I-D ACTION:draft-ietf-ospf-2547-dnbit-01.txt
Internet-Drafts@ietf.org Fri, 03 October 2003 20:48 UTC
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Subject: I-D ACTION:draft-ietf-ospf-2547-dnbit-01.txt
Date: Fri, 03 Oct 2003 16:34:54 -0400
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A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Open Shortest Path First IGP Working Group of the IETF. Title : Using an LSA Options Bit to Prevent Looping in BGP/MPLS IP VPNs Author(s) : E. Rosen, et. al. Filename : draft-ietf-ospf-2547-dnbit-01.txt Pages : 6 Date : 2003-10-3 [VPN] describes a method by which a Service Provider (SP) may provide an 'IP VPN' service to its customers. In VPNs of that sort, a Customer Edge (CE) Router and a Provider Edge Router become routing peers, and the customer routes are sent to the SP. BGP is then used to carry the customer routes across the SP's backbone to other PE routers, and the routes are then sent to other CE routers. Since CE routers and PE routers are routing peers, it is customary to run a routing protocol between them. [VPN] allows a number of different PE-CE protocols. If OSPF is used as the PE-CE routing protocol, the PE must execute additional procedures not specified in [VPN]; these procedures are specified in [OSPF-VPN]. These additional procedures translate customer OSPF routes from a CE router into BGP routes. The BGP routes are sent to the other PE routers, which translate them back into OSPF routes, and then distribute them to CE routers. During this translation, some of the information needed to prevent loops may be lost. The procedures specified in this document remedy this situation by specifying that one of the OSPF options bits be used to ensure that when a VPN route is sent from a PE to a CE, the route will be ignored by any PE which receives it back from a CE. A URL for this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-ietf-ospf-2547-dnbit-01.txt To remove yourself from the IETF Announcement list, send a message to ietf-announce-request with the word unsubscribe in the body of the message. Internet-Drafts are also available by anonymous FTP. Login with the username "anonymous" and a password of your e-mail address. After logging in, type "cd internet-drafts" and then "get draft-ietf-ospf-2547-dnbit-01.txt". A list of Internet-Drafts directories can be found in http://www.ietf.org/shadow.html or ftp://ftp.ietf.org/ietf/1shadow-sites.txt Internet-Drafts can also be obtained by e-mail. Send a message to: mailserv@ietf.org. In the body type: "FILE /internet-drafts/draft-ietf-ospf-2547-dnbit-01.txt". NOTE: The mail server at ietf.org can return the document in MIME-encoded form by using the "mpack" utility. To use this feature, insert the command "ENCODING mime" before the "FILE" command. To decode the response(s), you will need "munpack" or a MIME-compliant mail reader. Different MIME-compliant mail readers exhibit different behavior, especially when dealing with "multipart" MIME messages (i.e. documents which have been split up into multiple messages), so check your local documentation on how to manipulate these messages. Below is the data which will enable a MIME compliant mail reader implementation to automatically retrieve the ASCII version of the Internet-Draft.
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