At 11:40 AM 07/09/97 -0400, Mark Horn [ Net Ops ] wrote:
>
>I'd love to hear more data about BGP convergence from people who are using
>BGP ... pferguso @
cisco .
com?
>
>>Most routers are definitely not up to updating a
>>route through BGP. Besides, how are you going to switch between CIDRs? If
I am
>>using a Sprint Class B or C IP block how am I going to route it through
MCI?
>
>Both of these issues are legitimate. BGP gobbles memory, especially if
>you're getting full Internet routes. BGP also requires that you have
>portable address space - a rare commodity.
>
The amount of time it takes to converge routing with BGP depends on:
o the computational platform -- the more CPU horsepower, the faster
the path recalculation;
o available computational resources;
o the number of prefixes;
o the number of AS_PATHS;
o the number of BGP peers;
o the volume of announcements and/or withdrawals.
Of course, one could also suggest that the speed of the links
interconnecting the BGP speakers has an effect on the rate at
which routing will reconverge, since a faster link will transfer
announcement & withdrawal information quicker than a slower link.
I have no idea what you are referring to with regards to "BGP also
requires that you have portable address space" -- this is certainly
incorrect. Perhaps you meant something else, or meant it in a
different context?
>Having only looked at it superficially, dynamic DNS + NAT seems like a
>workable solution when BGP isn't available. But if BGP is available, it
>seems better. And that's simply on a performance basis. BGP also
>provides policy setting that DNS doesn't.
>
Exactly how does NAT and DNS provide for the announcement of AS's
and/or prefixes into the global routing system?
- paul
>--
>Mark Horn <mhorn @
funb .
com>
>
>PGP Public Key available from: http://www.es.net/hypertext/pgp.html
>PGP KeyID/fingerprt: 00CBA571/32 4E 4E 48 EA C6 74 2E 25 8A 76 E6 04 A1
7F C1
>
--
Paul Ferguson || ||
Consulting Engineering || ||
Herndon, Virginia USA |||| ||||
tel: +1.703.397.5938 ..:||||||:..:||||||:..
e-mail: pferguso @
cisco .
com c i s c o S y s t e m s
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