Subject: Re: ospf-scalability-04.txt

From: Vivek Dubey <[email-masked]>
Date: Wed, 21 May 2003 05:28:55 -0000

Gagan,

2. Recommendations

(1) ......"While receiving a packet from a neighbor
and while transmitting a packet to a neighbor,
try to process a "high priority" packet ahead
of a "low priority" packet"

Few questions
-------------
Mainly from implementors view ............

The point to treat packets with higher/lower
priority based on receiving from particular
NBR is not very clear.

1)
OSPF might be having multiple interfaces (each
interface in turn having multiple NBRs).

IP will pass all OSPF packets ...where they
can be treated with high/low priority based
on above classification. So while processing
these high priority packets (hellos/acks), is it
required to choose them as per NBR ....... if so
which NBR will be given higher priority.

It would be better if we just process all
hellos/acks with higher priority (won't
it save much overhead).

2)
Ospf acks (delayed ones also) are sent
in response to LSU packets. So to give priority
to a "ack to be transmitted to a NBR", received LSU
should be processed fast.
Not very clear to me...... is there some conflict here ???

thanks,
vivek

On Tue, 20 May 2003 Choudhury, Gagan L, ALABS wrote :
>Hi All,
>    This is a revised version based on comments on the list and
>comments
> from the WG chairs.  Main changes are in Section 2
>(Recommendations) and
>Appendix C (Other Recommendations).  We would like to thank
>everybody who
>provided comments for significantly improving the quality of the
>draft.
>
>         Gagan Choudhury
>
>-----Original Message-----
> From: [email-masked]
>[mailto:[email-masked]]
>Sent: Tuesday, May 20, 2003 7:27 AM
>To: [email-masked]
>Subject: I-D ACTION:draft-ietf-ospf-scalability-04.txt
>
>
>A New Internet-Draft is available from the on-line
>Internet-Drafts directories.
>This draft is a work item of the Open Shortest Path First IGP
>Working Group of the IETF.
>
>         Title           : Prioritized Treatment of Specific OSPF
>Packets and
>                           Congestion Avoidance
>         Author(s)       : G. Choudhury et al.
>         Filename        : draft-ietf-ospf-scalability-04.txt
>         Pages           : 18
>         Date            : 2003-5-19
>
>This document recommends methods that are intended to improve
>the
>scalability and stability of large networks using OSPF (Open
>Shortest
>Path First) protocol.  The methods include processing OSPF Hellos
>and
>LSA (Link State Advertisement) Acknowledgments at a higher
>priority
>compared to other OSPF packets, and other congestion avoidance
>procedures. Simulation results in support of some of the
>recommendations are given in the appendix sections.
>
>A URL for this Internet-Draft is:
>http://www.ietf.org/internet-drafts/draft-ietf-ospf-scalability-04.txt
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