nanog mailing list archives
Re: will ISP peer with 2 local WAN routers?
From: Eugeniu Patrascu <eugen () imacandi net>
Date: Tue, 20 Aug 2013 12:43:27 +0300
A bit late to the discussion, but we use a stack of EX switches which terminate L2 connections from the providers and two routers which have BGP sessions with them. Each switch has ports provisioned so that in case one switch fails, we just simply move the ethernet cable to the working switch and everything is fine. Eugeniu On Sat, Aug 17, 2013 at 12:47 AM, Adam Greene <maillist () webjogger net>wrote:
Pete, Good point, thanks. Yes, in this case, there is some cause to believe that the switches will prove more reliable than the routers. They're older 7200VXR's and have had some lockups in the past, possibly due to PA card / IOS incompatibilities. But you're right, we are also considering accepting full or partial routes from both providers, one provider per router, and then doing iBGP between them to balance the load. We're thinking of deploying default routes and HSRP to stacked 3750's for round-robin load balancing on the LAN side. Thanks for the help! Adam -----Original Message----- From: Peter Kristolaitis [mailto:alter3d () alter3d ca] Sent: Friday, August 16, 2013 5:30 PM To: nanog () nanog org Subject: Re: will ISP peer with 2 local WAN routers? 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 noproblem.-----Original Message----- From: Justin Vocke [mailto:justin.vocke () gmail com] Sent: Friday, August 16, 2013 4:47 PM To: Adam Greene Cc: <nanog () 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 () 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 routerredundancy.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 likethis?Thanks, Adam
Current thread:
- will ISP peer with 2 local WAN routers? Adam Greene (Aug 16)
- Re: will ISP peer with 2 local WAN routers? Justin Vocke (Aug 16)
- Re: will ISP peer with 2 local WAN routers? Randy Carpenter (Aug 16)
- RE: will ISP peer with 2 local WAN routers? Adam Greene (Aug 16)
- Re: will ISP peer with 2 local WAN routers? Peter Kristolaitis (Aug 16)
- RE: will ISP peer with 2 local WAN routers? Adam Greene (Aug 16)
- Re: will ISP peer with 2 local WAN routers? Eugeniu Patrascu (Aug 20)
- Re: will ISP peer with 2 local WAN routers? Justin Vocke (Aug 16)
- Re: will ISP peer with 2 local WAN routers? Mark Gauvin (Aug 29)