On Sun, 23 Sep 2007 [EMAIL PROTECTED] wrote:
Has everyone forgotten the "Tier 1 depeerings" of several
years ago? i.e.
If you were pointing default at C&W, PSINet, Cogent, or
Level3 when they each had or caused depeering issues, parts
of the internet ceased to be reachable. In such cases,
having full routes from multiple providers was the only way
to be automatically protected from such games.
Not so. Anyone who had sufficient transit was also protected from
the games. Lots of so-called regionals and tier-2 networks were
shielded from this monkey-business. And, of course, they shielded
their customers as well. A tier-1 network operator who operates such
a fragile network becomes a single point of failure. And not just
because of peering as the AT&T frame relay collapse shows.
I think you've completely missed what I said. If you were pointing
default at C&W (whether they were your only connection, or you were
"multihomed" but couldn't handle full routes, so perhaps you had customer
routes from each provider and default pointing at C&W) when they depeered
PSI, single homed (or similarly configured non-full routes) customers of
PSI ceased to be reachable. A long time customer of mine was hit by this
(their business required communications with one or more single homed
PSI customers, and C&W was their sole transit). It was the driving force
behind their multihoming. Ever since, they've maintained 3 or more
transit providers and full routes from each.
----------------------------------------------------------------------
Jon Lewis | I route
Senior Network Engineer | therefore you are
Atlantic Net |
_________ http://www.lewis.org/~jlewis/pgp for PGP public key_________
