What, you mean Cisco routers are *not* omnipotent and omniscient? They
*won't* cater to my every whim?? So much for all that Cisco marketing guff
then...
(tongue firmly in cheek, for those who couldn't work that out...)
Thanks for the info, Howard (not tongue in cheek here).
JMcL
---------------------- Forwarded by Jenny Mcleod/NSO/CSDA on 29/11/2000
09:04 am ---------------------------
"Howard C. Berkowitz" <[EMAIL PROTECTED]>@groupstudy.com on 28/11/2000 12:47:42
pm
Please respond to "Howard C. Berkowitz" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
cc:
Subject: Re: IP routing tables
[snipped]
So what, you might very easily ask, does the second stage use to look
up intra-area routes? In the real world, there is a temporary
"routing table." Also in the real world, this would be too large to
keep around, given that it would largely be duplicated in the "main"
routing table (i.e., Routing Information Base). Yes, I can see there
would be interest in having the information for debugging, but my
feeling would be that most implementers think it's too costly.
From the Cisco point of view, if you want to play "what if I remove
this static" games, Netsys is intended for just that purpose. Not
cheap, I recognize.
The description of SPF in RFC2328 is conceptual, and the performance
of an OSPF implementation depends on how efficiently the real
computation is written. Dijkstra's algorithm is 40 years old, and
more efficient approaches exist. See, for example, Tony Lauck's
modification described in Perlman's _Interconnections_ (1st Ed), page
225.
A presentation at the last NANOG reviews current approaches to
millisecond-range IGP convergence:
http://www.nanog.org/mtg-0010/igp.html While the research here
involved IS-IS, it's still applicable. There is enough interest in
millisecond convergence that if there were spare resources in the
router, I'm afraid supporting this is a higher priority than
what-if's.
>[snipped]
>>
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