[Xorp-hackers] Hello!, Help needed on RIP module in XORP

[Orion Hodson]

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"
>
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