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Encoding 3 PCN-States in the IP header using a single DSCP draft-ietf-pcn-3-in-1-encoding-04.txt

Encoding 3 PCN-States in the IP header using a single DSCP draft-ietf-pcn-3-in-1-encoding-04.txt. Bob Briscoe , BT Toby Moncaster, independent Michael Menth, Uni Tuebingen IETF-80 PCN Mar 2011. status. Encoding 3 PCN-States in the IP header using a single DSCP

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Encoding 3 PCN-States in the IP header using a single DSCP draft-ietf-pcn-3-in-1-encoding-04.txt

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  1. Encoding 3 PCN-States in the IP header using a single DSCPdraft-ietf-pcn-3-in-1-encoding-04.txt Bob Briscoe, BTToby Moncaster, independentMichael Menth, Uni Tuebingen IETF-80 PCN Mar 2011

  2. status • Encoding 3 PCN-States in the IP header using a single DSCP • mature draft: draft-ietf-pcn-3-in-1-encoding-04.txt • dependency: RFC6040 (now Proposed Standard) • intended status: experimental → standards track • exec summary: very simple but complete draft • immediate intent: WGLC over, but some spare text needs a home Consider implications of “updates 5696”

  3. additional section: support for e2e ECN • 4 approaches in baseline encoding app’x are imprecise: • tunnel across PCN domain • encode e2e ECN into an extended PCN encoding • signal lack of ECN support to source (e.g. by drop) • remark ECN-capable packets to a non-PCN-capable DSCP • now clearer what to recommend • lay out all the possible cases • esp. document precisely how PCN uses a tunnel to protect e2e ECN • flag when updates or deprecates each of the above 4 approaches • main point: e2e ECN safe if PCN placed logically within tunnel • any tunnel endpoint within 3-in-1 PCN domain must satisfy RFC6040 PCN ingress: NM PCN egress: Not-PCN* RFC 6040 RFC 6040 PCN PCN any-tunnel-rfc any-tunnel-rfc tunnel ingress tunnel egress * experimentally, could leave PCN unchanged to trigger codec adaptation

  4. Encoding 3 PCN-States in the IP header using a single DSCPdraft-ietf-pcn-3-in-1-encoding-04.txt Q&A

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