[Xorp-hackers] OLSR seems to be mostly working, but no subnet routes

Ben Greear greearb at candelatech.com
Wed Jul 8 09:54:19 PDT 2009

Bruce Simpson wrote:
> Ben Greear wrote:
>> I'm doing some testing with OLSR (plus my hacks to make it work with
>> multiple router tables and multiple instances of xorp).
>> I thought it was working previously, but I wasn't paying close enough
>> attention.  It is adding routes to individual interfaces, but no 
>> subnet routes,
>> so traffic won't actually flow across my network.
> Off the top of my head, this would be by design -- OLSR doesn't add 
> subnet routes for interfaces, as it's a peer-to-peer protocol -- 
> unless you explicitly configured an HNA advertisement somewhere. It 
> doesn't do any kind of auto summaries or anything like that. It's been 
> a while since I wrote that code, though.
> Are you sure the regression tests continue to run OK with your 
> changes? Some of them are quite detailed and incomplete (it can be 
> difficult to make sure the timings are right, and the OLSR tests would 
> often fail on slow or old machines due to timer aliasing). But HNA 
> should get tested in there.
> The only thing that multiple interfaces would turn on in the protocol 
> is MID. Subnet routes never appear in OLSR unless explicitly 
> advertised in HNA messages.
Looks like I need to figure out how to do this HNA thing then.  It 
doesn't do me so much good to talk
to just routers...I really want to talk to systems connected to them, 
thus the need for somehow propagating
subnet routes.


Ben Greear <greearb at candelatech.com> 
Candela Technologies Inc  http://www.candelatech.com

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