dc.contributor |
Universitat Politècnica de Catalunya. Departament d'Arquitectura de Computadors |
dc.contributor |
Universitat Politècnica de Catalunya. ANA - Grup d'Arquitectures Avançades de Xarxes |
dc.contributor.author |
Yannuzzi, Marcelo |
dc.contributor.author |
Masip Bruin, Xavier |
dc.contributor.author |
Sánchez López, Sergio |
dc.contributor.author |
Marín Tordera, Eva |
dc.date |
2009-04 |
dc.identifier.citation |
Yannuzzi, M. [et al.]. OBGP+: An improved path-vector protocol for multi-domain optical networks. "Optical switching and networking", Abril 2009, vol. 6, núm. SI:2, p. 111-119. |
dc.identifier.citation |
1573-4277 |
dc.identifier.citation |
10.1016/j.osn.2008.12.001 |
dc.identifier.uri |
http://hdl.handle.net/2117/9655 |
dc.language.iso |
eng |
dc.rights |
Attribution-NonCommercial-NoDerivs 3.0 Spain |
dc.rights |
info:eu-repo/semantics/openAccess |
dc.rights |
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
dc.subject |
Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telecomunicació òptica |
dc.subject |
Optical communications |
dc.subject |
Routers (Computer networks) |
dc.subject |
BGP (Computer network protocol) |
dc.subject |
Ordinadors, Xarxes d' |
dc.subject |
Comunicacions òptiques |
dc.subject |
Protocols de xarxes d'ordinadors |
dc.title |
OBGP+: An improved path-vector protocol for multi-domain optical networks |
dc.type |
info:eu-repo/semantics/publishedVersion |
dc.type |
info:eu-repo/semantics/article |
dc.description.abstract |
One of the essential components for the dynamic provisioning of lightpaths across multiple domains is the Routing and Wavelength Assignment (RWA) strategy adopted. The consolidation that path-vector protocols have had in practice, has motivated the optical extension to BGP (OBGP). We claim, however, that a routing model mostly centered on the exchange of reachability information–like the one we have today with BGP or the one offered by OBGP–will not be sufficient for multi-domain optical networks. Routing domains must be able to exchange both reachability as well as aggregated Path-State Information (PSI). Understanding that this is a missing piece in the routing models provided by BGP and OBGP is easy nowadays, but contributing with solutions capable of highly improving the performance of a path-vector without impacting on key aspects of the protocol–fundamentally, its scalability, its convergence properties, and the number of routing messages exchanged between domains–is a challenging task.
In this paper we propose OBGP +, which is a very simple extension of a path-vector protocol supporting the computation and advertisement of PSI between optical domains. The PSI that we propose to use is highly condensed in the form of a single integer value. In order to avoid the typical increase in the number of routing messages associated with the update of PSI, we propose to piggy-back the updates in non-dummy Keepalive messages exchanged between OBGP+ neighbors. Extensive simulations reveal that, despite its simplicity: (i) OBGP+ is able to drastically reduce the blocking experienced with a path-vector protocol like OBGP; (ii) OBGP+ needs much less number of routing messages than OBGP to achieve such performance; and (iii) the convergence and restoration features of OBGP+ are also better than those of OBGP, which is particularly important for connections that lack a protection path. |