Re: [Lsr] RFC4750: OSPF Version 2 Management Information Base

"Acee Lindem (acee)" <acee@cisco.com> Wed, 09 December 2020 12:45 UTC

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Tulasi Rami Reddy N <tulasi.ietf@gmail.com>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] RFC4750: OSPF Version 2 Management Information Base
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Date: Wed, 9 Dec 2020 12:45:49 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/nWtctVPoFb76dh_YJvlR4UVCRxI>
Subject: Re: [Lsr] RFC4750: OSPF Version 2 Management Information Base
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Hi Tulasi,
You definitely shouldn’t generate the netMaskMismatch trap as this is for mask mismatch detection on hello packets. You could generate the ospfIfRxBadPacket but many do not for this case.
Thanks,
Acee

From: Lsr <lsr-bounces@ietf.org> on behalf of Tulasi Rami Reddy N <tulasi.ietf@gmail.com>
Date: Wednesday, December 9, 2020 at 6:11 AM
To: "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] RFC4750: OSPF Version 2 Management Information Base

[ Sorry, My previous mail was truncated]
Hi ,

OSPFv2 adjacency will be formed on a numbered LAN only below both conditions are met:
           1. Common IP subnet
           2. Matching network mask.
From the OSPFv2 MIB, there is only one error defined.

     ospfConfigErrorType OBJECT-TYPE
          SYNTAX       INTEGER {

                          netMaskMismatch (7),
           }

I believe this is for the case 2 (when mask is mismatched).

Let's take below example:

  RTA    (11.1.1.2/24<http://11.1.1.2/24>)   --------     (10.1.1.1/24<http://10.1.1.1/24>) RTB

Here, src IP is not matching to the Rx interface IP subnet, then what is the error type to be set?
Should this be considered as generic input processing error and only generate
ospfIfRxBadPacket notification or netMaskMismatch  notification?
Should we need a new type here?

"
The generic input processing of OSPF packets will
have checked the validity of the IP header and the OSPF packet
header."



Thanks,
Tulasi.
On Wed, Dec 9, 2020 at 4:27 PM Tulasi Rami Reddy N <tulasi.ietf@gmail.com<mailto:tulasi.ietf@gmail.com>> wrote:
Hi ,

OSPFv2 adjacency will be formed on a numbered LAN only when
           1. Common IP subnet
2.matching network mask.
From the

Thanks,
TUlasi.