One /22 Two ISP no BGP

Steve Bertrand steve at
Fri Feb 6 17:18:23 UTC 2009

Jason Biel wrote:
> The link that goes down will trigger that provider to remove the route,
> traffic will swing and start coming in on the backup link.

This is assuming that 'ISP1' has the capability to advertise the OP's
route in the first place.

What if ISP1 is simply a customer of another ISP, using PA space, and
just reselling connectivity?

Charles, you really need to find out what others have asked... can the
ISP1 advertise your block of space for you, or do they really mean that
they *can't* do BGP at all.


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