Inder, The idea behind the STP address swapping is to allow a federating NSA to re-advertise child NSA's as its own resources. This allows a federating NSA to hide the complexity of child Networks and present all resources as part of a single federating Network. Guy From: Inder Monga [mailto:imonga@es.net] Sent: 13 April 2011 14:51 To: Guy Roberts Cc: nsi-wg@ogf.org; 'Jerry Sobieski' Subject: Re: [Nsi-wg] usage of STPs Guy Just for discussion today - URN has been a representation of STPs that has had a lot of support on the mailing list. We should talk about that option as well. The federating NSA and swapping is a new idea - I am not sure that has been discussed before. Please elaborate on what the need for that is? Inder ________________________________ Guy Roberts<mailto:Guy.Roberts@dante.net> April 13, 2011 2:20 AM Hi Jerry, Based on our discussion yesterday I will try and summarize the current thinking on STPs: STP is a tuple which is formed as: Network_Id:Local_id where: Network_id is an string (unformatted - no syntax specified) which identifies a group of resources available to a single service. Each Network has an associated NSA, i.e. there is a 1:1 relationship between and NSA instance and a Network. A single stage lookup is required to find the address of the NSA from the Network_id. Local_id is a string (unformatted - no syntax specified) which identifies a local resource (or endpoint). A federating NSA has the option (not compulsory) of swapping the Network and Local parts of the STP. Both parts must be swapped (not just the network part) this removes the need for Local_id to be globally unique. (this is like MLPS label swapping) Does this align with your view? Guy _____________________________________________________________________ ** Guy Roberts, PhD Network Engineering & Planning * * Tel: +44 (0)1223 371300 * * City House Direct: +44 (0)1223 371316 * 126-130 Hills Road Fax: +44 (0)1223 371371 * Cambridge * CB2 1PQ E-mail: guy.roberts@dante.net<mailto:guy.roberts@dante.org.uk> D A N T E United Kingdom WWW: http://www.dante.net _____________________________________________________________________ _______________________________________________ nsi-wg mailing list nsi-wg@ogf.org<mailto:nsi-wg@ogf.org> http://www.ogf.org/mailman/listinfo/nsi-wg -- Inder Monga 510-486-6531 http://www.es.net Follow us on Twitter: ESnetUpdates/Twitter<http://bit.ly/bisCAd> Visit our blog: ESnetUpdates Blog<http://bit.ly/9lSTO3> Facebook: ESnetUpdates/Facebook<http://bit.ly/d2Olql>