Re: AS announcement question (easy)

[alex () yuriev com]

> Hi, sorry for this low-level question, but at least I'm not posting in html.
> :)
>
> My company owns a class C, and we're switching ISPs.  The "new" provider is
> telling us that they can start announcing, without us having to tell the old
> provider to stop announcing.  I.e., a 2-3 day period where both are
> announcing our class C.
>
> This conflicts with my extremely (admittedly)limited knowledge.  Can someone
> let me know if this is OK/not OK?

If you are going to have your link up to both providers during that time, it
would not be a problem. However, if your /24 is nailed into the tables of
your previous provider, and your link to that provider is down, then the old
provider will create a blackhole for /24 for anyone who prefers the path
presented by your old provider.

In general, one really *should* coordinate switching between providers if
ones' announcement is originated by the provider.

Alex

> Thanks in advance,
>
> Mike
>
> Michael Donahue
> WATG
> (949) 574-8500 x261