RIP not doing "triggered update" following route deletion

[Tore Anderson]

Hello Ondrej,

I wonder if anything more happened with this problem? As far as I can
tell, the issue persist with BIRD 1.4.5, no triggered updates with
metric 16 is transmitted when a route is removed. Also, the "rip" branch
fails to compile for me now.

Tore

* Tore Anderson

> * Ondrej Filip
> 
>> unfortunately, the current RIP code is broken. I tried to fix this in
>> git branch rip, but hasn't been merged into master yes. But if you
>> have some capacity to test this branch, it would be very helpful.
> 
> Hi Ondrej,
> 
> I'll be happy to help out testing this branch. Here's my initial
> observations:
> 
> 1) Routes that are removed from the routing table do get advertised with
> metric infinity (16), and this update gets retransmitted five times. Great!
> 
> 2) RIP seems to only be sending updates only at regular tick intervals
> (every 30 seconds). This means that there is a delay after
> adding/removing an address of up to 30 seconds before the neighbours get
> informed of the change. BIRD 1.4.0 fares better (for additions).
> 
> FWIW, here are the timestaps of when I added/removed addresses and when
> BIRD passed that information along. I confirmed that the
> additions/removals showed up in "birdc[6] show route" pretty much
> instantly, so it's the RIP protocol that's laggy:
> 
> 09:45:11         - ip address add 192.0.2.1/32
> 09:45:22 (+11s)  - RIP announcement going out
> 
> 09:46:23         - ip address add 2001:db8::1/128
> 09:46:51 (+28s)  - RIP announcement going out
> 
> 09:47:45         - ip address del 192.0.2.1/32
> 09:47:53 (+8s)   - RIP announcement going out
> 
> 09:48:24         - ip address del 2001:db8::1/128
> 09:48:51 (+27s)  - RIP announcement going out
> 
> 3) RIPng appears to be advertising some bogus routes (but only when it's
> also advertising a sane route), as seen here:
> 
> 09:47:21.635383 IP6 fe80::225:b5ff:fe00:ce.ripng > ff02::9.ripng:  ripng-resp 3: ffff:3:2c:114:9912:753::/0 2001:db8::1/128 (1) ffff:1:c917:28a0:b99c:3132:fd5d:283b/96 [48667] (166)
> 09:47:51.906476 IP6 fe80::225:b5ff:fe00:ce.ripng > ff02::9.ripng:  ripng-resp 3: ffff:3:2c:114:b812:753::/0 2001:db8::1/128 (1) ffff:1:917e:57b1:6814:f716:c44b:a652/187 [57261] (210)
> 
> The PCAP and config files are attached.
> 
> Tore
>