RIPv2, incorrect metric changes

[Ondrej Filip]

On Tue, 22 Jun 2004, RATM wrote:

> Hi all,

Hello!

> I apologize if this topic has already been discussed on the mailing list, but I couldn't find a 
> message archive to check it out. And, I apoligize for my poor English.
> 
> My problem is that the BIRD RIPv2 daemon doesn't accept a worse metric coming from the router which 
> is the nexthop for that entry. I'll paste some sniffed packet to give the whole idea.
> This network is very simple - 2 routers (200.0.0.1 and 200.0.0.2) with 4 interfaces each:
> 
> Frame 1 (106 bytes on wire, 106 bytes captured)
> Internet Protocol, Src Addr: 200.0.0.1 Dst Addr: 224.0.0.9
> Routing Information Protocol
>      IP Address: 200.0.6.0, Metric: 2
>      IP Address: 200.0.5.0, Metric: 2
>      IP Address: 200.0.4.0, Metric: 2
> 
> /*	The metric is 2.		*/
> 
> 
> 
> Frame 3 (106 bytes on wire, 106 bytes captured)
>      Arrival Time: Jun 16, 2004 18:19:14.496397000
> Internet Protocol, Src Addr: 200.0.0.1 Dst Addr: 224.0.0.9
> Routing Information Protocol
>      IP Address: 200.0.6.0, Metric: 5
>      IP Address: 200.0.5.0, Metric: 5
>      IP Address: 200.0.4.0, Metric: 5
> 
> /*	Here I changed the default metric to 5. And now 200.0.0.1 begins announcing its directly 
> connected networks with a metric of 5; anyway, 200.0.0.2 (whose hostname is r1) doesn't change the 
> metric in its route table as you can see below:
> 
> r1:~# birdc
> BIRD 1.0.6 ready.
> bird> show route
> 127.0.0.0/8        dev lo [direct1 18:12] (240)
> 200.0.0.0/24       dev eth0 [direct1 18:12] (240)
> 200.0.1.0/24       dev eth1 [direct1 18:12] (240)
> 200.0.2.0/24       dev eth2 [direct1 18:12] (240)
> 200.0.3.0/24       dev eth3 [direct1 18:12] (240)
> 200.0.4.0/24       via 200.0.0.1 on eth0 [MyRIP 18:25] (120/2)  <----
> 200.0.5.0/24       via 200.0.0.1 on eth0 [MyRIP 18:25] (120/2)  <----
> 200.0.6.0/24       via 200.0.0.1 on eth0 [MyRIP 18:25] (120/2)	<----
> 
> I left the arrival time information in the second packet to let you compare it with the time 
> displayed in the show route output.
> Any ideas?

Plase can you enable 'debug MyRIP all' on both routers and send it to me?

				Feela