XCAST team report Yuji IMAI (WIDE Project) 1.RFC5058 issued on Nov 2007. “Explicit Multicast...
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Transcript of XCAST team report Yuji IMAI (WIDE Project) 1.RFC5058 issued on Nov 2007. “Explicit Multicast...
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XCAST team reportYuji IMAI (WIDE Project)
1. RFC5058 issued on Nov 2007.• “Explicit Multicast (Xcast) Concepts and Opti
ons” issued.”• What we’ve achieve, at last?
2. Next step• XCAST as a building block of SAM• XCAST 2.0
IRTF SAM RG@71st IETF
IRTF SAM RG@71st IETF
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RFC5058What we’ve achieved, at last?
• Not achieved– Good usage, applications– Industrial products & services– Broad deployment
• Achievement– During discussion in SAM-RG
• There are requirements, XCAST will not solve solely.
– Get rough consensus discussing w/ RFC-editors & IESG• This is excellent and potentially very useful work. However, I would l
ike to discuss how to move forward with regards to the proposed allocation of ... [ID-tracker, June 2007]
• Design became old style for modern hardware routers. [RFC-editorial board]
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XCAST as a building block of SAMPros. & Cons.
• XCAST isn’t good– No built-in signaling– No bridging for other
mcast variations, yet.– No traffic adaptation m
echanism
• XCAST is good– Keeping very huge
number of group– Transmitter can select
arbitrary sub-set of the group members of individual datagram
– providing basic communication mechanisms necessary to realize ALM, OLM.
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OS (Windows / Mac / Linux / FreeBSD.. )
SAM Applications
XCAST
SAMTK Group Web Server(Apache / PHP)
SAMTK Core Module
XCAST in SAMTK Architecture
Protocol Interface
Group InterfaceGroup Management
Module
Application Interface
HTTP/XML
Hybrid OverlayPlugin
XCAST Plugin ALM
Plugin
Native mcast UnicastAMT
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XCAST 2.0<draft-ug-xcast20-protocol-spec-00.txt >
• XCAST6 (version 2.0) Protocol Specification, Feb 2008
– Submitted after RFC5058 issued– Modified points
i. Move semi-permeable tunnel info from Hop-by-hop option to DSCP field of IPv6– Option header becomes performance neck w/ modern
hardware routes.
ii. Fixed length list of destinationiii. Describe to clarify the detailed info for interoperation more
than RFC5058.
– Requirement for additional functions to support Hybrid Overlay framework is welcome!
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XCAST 2.0Implementation
• Operate system first, not spec first!!
• Firstly, with OSS– FreeBSD 6.X, Linux 2.6.XX– XCAST fan club will change the base from
XCAST6-1.0 to 2.0, soon.
• XCAST 2.0 code will release integrated with SAM-TK
“Code then spec not Spec then Code”
Motto of Itojun