[quagga-dev 8879] Re: LSA checksum error on quagga 0.99.17

Denis Ovsienko infrastation at yandex.ru
Fri Sep 30 09:57:52 BST 2011


30.09.2011, 11:32, "Jaroslav Fojtik" <jafojtik at seznam.cz>:
> Dears,
>
> time to time I am receiving tons (hundreds megabytes up to gigabytes) of these messages.
> I have quagga 0.99.17 (same problem observed on 0.99.16). Linux kernel is Linux 2.6.39.4.
> but a same problem occurs on 2.6.32.11.
>
> This message is completely stupid, when repeated 100 times per second (or faster).
> It is absolutelly impossible to identify a source of wrong LSA checksum packets.
>
> 2011/09/29 02:05:59 warnings: OSPF: Link State Update: LSA checksum error d9d4, dad2.
> 2011/09/29 02:05:59 warnings: OSPF: Link State Update: LSA checksum error d9d4, dad2.
> 2011/09/29 02:05:59 warnings: OSPF: Link State Update: LSA checksum error d9d4, dad2.
> 2011/09/29 02:05:59 warnings: OSPF: Link State Update: LSA checksum error d9d4, dad2.
> 2011/09/29 02:05:59 warnings: OSPF: Link State Update: LSA checksum error d9d4, dad2.
> 2011/09/29 02:05:59 warnings: OSPF: Link State Update: LSA checksum error d9d4, dad2.
> 2011/09/29 02:05:59 warnings: OSPF: Link State Update: LSA checksum error d9d4, dad2.
> 2011/09/29 02:05:59 warnings: OSPF: Link State Update: LSA checksum error d9d4, dad2.
> 2011/09/29 02:05:59 warnings: OSPF: Link State Update: LSA checksum error d9d4, dad2.
> 2011/09/29 02:05:59 warnings: OSPF: Link State Update: LSA checksum error d9d4, dad2.
> 2011/09/29 02:05:59 warnings: OSPF: Link State Update: LSA checksum error d9d4, dad2.

I can confirm this bug exists for a long time. It steadily reproduces (not as often as in your case) and is tracked internally on my side, I didn't think anyone else observed it ever. The root cause identified so far is that in narrow cases LSAs sent by Quagga do indeed contain a wrong checksum. Could you open a bugzilla record for this? I would appreciate your feedback on the fix, once it is available.

-- 
    Denis Ovsienko



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