[Xorp-users] Partial fix found for : OSPF routes are lost/missing after a few hours

[Ben Greear]

On 01/18/2013 09:25 AM, Mellen, Ivan wrote:
> Hi,
>
> In XORP 1.8.5,  OSPF routes are being dropped when there are more than 100 OSPF routes. Once dropped these routes do not recover.
>
> Depending on the processing power  of the PC, this bug can be reproduced anywhere from 100 to 700 routes and the time when routes are lost can be as low as one
> hour to several days.
>
>                  After examining Wireshark logs and looking through the XORP code the problem seems to be the way XORP packages route updates. There is only one
> route per LSA and when an OSPF refresh starts(after one hour) OSPF receivers can be overloaded with packets.
>
>                  A simple fix is to apply the below patch which adds a small delay between transmitting LSA packets. Of course the proper fix is to put more
> than one route in an LSA packet but this is a lengthy change to OSPF.
>
> *** peer.cc    19 Jan 2012 20:28:20 -0000    1.1
> --- peer.cc    11 Dec 2012 00:20:14 -0000    1.2
> ***************
> *** 4112,4117 ****
> --- 4112,4119 ----
>
>        _peer.transmit(tr);
>
> +     usleep(50000);
>        return true;
>    }

I fixed some OSPF convergence issues related to bad OSPF retry timers
(or something like that) some time back...I wonder if that is what you
are hitting.

Can you try top-of-tree xorp (without the hack above) and see if that
works better?

Either way, I'm reluctant to apply this sort of patch upstream...

Thanks,
Ben

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