RE: [isp-bgp] splitting the network and BGP

["JENSEN, Joachim" <joa@...>]

> From: Rob Genovesi [mailto:rob@...]
>
> Can SITE-B still advertise networks that are provided from
> ISP-1 and vice-versa? 

Hi Rob,

You can only announce PI assinged addresses via any ISP, so if ISP-1 is
providing you with the addresses (owns them), then the answer is NO

> Can the two sites still use the same
> (public) ASN
> even though there is no direct connection between the two?

Nope! you can't have a setup this.. When you have a customer/user on SITE-A,
that tries to reach network on SITE-B, the packets will be dropped by the
BGP speaking router you have on SITE-B.. This is normal behavior, when you
recieve prefix with origin of own AS via EBGP..

You need an IBGP session between the two sites.. If you don't have a
dedicated physical link, you can maybe setup a GRE tunnel over the internet,
and get the IBGP session up via this, but I wouldn't recomend this on long
term solution.

> 
> We have IP network blocks assigned by ISP-1 but I want to use them 
> primarily at SITE-B where there is no direct connection to ISP-1.

Again.. You can't announce addresses owned by ISP-1 via another ISP.

Best regards

Joachim Jerberg Jensen





-pls. disregard fuc*!G disclamer!


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