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Re: Multihoming - Resilience or Independence

  • To: "Nipper, Arnold" < >
  • From: Steven Bakker < >
  • Date: 10 Oct 2001 17:08:19 +0200
  • Cc: Stephen Burley < >
    Gert Doering < >
    Dave Pratt < >
On Wed, 2001-10-10 at 15:24, Nipper, Arnold wrote:
> Of course another prefix and another AS is added to the routing table
> but thereby you are witdrawing at least more than two (both prefs as well as
> AS). ==> table gets smaller.

Your math is confusing... or maybe I'm misunderstanding the obvious. 
Yes, multihoming adds another AS and (at least one) (longish) prefix to
the routing table.  But in your reasoning, which two prefixes and one AS
are being withdrawn?  If I resiliently multi-home to one ISP, and I get
my address space from its block, I do not add any prefix or AS to the
(global) routing table.  Even if I multi-home to two ISPs and
selectively NAT depending on the outgoing connection, I'll be NAT-ing
into the respective ISP's address space (which I presume is properly
aggregated), adding no prefix or AS.

Cheers,
Steven
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