Leigh, One little trick that I used to use, was to have both providers advertise my complete address space, and then turn around and have Provider A address a sub-range where my most traffic intense servers were located. Under the principle of most specific route, it directed most of my traffic to A.
It wasn't fool proof, but it worked pretty well. David A. Greer Network Services General Nutrition, Inc This e-mail, and any attachments, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. It is the property of General Nutrition Centers. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution or copying of this e-mail, any attachments thereto, and use of the information contained, is strictly prohibited. If you have received this e-mail in error, please notify the sender and permanently delete the original and any copy thereof. -----Original Message----- From: Leigh Sharpe [mailto:[email protected]] Sent: Thursday, May 14, 2009 7:38 PM To: Enterasys Customer Mailing List Subject: RE: [enterasys] BGP upstream route selection Thanks Dave, You have assumed correctly. It's the usual story. Provider A is all-you-can-eat, but provider B is pay-per-MB. I want to have all traffic delivered to us via provider A, most of the time, but I also want to be able to nominate which prefixes should be delivered to us via provider B, as and when I chose. Looks like you'lll be getting a call... -----Original Message----- From: Holbrook, Dave [mailto:[email protected]] Sent: Friday, 15 May 2009 9:17 AM To: Enterasys Customer Mailing List Cc: Enterasys Customer Mailing List Subject: Re: [enterasys] BGP upstream route selection An interesting question. If I assume you mean you wish to influence inbound traffic then your options are very limited as the provider usually has no obligation to honor any metrics you attempt to set. If I assume you are trying to influence your outbound routing options then you would want to create several import policies to give varying preferences to the routes you choose to receive. If you need assistance, call into support. Have a great day! David On May 14, 2009, at 3:49 PM, "Leigh Sharpe" <[email protected]<mailto:[email protected]>> wrote: Hi All, I have an old SSR8000 doing BGP into several upstream peers. I am about to add another peer, but I want to be able to influence the upstream route selection so that the new peer is only used as a last resort (ie, when all other gateways are unavailable). I also want to be able to change this on a per-advert basis, ie have some prefixes delivered by this peer always, but only as a last resort for other prefixes. Can anybody suggest how to influence upstream routes? AS-path prepending doesn't sound like it's flexible enough. What other metrics are available to me? Thanks in advance, Leigh * --To unsubscribe from enterasys, send email to <mailto:[email protected]> [email protected]<mailto:[email protected]> with the body: unsubscribe enterasys [email protected]<mailto:[email protected]> --- To unsubscribe from enterasys, send email to [email protected] with the body: unsubscribe enterasys [email protected] --- To unsubscribe from enterasys, send email to [email protected] with the body: unsubscribe enterasys [email protected] --- To unsubscribe from enterasys, send email to [email protected] with the body: unsubscribe enterasys [email protected]
