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Label Space Reduction in MPLS Networks: How Much Can A Single Stacked Label Do?

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4 Author(s)
Solano, F. ; Broadband & Distrib. Syst. Group, Univ. of Girona, Girona ; Stidsen, T. ; Fabregat, R. ; Marzo, J.L.

Most network operators have considered reducing LSR label spaces (number of labels used) as a way of simplifying management of underlaying virtual private networks (VPNs) and therefore reducing operational expenditure (OPEX). The IETF outlined the label merging feature in MPLS-allowing the configuration of multipoint-to-point connections (MP2P)-as a means of reducing label space in LSRs. We found two main drawbacks in this label space reduction scheme: a) it should be separately applied to a set of LSPs with the same egress LSR-which decreases the options for better reductions, and b) LSRs close to the edge of the network experience a greater label space reduction than those close to the core. The later implies that MP2P connections reduce the number of labels asymmetrically.

Published in:

Networking, IEEE/ACM Transactions on  (Volume:16 ,  Issue: 6 )

Date of Publication:

Dec. 2008

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