This may take some explaining, so just bear with me. Also keep in mind that
I've been having hardly any time to read Halabi's BGP book, but will
probably go read some after this.
We're connected to a few ISPs which allow BGP peering (which I should be
settings up sometime soon). We've also got two ISPs that will not peer, nor
exchange customer routes with us. One is a free 1.5mbit SDSL connection as
we're one of their VARs, the other is a lame T1 that we're stuck in a 3 year
contract for a bit more.
Right now, I just use static routes to send traffic out the SDSL connection
as the provider only has a single class B. For the T1 to a much larger
provider with address space all over, it's just not worth it to try and do
much with it...
Anyway, here is the thought: I happen to know the admins a at number of
other ISPs that are connected to the T1 and some other sites that have SDSL
access to the same provider as us.
The catch is that of course we could set static routes out to these ISPs,
but it's somewhat risky, especially with the SDSL as even though the
ethernet interface it's connected to may still be up, the SDSL line itself,
or perhaps something along the SDSL provider's backbone might be down
between us and another of the SDSL customers, but the static routes to the
SDSL link would stay up as the interface is still up. Same is true with the
T1.
Since neither of these ISPs will peer with us, could we still establish some
routing protocol with the smaller ISPs like us that are connected off of
them and want to transit traffic through these lesser used links.
Otherwise, the netblocks we have would route traffic back through the ISPs
they belong to or that we're announcing them with BGP on.
The biggest thing is that it needs to be dynamic. If the route over the
common single upstream ISP is down, but the connections to these ISPs are
up, routes out to our defaults/BGP peers might still get us connected.
Thoughts? Comments? Am I just nuts?
--
Jason Roysdon, CCNP+Security/CCDP, MCSE, CNA, Network+, A+
List email: [EMAIL PROTECTED]
Homepage: http://jason.artoo.net/
Cisco resources: http://r2cisco.artoo.net/
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