will ISP peer with 2 local WAN routers?

Peter Kristolaitis alter3d at alter3d.ca
Fri Aug 16 21:29:42 UTC 2013


But the switches themselves are a single point of failure, so if a 
switch dies you still only have a single provider (assuming one switch 
per provider).  ;)

All you're doing is moving the your single point of failure from the 
routers to the switches, with arguably very little increase in actual 
reliability (if any, depending on whether you think switches are less 
likely to fail than routers).

- Pete



On 08/16/2013 05:21 PM, Adam Greene wrote:
> Thanks, Justin. Yes, we considered that option, too. But then if one WAN
> router goes down, the customer will only have connectivity through a single
> upstream provider. We'd prefer to maintain connectivity to both even if a
> router fails. Switches in front of the routers is no problem.
>
> -----Original Message-----
> From: Justin Vocke [mailto:justin.vocke at gmail.com]
> Sent: Friday, August 16, 2013 4:47 PM
> To: Adam Greene
> Cc: <nanog at nanog.org>
> Subject: Re: will ISP peer with 2 local WAN routers?
>
> The gotcha with that is then you need a switch in front of the routers. I'd
> just setup a carrier on each router and run ibgp between.
>
> Sent from my iPhone
>
> On Aug 16, 2013, at 3:35 PM, "Adam Greene" <maillist at webjogger.net> wrote:
>
>> Hi guys,
>>
>>
>>
>> I have a customer who peers via eBGP with Lightpath aka Cablevision
>> (AS
>> 6128) and Level3 (AS 3356) and wants to do some dual-WAN router
> redundancy.
>>
>>
>> I have heard that carriers will sometimes agree to set up a /29 WAN
>> subnet for a customer and peer with (2) customer routers.
>>
>>
>>
>> The customer is delaying on providing me with the proper circuit ID &
>> contact information to be able to call Lightpath and Level3 directly
>> and find out if they will do this, so I thought of asking this list.
>>
>>
>>
>> Is anyone aware if Lightpath and Level3 will agree to something like this?
>>
>>
>> Thanks,
>>
>> Adam
>>
>>
>>
>>
>>
>




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