On optimal computation of MPLS label binding for multipoint-to-point connections


Autoria(s): Solano Donado, Fernando; Fabregat Gesa, Ramon; Marzo i Lázaro, Josep Lluís
Data(s)

2008

Resumo

Most network operators have considered reducing Label Switched Routers (LSR) label spaces (i.e. the number of labels that can be used) as a means of simplifying management of underlaying Virtual Private Networks (VPNs) and, hence, reducing operational expenditure (OPEX). This letter discusses the problem of reducing the label spaces in Multiprotocol Label Switched (MPLS) networks using label merging - better known as MultiPoint-to-Point (MP2P) connections. Because of its origins in IP, MP2P connections have been considered to have tree- shapes with Label Switched Paths (LSP) as branches. Due to this fact, previous works by many authors affirm that the problem of minimizing the label space using MP2P in MPLS - the Merging Problem - cannot be solved optimally with a polynomial algorithm (NP-complete), since it involves a hard- decision problem. However, in this letter, the Merging Problem is analyzed, from the perspective of MPLS, and it is deduced that tree-shapes in MP2P connections are irrelevant. By overriding this tree-shape consideration, it is possible to perform label merging in polynomial time. Based on how MPLS signaling works, this letter proposes an algorithm to compute the minimum number of labels using label merging: the Full Label Merging algorithm. As conclusion, we reclassify the Merging Problem as Polynomial-solvable, instead of NP-complete. In addition, simulation experiments confirm that without the tree-branch selection problem, more labels can be reduced

Formato

application/pdf

Identificador

Solano, F., Fabregat, R., i Marzo, J.L. (2008). On optimal computation of MPLS label binding for multipoint-to-point connections. IEEE Transactions on Communications, 56, 7, 1056-1059. Recuperat 19 maig 2010, a http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4568446

0090-6778

http://hdl.handle.net/10256/2327

http://dx.doi.org/10.1109/TCOMM.2008.050601

Idioma(s)

eng

Publicador

IEEE

Relação

Reproducció digital del document publicat a: http://dx.doi.org/10.1109/TCOMM.2008.050601

© IEEE Transactions on Communications, 2008, vol. 56, p. 1056-1059

Articles publicats (D-ATC)

Direitos

Tots els drets reservats

Palavras-Chave #Arbres (Teoria de grafs) #MPLS (Norma) #Protocols de xarxes d'ordinadors #Computer network protocols #MPLS standard #Trees (Graph theory) #Virtual Private Network
Tipo

info:eu-repo/semantics/article