We are also multihomed to separate providers. When researching our plans, I
found that a /24 was about as small as you could go and still have a chance
of being reachable from most of the internet. One provider required that we
have at least a /24, and the other highly recommended it.
Even if both of your providers will accept something smaller, they have no
control over what other providers will do to your routes. With anything
smaller than a /24 they will probably be filtered, as you seem to be
noticing.
HTH,
John
On Mon, 12 Mar 2001 17:35:42 -0800, Gary Crouch wrote:
> What is the smallest network that can support BGP ?
> we have a /27 network with two ISP UUNET and @work=20
> when the router is full configured for load balancing traffic going out =
> the @work connection does not come back
> router reports destionation net unreachable
>
> UUNET say /27 is not a problem=20
> @work say we need a least a /24 network=20
>
> when UUNET fail over we have no traffic come back over the @work
connection=
> .
>
> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
> <HTML><HEAD>
> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
> <META content="MSHTML 5.50.4611.1300" name=GENERATOR></HEAD>
> <BODY style="MARGIN-TOP: 2px; FONT: 8pt Tahoma; MARGIN-LEFT: 2px">
> <DIV><FONT size=1>What is the smallest network that can support BGP
> ?</FONT></DIV>
> <DIV><FONT size=1>we have a /27 network with two ISP UUNET and @work
> </FONT></DIV>
> <DIV><FONT size=1>when the router is full configured for load balancing
traffic
> going out the @work connection does not come back</FONT></DIV>
> <DIV><FONT size=1>router reports destionation net
unreachable</FONT></DIV>
> <DIV><FONT size=1></FONT> </DIV>
> <DIV><FONT size=1>UUNET say /27 is not a problem </FONT></DIV>
> <DIV><FONT size=1>@work say we need a least a /24 network </FONT></DIV>
> <DIV><FONT size=1></FONT> </DIV>
> <DIV><FONT size=1>when UUNET fail over we have no traffic come back over
the
> @work connection.</FONT></DIV>
> <DIV><FONT size=1></FONT> </DIV>
> <DIV><FONT size=1></FONT> </DIV>
> <DIV><FONT size=1></FONT> </DIV>
> <DIV><FONT size=1></FONT> </DIV>
> <DIV><FONT size=1></FONT> </DIV></BODY></HTML>
>
> _________________________________
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