IP over Ethernet over 802.16

[draft-ietf-16ng-ip-over-ethernet-over-802.16-05.txt]

IETF-71, Philadelphia, March ‘08Max Riegel (NSN), Hongseok Jeon (ETRI), Sangjin Jung (ETRI)

We apologize…

• Unfortunately we missed the submission deadline of our latest revision ‘draft-ietf-16ng-ip-over-ethernet-over-802.16-05.txt’ for the IETF-71 by a couple of hours.

• Nevertheless this presentation refers to the latest revision, which should be in the IETF archives after the meeting.

• For the time being:http://ipv6.or.kr/draft-ietf-16ng-ip-over-ethernet-over-802.16-05.txt

[draft-ietf-16ng-ip-over-ethernet-over-802.16-04.txt]

• -04 version was submitted directly after IETF-70• Main issue: clarification of MTU issue when

using VLANs for tunneling between BS and Net-Bridge– Due to stacked VLAN tags, packet size may exceed

capabilities of Ethernet link between BS and Net-Bridge

– Most of the Carrier Ethernet equipment can handle larger packets

– Operator has to be aware of this particularity

• GRE-base tunneling does not have this issue

Review by IEEE802.16From: ext Roger B. Marks [mailto:r.b.marks@ieee.org] Sent: Sunday, January 27, 2008 1:16 PMSubject: [16NG] IEEE 802.16 WG consideration of ip-over-ethernet-over-802.16internet draft

Dear Daniel and Gabriel,

Please consider the following statement of the IEEE 802.16 Working Group:

<http://ieee802.org/16/liaison/docs/L80216-08_002r1.pdf>

As always, we appreciate the opportunity to review your drafts.

Regards,

Roger B. MarksChair, IEEE 802.16 Working Group on Broadband Wireless Access

IEEE802.16 review commentsDuring its Session #53 in Levi, Finland of 21 -24 January, the IEEE 802.16 Working Group (WG), through an ah hoc review committee, developed the following comments on the IETF 16ng document draft-ietf-16ng-ip-over-ethernet-over-802.16-04.Convergence Sublayer TypesSection 4.2 discusses the different convergence sublayer types. During the development of the IP over Ethernet over 802.16 specification, the GPCS (Generic Packet Convergence Sublayer) has been standardized in IEEE 802.16 with the approval of the IEEE Std 802.16g-2007 amendment on 27 September 2007. This convergence sublayer supports Ethernet packet types. It appears that nowhere does the draft mention that it is either the 802.3/Ethernet specific part of the packet CS (Ethernet CS) or the GPCS over which the Ethernet frames are being carried. It would be appropriate to state this.GPCSUsing the GPCS, the classification and Packet Header Suppression (PHS) of higher layer packets to particular service flows is performed outside the 802.16 convergence sublayer and is indicated to the convergence sublayer through the use of a service flow ID and subscriber station MAC address that the 802.16 convergence sublayer uses to identify a related CID.Multicast CIDsThe second paragraph of Appendix A implies that a standardized means of establishing and maintaining multicast CIDs is needed. IEEE Std 802.16 already provides this. It is the association with Layer 3 traffic that is not defined in the 802.16 standard.MBSIn the second paragraph of Appendix A, The term ‘multicast and broadcast’ can be easily confused with MBS (multicast broadcast service). It would be appropriate to clarify the difference.Ongoing WorkIn the second paragraph of Appendix A, we suggest that the forward looking statement "Such a protocol is not yet available but under development by the Networking Working Group of the WiMAX Forum." is not appropriate for a standards RFC.

[draft-ietf-16ng-ip-over-ethernet-over-802.16-05.txt]

1. Updated "Introduction" on CS (Convergence Sublayer) for IP over Ethernet transportA new paragraph has been added to the "Introduction" so that it introduces which CS can be used for transport of IP over Ethernet packets.

2. Updated "Section 4.2" on CS for IP over Ethernet transportSection 4.2 has been updated to state packet CSs over which Ethernet frames are being carried.Section 4.2 describes "Ethernet CS" and "GPCS" for IP over Ethernet packet transmission, and refers to IEEE 802.16g for "GPCS".

3. Clarified "Appendix A"The first paragraph was removed from Appendix A for clarification. The term 'multicast and broadcast' has been edited to 'multicast or broadcast' to differentiate the term with MBS.The sentences related to standardization on Multicast CIDs and ongoing works in WiMAX in the second paragraph were edited out because it is confusing and inappropriate.

4. I-D nits checking & editorial clarificationSpecial thanks to D.J. Johnston

Step forward

• I-D got meanwhile a lot of reviews– Very stable basic concept– A lot of text tweaking out of the reviews

Conclusion:

• I-D is ready for IESG review