Hi, On Wed, Aug 28, 2013 at 11:22:06PM +0300, Ahmed Hilmy wrote: > Hi Friends, > when i force prefix Z to be advertised to ISP A only and to ISP B only when > ISP A is down. > does my end customer will face an outage or a flap ?
Of course. While BGP is converging, the link to A is broken and B is not
yet active, and C-behind-B will not see the advertisement for even longer.
> i want that the
> recovery time should be fast enough that the customer will not be able to
> sense it.
Announce your prefixes to all upstreams all the time, do not change
announcements on a whim (as in "take instability on A, make it into
instability on B").
> Does conditional advertisement do that ?
Understand BGP.
Understand "convergence" and "routing propagation", then reexamine what
you want to achieve.
(And *please* learn to quote)
gert
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Gert Doering - Munich, Germany [email protected]
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