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512 IP Header Compression
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The IP header represents a large overhead on voice That overhead can exceed 100 percent Thus, compressing the headers to a minimum is highly desirable MPLS can be used to achieve this A number of well-known header-compression techniques are available In order to use these techniques, you must have a means of uniquely identifying the flow of the packets of a single call If a tunnel carried only one call, the tunnel label could be used for this purpose However, for scalability, it makes sense to use a stack of two labels The outer label represents the tunnel as described previously The inner label is used to identify the compressed flow Behind that label is either a compressed header or, in the case of header suppression, voice data Another concern for voice calls is disruption due to the failure of network elements In IP, when a link or node fails, IP automatically finds a new route However, this takes a bit of time more time than may be tolerated by or acceptable to voice users Again, MPLS offers a solution Trafficengineering tunnels can be locally repaired by sending the packets over a predetermined and preestablished backup tunnel Because the repair is made locally, the time to repair can be well below 50 ms, the standard currently used in the Public Switched Telephone Network (PSTN) There are two divergent views of MPLS as a technology One school sees it as an important enhancement to IP networks, enabling the creation of new services The other sees it as a technology in its own right a
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Five
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frame-based successor to ATM Correspondingly, as noted, there are two approaches to carrying voice in MPLS networks: one approach maps voice directly to MPLS as a service layer and the other maps voice to the IP service layer The IP layer in turn uses MPLS to provide the enhanced IP services outlined previously The IETF has standardized both VoIP and IP over MPLS But what about VoMPLS
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513 The Voice over IP over MPLS (VoIPoMPLS) Proposal
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A proposal for VoMPLS was brought to the IETF in March 2000 It was rejected by the IETF in favor of VoIPoMPLS, which is discussed later in the chapter The VoMPLS proposal has since been taken up by the MPLS Forum (as covered in 6) There were two arguments that carried the IETF s decision First, much of the promise of VoIP is the ubiquity of connectivity offered by IP Telephone networks can be extended across local area networks (LANs) and cable networks Building wiring can be simplified Eliminating IP from the protocol stack limits the connectivity to the edge of the MPLS cloud Thus, VoMPLS is not appropriate for bringing voice to the desktop workstation The second argument concerns efficiency It was argued that a VoMPLS standard was necessary because IP overhead was too expensive But when header compression/suppression is used, the data on the wire look similar to what VoMPLS offers Thus, with VoIPoMPLS, you can have efficiency as well ubiquitous connectivity Some people argue that VoMPLS cannot replace VoIP The ubiquity of connectivity does not exist for MPLS as it does for IP VoIPoMPLS with header suppression could obviate the need for VoMPLS According to suppliers,5 many customers seem interested in the former and few seem interested the latter Indeed, MPLS could be used to eliminate IP from the stack, but the benefits of this are far from obvious, according to some observers MPLS offers benefits to VoIP The efficiency of header compression and the scalability of aggregating flows into simple labels offer economic benefits MPLS QoS and fast restoration offer the means to create a high-quality voice service
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