|
Thread Index [isp-bgp] RE: Sample BGP Config
Several factors are involved: 1) BGP fast-external-failover influences how quickly it recomputes in the event of a link failure (at least on Cisco). 2) Underlying static default routes might turn out to be quite helpful; YMMV. 3) Your outbound traffic will learn at a speed that you can monitor. Your inbound traffic will have to learn at the speed of lots of networks. I've found that turning down a BGP peer at least 30 seconds before I conduct maintenance, etc., usually results in nearly seamless transitions for me, again YMMV. Pete Templin Senior Staff Engineer Tex-Link Communications pete.templin@... (210) 892-4183 -----Original Message----- From: cor@..."mailto:cor@...">mailto:cor@...Sent: Wednesday, July 16, 2003 7:32 AM To: isp-bgp@isp-bgp.com Subject: [isp-bgp] RE: Sample BGP Config Hi, I have a rather basic question, If i multihome with two ISP's and one link goes down, will the traffic be routed immediately to the links that is up or does this take little time. ( wait before router down is propagated ) Regards, Cor The rest i assume you know how to configure yourself. /Carl ------- Ursprungligt brev ------- Från: chris@... Datum: Tue, 15 Jul 2003 14:58:48 -0700 Michael, Thanks for the response. The example I read was "Load Sharing when Multihomed to Two ISPs via Multiple Local Routers" The outbound traffic policy in this example limits traffic to one of the two providers unless there is a failure. The outbound traffic policy is as follows: Traffic destined to AS 300 goes via the R1 - ISP(A) link. Traffic destined to AS 400 goes via the R2 - ISP(B) link. All other traffic should prefer default route 0.0.0.0 via the R1 - ISP(A) link. If the R1 - ISP(A) link fails, all traffic should go via the R2 - ISP(B) link. I'd like to have outbound traffic take the shortest path if both ISP's are up and fail over to the other ISP if one ISP link fails. Christopher J. Wolff, VP CIO Broadband Laboratories, Inc. http://www.bblabs.com -----Original Message----- From: Michael Weinstock [mailto:MWeinstock@...Sent: Tuesday, July 15, 2003 2:50 PM To: isp-bgp@isp-bgp.com Subject: [isp-bgp] RE: Sample BGP Config Hello, You didnt like it? Perhaps specify what you didnt like... As the answer will be based on Cisco's docs. -----Original Message----- From: Christopher J. Wolff [mailto:chris@...Sent: Wednesday, 16 July 2003 9:47 a.m. To: isp-bgp@isp-bgp.com Subject: [isp-bgp] Sample BGP Config Hello, I'm looking for a couple of sample cisco configs that illustrate two multihomed routers connected by an IGP session. For example; Router 1----------Isp 1 | | IGP | | Router 2----------Isp 2 I read the Cisco scenarios for multihomed networks documents but I didn't like what I read. Thank you in advance. C.J. Wolff, VP CIO Broadband Laboratories, Inc. http://www.bblabs.com _______________ ______________ _______________ ______________ _______________ ______________ _______________ ______________ _______________ ______________ <- Previous Message | Next Message -> Thread Index |
|
