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Lou Berger LabN Consulting, LLC Jason Jeffords Integral Access Inc. March, 2000

MPLS/IP Header Compression (draft-berger-mpls-hdr-comp-00.txt) MPLS/IP Header Compression over PPP (draft-berger-mpls-hdr-comp-over-ppp-00.txt). Lou Berger LabN Consulting, LLC Jason Jeffords Integral Access Inc. March, 2000. MPLS/IP Header Compression. Being worked on in MPLS working group

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Lou Berger LabN Consulting, LLC Jason Jeffords Integral Access Inc. March, 2000

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  1. MPLS/IP Header Compression(draft-berger-mpls-hdr-comp-00.txt)MPLS/IP Header Compression over PPP(draft-berger-mpls-hdr-comp-over-ppp-00.txt) Lou Berger LabN Consulting, LLC Jason Jeffords Integral Access Inc. March, 2000

  2. MPLS/IP Header Compression • Being worked on in MPLS working group Goals: • Enable header compression for MPLS encapsulated traffic • Optimize for maximum compression • End-to-end (LSP ingress to egress) compression not a requirement • Targeted at “lower speed” links • Definition of “lower speed” is hardware specific

  3. Option Considerations Uncompressed Option:MPLS Stack Not Compressed Option:MPLS Stack Compressed Link Link Link MPLS 1-n MPLS 1-n Comp. Hdr IP Comp. Hdr data TCP or UDP data [RTP] data • Different options considered to meet objectives • Key consideration: • Are MPLS headers compressed

  4. Options LSR A Ingress LSR B LSR C Egress End-to-End Link-by-Link • End-to-end • With header compression over MPLS • Link-by-link • With compression of MPLS/IP headers

  5. Pros Transparently traverses non-compressing LSRs Uses less node resources Can operate at higher rates Link layer independent Cons Not very byte efficient (52% savings) No MPLS Header compression “Simple” Header Compression draft-swallow-mpls-simple-hdr-compress-00.txt Pros Very efficient (>90-95% savings) Compressed header fixed No increase with more MPLS labels Cons Requires link layer support Node resource requirements limit operation to lower data rates ==> MPLS/IP Header Compression Objective: Optimize for maximum compression Options (continued) Link Link MPLS 1-n Comp. Hdr Comp. Hdr data data End-to-End with Header compression over MPLS Link-by-Link withCompression of MPLS/IP headers

  6. Comparison of Compression Approaches (*1) 1 MPLS Header/IP/UDP/RTP - no RTP CSRC, no UDP checksum (*2) 1 MPLS Header/IP/UDP/RTP - no RTP CSRC Full Header = 44 bytes

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