A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Audio/Video Transport Working Group of the IETF.
Title : Protocol Extensions for Header Compression over MPLS
Author(s) : J. Ash, et al.
Filename : draft-ietf-avt-hc-over-mpls-protocol-01.txt
Pages : 19
Date : 2005-9-27
VoIP typically uses the encapsulation voice/RTP/UDP/IP. When MPLS
labels are added, this becomes voice/RTP/UDP/IP/MPLS-labels. For an
MPLS VPN, the packet header is typically 48 bytes, while the voice
payload is often no more than 30 bytes, for example. Header
compression can significantly reduce the overhead through various
compression mechanisms. MPLS is used to route header-compressed (HC)
packets over an MPLS LSP without compression/decompression cycles at
each router. Such an HC over MPLS capability increases the bandwidth
efficiency as well as processing scalability of the maximum number of
simultaneous compressed flows that use HC at each router. MPLS
pseudowires are used to transport the HC context and other control
messages between the ingress and egress MPLS label switched router
(LSR), and the pseudowires define one or more point-to-point
instances corresponding to each HC session at the header
decompressor. Standard HC methods (e.g., ECRTP, ROHC, etc.) are
re-used to determine the context.
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