-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On 08/31/2012 09:21 AM, bill.ing...@t-systems.com wrote: > I think having a GRE tunnel for the internal routing protocol is > unnecessary. Can you explain the reasoning behind this? I > understand the technical issue whereby GRE will allow multicast for > EIGRP, OSPF, etc, but why not just redistribute into BGP? > > I work on a lot of MPLS CE routers, and in general you can > accomplish anything you need by redistributing your internal > routing protocol into BGP, and adjusting LP, MED and AS Prepend as > needed. > > Thanks, > > Bill - ----------------------- Using bgp communities (MED attribute "inbound") helped influence our path(s) between our mpls providers.
regards, /virendra > > -----Original Message----- From: Lee [mailto:ler...@gmail.com] > Sent: Friday, August 31, 2012 11:15 AM To: Tribble, Wesley Cc: > nanog@nanog.org Subject: Re: Redundant Routes, BGP with MPLS > provider > > On 8/30/12, Tribble, Wesley <wtrib...@sterneagee.com> wrote: >> Hello all, >> >> I am an Network Operator working in an Enterprise environment >> with offices all over the country(mostly connected via MPLS). We >> are currently working towards building a Disaster Recovery Site >> that will host some of our vendor routers and provide the >> capability to access these vendors from both our primary and >> backup data center locations. > >> The routes(as advertised by the vendor's routers) will be the >> same at both locations. I would like to advertise the routes >> from multiple locations at the same time, rather than suppress >> the routes and > advertise conditionally. > > At work, we have our internal routing protocol running on GRE over > IPSec tunnels & keep the BGP sessions with the MPLS provider > limited to just the MPLS network. And have an ACL on the MPLS > network interface that allows only what's expected in... some > providers are better than others at not having anything hit the > 'deny any any log' line > > Regards, Lee > > >> >> What is the best method to Instruct the provider's network to >> prefer the Primary Data Center routes over the DR site? Keep in >> mind that I am only peering with the provider over BGP and I have >> no visibility to > >> the underlying MPLS architecture or configuration. Although if >> you have specific questions about their architecture, I can work >> to get > answers. >> >> Discussing in house, we have gone over a few different options: >> >> -Advertise specific routes from primary site and summary routes >> from the DR site. Most specific will always be chosen. -Prepend >> the routes from the DR site so that they will have a longer >> AS-path than the Primary location -Use Community Strings to >> influence local preference.(Still working to find out if Provider >> will pass our community strings) >> >> Just looking for some ideas and best practices. Any thoughts or >> insight would be much welcomed and appreciated. This is my >> first message on NANOG, so please be gentle. I apologize in >> advance if I have done something incorrectly. >> >> >> Wes >> >> >> ________________________________ >> ********************************************************************** >> >> **************************** Sterne Agee Group, Inc. and its >> subsidiaries request that you do not transmit orders and >> instructions regarding your Sterne Agee account by e-mail. >> Transactional details do > >> not supersede normal trade confirmations or statements. The >> information contained in this transmission is privileged and >> confidential. It is intended for the use of the individual or >> entity named above. The information contained herein is based on >> sources we believe reliable but is not considered all-inclusive. >> Opinions are our > >> current opinions only and are subject to change without notice. >> Offerings are subject to prior sale and/or change in price. >> Prices, quotes, rates and yields are subject to change without >> notice. Sterne Agee & Leach, Inc. member FINRA and SIPC, is a >> registered broker-dealer subsidiary of Sterne Agee Group, Inc. >> Generally, investments are NOT FDIC INSURED, NOT BANK GUARANTEED, >> and MAY LOSE VALUE. Please contact your Financial Advisor with >> information regarding specific investments. Sterne Agee reserves >> the right to monitor all electronic correspondence. >> > ************************************************************************ > > ************************** >> > > > -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://www.enigmail.net/ iF4EAREIAAYFAlBBA1kACgkQ3HuimOHfh+HhsgD7BGtBuiX9tw0leW5e2Jv3jT5E OvAlvkc6bJgE6oSPwdYA/2AkjAWawOOJAIvkmIh6+jXQJo5IRJhl5u6IqtbwFKsy =zUYy -----END PGP SIGNATURE-----
