One /22 Two ISP no BGP

Michael Smith msmith at
Fri Feb 6 18:20:14 UTC 2009

Ebgp multi-hop is a great idea.

Have others seen this done for non-bandwidth customers?  ...a 'bgp-only' service...?...

...catalog that right along with v6 and multicast tunnels...

----- Original Message -----
From: Joe Maimon <jmaimon at>
To: Jason Biel <jason at>
Cc: nanog at <nanog at>
Sent: Fri Feb 06 13:13:14 2009
Subject: Re: One /22 Two ISP no BGP

Jason Biel wrote:
> Charles,
> As I mentioned earlier, you'll want to have one provider announce the /22
> unweighted and the other announce it weighted.  Just pick the better of the
> two providers as the primary.  Don't base it soley off bandwidth, but check
> your SLA and any recent outage occurances.
> Traffic will flow in via the primary until that link to you drops, the
> provider will remove the route, and traffic will come in the back up route.

Perhaps ebgp-multihop with this ISP's upstream provider might offer you 
an advantage combined with this approach.

Probably worth a try.

> On Fri, Feb 6, 2009 at 11:14 AM, Charles Regan <charles.regan at>wrote:
>> I'll explain. We are a small ISP on a very remote Island.
>> We have a /22 from ARIN. We have a 20mbits pipe from ISP1 and 20mbits from
>> ISP2.
>> They are the only two we can get bandwidth.
>> So we are stuck with ISP1 that doesn't support BGP.
>> On Fri, Feb 6, 2009 at 12:48 PM, Azinger, Marla
>> <marla.azinger at> wrote:
>>> im curiouse.  you probably had a reason for wanting to do that.  So cant
>> you find another ISP that will do what you want?
>>> Cheers
>>> Marla
>>> -----Original Message-----
>>> From: Charles Regan [mailto:charles.regan at]
>>> Sent: Friday, February 06, 2009 8:29 AM
>>> To: nanog at
>>> Subject: One /22 Two ISP no BGP
>>> I want to advertise my /22 to two different ISP on different POP.
>>> I can't use BGP as ISP1 doesn't support it.
>>> Any suggestions ?
>>> Thanks,
>>> Charles

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