondering if someone
>>> could point me out in the right direction. At the moment, I am  
>>> trying
>>> to figure out how XORP processes the routing metrics during path
>>> selection, specifically for RIP.
>>> I intend to change the metric for RIP into a compound of Hop  
>>> count and
>>> delay, if possible.
>>> Thanks soo much, in advance, for your time and help.
>>>
>>> Sincerely,
>>> Pallavi Gupta,
>>>
>>> --
>>> "Little things make big differences in life"
>>>
>>> _______________________________________________
>>> Xorp-hackers mailing list
>>> Xorp-hackers at icir.org
>>> http://mailman.ICSI.Berkeley.EDU/mailman/listinfo/xorp-hackers
>>
>>
>
>
> -- 
> "Little things make big differences in life"
>
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