Re: OSPF Link State Advertisement

[Acee Lindem <[e-mail]>]

Ameya Pandit wrote:
> Thanks for the clarification. I am trying to find out what you ended up
> saying. :-). Assume that the network is not Ethernet LAN, but a more
> general
> case (point to point as an example where in we do not have a DR and a BDR).
>
> Is there any user specific table (or any command i can issue) that gives me
> the the interface number on which LS-Ack was sent for a particular LSA?.
> LSA
> details are available. I need to know the interface on which LS-Ack was
> sent. I searched through OSPF-MIBs for the same. However I could not find
> any. Hence my query?

Ameya,

I'm not sure what you are trying to do but the interface(s) on which a
particular LSA was/were ack'ed isn't saved as persistent state informtion.
When a packet is sent on an interface, the determination of the ifIndex
corresponding to that interface is a platform specific detail.

Thanks,
Acee




>
> Any ideas are really welcome.
>
> Rgds
> Ameya
>
>
>> From: Don Goodspeed <[e-mail]>
>> Reply-To: Mailing List <[e-mail]>
>> To: [e-mail]
>> Subject: Re: OSPF Link State Advertisement
>> Date: Mon, 16 Jun 2003 14:06:57 -0400
>>
>> Ameya,
>>
>> Remember that LSA are global, but a LS-Ack is acknowledging receipt
>> from a specific neighbor (or a specific DR on a LAN segment), not
>> for the LSA in general.  Therefore, the interface associated with
>> that neighbor and/or DR should always be known.
>>
>> -don
>>
>> ==========================================
>> Hello,
>>
>> I have a query on link State Acknowledgements (LSAck). We know that
>> when a
>> router receives a link state advertisement (LSA) it sends a LSAck for the
>> received LSA. I understand that it is possible to couple different
>> acknowledgements together. However, my question is: how do we
>> determine the
>> 'ifIndex' of the interface on which the router sends the LSAck for the
>> currently received LSA.
>> Is there any way we can find out the interface on which the LSAck was
>> sent
>> knowing the details in the
>> received LSA (viz. Seq, Checksum et. al.). ?? . In other words, i need to
>> know the
>> interface on which the LSA was received.
>>
>> More specifically, I have a requirement where in my Network Management
>> Software needs to know the ifIndex (and eventually the neighbor that sent
>> (forwarded) the LSA) of the interface on which the LSAck was generated
>> for
>> the LSA. I have the details of the LSA. I checked the OSPF MIB however
>> there
>> was no way to get the ifIndex on which the LSA was received.
>>
>> Any guidance would be helpful.
>>
>> Regards
>> -Ameya
>>
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>
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--
Acee