Received: from cherry.ease.lsoft.com (cherry.ease.lsoft.com [209.119.0.109]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id JAA16493 for ; Thu, 19 Jun 2003 09:12:31 -0400 (EDT) Received: from PEAR.EASE.LSOFT.COM (209.119.0.19) by cherry.ease.lsoft.com (LSMTP for Digital Unix v1.1b) with SMTP id <0.00A20ADD@cherry.ease.lsoft.com>; Thu, 19 Jun 2003 9:12:30 -0400 Received: from PEACH.EASE.LSOFT.COM by PEACH.EASE.LSOFT.COM (LISTSERV-TCP/IP release 1.8e) with spool id 45941797 for OSPF@PEACH.EASE.LSOFT.COM; Thu, 19 Jun 2003 09:12:18 -0400 Received: from 155.53.12.9 by WALNUT.EASE.LSOFT.COM (SMTPL release 1.0i) with TCP; Thu, 19 Jun 2003 09:12:18 -0400 Received: from redback.com (login003.redback.com [155.53.12.55]) by prattle.redback.com (Postfix) with ESMTP id EF1DD1E744D for ; Thu, 19 Jun 2003 06:10:23 -0700 (PDT) User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.2) Gecko/20030208 Netscape/7.02 X-Accept-Language: en-us, en MIME-Version: 1.0 References: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Message-ID: <3EF1B5D2.2010304@redback.com> Date: Thu, 19 Jun 2003 09:08:34 -0400 Reply-To: Mailing List Sender: Mailing List From: Acee Lindem Subject: Re: OSPF Link State Advertisement To: OSPF@PEACH.EASE.LSOFT.COM Precedence: list Content-Transfer-Encoding: 7bit Hi Ameya, Ameya Pandit wrote: > Thanks!! ... the reason i am asking this is because an NMS (Network > Management Software) uses SNMP queries for getting routing specific > information. Hence, whenever the NMS receives a 'trap' message from the > router for a specific LSA (assume an event is configured when an LSA is > received) then i need to get the neighbor that had forwarded the LSA. The OSPF MIB doesn't have a trap defined for reception of an LSA. The OSPF flooding process should be precede very quickly and, IMHO, it doesn't really make sense to try and monitor it using SNMP. > > Using SNMP and OSPF-MIBs, we can query Object Identifiers (OID) for getting > the details of the LSA. However, I did not find a way of getting the > neighbor from where the LSA was forwarded. One of the workarounds I was > thinking for this was to issue a particular command (if any) to get the > neighbor and thereby the ifIndex. In some manner or the other I need to > know > the neighbor that had forwarded the LSA. > > Hope i was clear here. > > Regards > Ameya > > >> From: Acee Lindem >> Reply-To: Mailing List >> To: OSPF@PEACH.EASE.LSOFT.COM >> Subject: Re: OSPF Link State Advertisement >> Date: Tue, 17 Jun 2003 11:09:23 -0400 >> >> 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 >>>> Reply-To: Mailing List >>>> To: OSPF@PEACH.EASE.LSOFT.COM >>>> 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 >>>> >>>> _______________________________________________ >>>> Join Excite! - http://www.excite.com >>>> The most personalized portal on the Web! >>> >>> >>> >>> _________________________________________________________________ >>> Wedding blues? Need help? http://www.msn.co.in/Matrimony/ >>> >> >> >> -- >> Acee > > > _________________________________________________________________ > Take this online tour. Win an HCL Beanstalk PC. > http://server1.msn.co.in/sp03/hclbeanstalktour/amazing_winxp.html > -- Acee