Presentation is loading. Please wait.

Presentation is loading. Please wait.

May 2004 doc.: IEEE /629r1 May 2004 The Nature of an ESS

Published byKajetan Pietrzak Modified over 5 years ago

Similar presentations

Presentation on theme: "May 2004 doc.: IEEE /629r1 May 2004 The Nature of an ESS"— Presentation transcript:

1 May 2004 doc.: IEEE /629r1 May 2004 The Nature of an ESS Darwin Engwer, Nortel Networks Bob O’Hara, Airespace Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace

2 Further thoughts on ESS (triggered by submission 11-04-0614-00)
May 2004 Further thoughts on ESS (triggered by submission ) Doc 614 [1] cites a number quotes directly from the standard wrt the definition of an ESS. Strictly interpreted these existing definitions constrain the implementation options as cited in doc 614 However, other logical (abstract) views are possible, which have in fact allowed vendors to construct functional WLANs within the constraints imposed by existing definitions. First, a diagram from doc Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace

3 AP + DS + Portal Portal Distribution System
May 2004 Slide 6 from [1] doc AP + DS + Portal HOST Router 802.3 network Portal Distribution System AP AP AP STA Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace

4 But real world implementations (to date) look like this ...
May 2004 But real world implementations (to date) look like this ... Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace

5 Real World AP Devices May 2004 AP Device AP Device HOST Router
802.3 network 802.3 L2 Hub or Switch WM Portal Integration Distribution System AP Device WM Portal Integration Distribution System AP Device STA STA STA Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace

6 May 2004 doc.: IEEE /629r1 May 2004 Real World AP Review In that common real world AP and WLAN implementation, the mini-DSs and portals in each AP combined with the L2 network can be considered as forming a single logical Distribution System and Portal, since those logical components meet all the criteria described in Clause 5. “5.2.2 … The IEEE LAN architecture is specified independently of the physical characteristics of any specific implementation.” … The DS enables mobile device support by providing the logical services necessary to handle address to destination mapping and seamless integration of multiple BSSs.” Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace

7 Logical DS and Portal Distribution System Portal May 2004 AP Device
HOST Router 802.3 network 802.3 L2 Hub or Switch Portal Distribution System WM Portal Integration Distribution System AP Device WM Portal Integration Distribution System AP Device A single logical portal is indistinguishable from multiple physical portals. STA STA STA Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace

8 May 2004 Logical DS and Portal There is no disagreement between the Logical DS and Portal model and the formal definitions provided in Clause 5. Consider: “ The key concept is that the ESS network appears the same to an LLC layer as an IBSS network. Stations within an ESS may communicate and mobile stations may move from one BSS to another (within the same ESS) transparently to LLC.” Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace

9 L2 Connectivity with a Logical DS and Portal
May 2004 L2 Connectivity with a Logical DS and Portal HOST Router 802.3 network 802.3 L2 Hub or Switch Portal Distribution System WM Portal Integration Distribution System AP Device WM Portal Integration Distribution System AP Device STA STA STA L2 link L2 link Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace

10 May 2004 Extent of the ESS Hence, the ESS can span all the APs in such a network. Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace

11 ESS with a Logical DS and Portal
May 2004 ESS with a Logical DS and Portal HOST Router 802.3 network 802.3 L2 Hub or Switch Portal Distribution System WM Portal Integration Distribution System AP Device WM Portal Integration Distribution System AP Device STA STA STA ESS L2 link ESS L2 link Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace

12 What if the network includes a router?
May 2004 What if the network includes a router? Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace

13 L2 Connectivity with a Logical DS and Portal using a Router
May 2004 L2 Connectivity with a Logical DS and Portal using a Router HOST Router 802.3 network Distribution System 802.3 L2 Hub or Switch Portal 802.3 L2 Hub or Switch Portal WM Portal Integration Distribution System AP Device WM Portal Integration Distribution System AP Device STA STA STA L2 link L2 link Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace

14 L2 Connectivity thru a Distribution System that includes a Router
May 2004 doc.: IEEE /629r1 May 2004 L2 Connectivity thru a Distribution System that includes a Router At first look it appears as if the two STAs on opposite sides of the router do not have L2 Connectivity. However, the DS (or some other component in the network) can arrange this to be true. e.g. the mini-DS in one AP can transport the MSDU to the mini-DS in the AP that is on the other side of the router. The second AP can then deliver the MSDU to the mobile STA. To the mobile STAs it appears as if they have L2 connectivity. e.g. A consistent VLAN can be set up on both sides of the router, so that packets on that VLAN are switched across the router. In fact, this is a common deployment scenario today. Again, to the mobile STAs it appears as if they have L2 connectivity. Clause : “The key concept is that the ESS network appears the same to an LLC layer as an IBSS network. Stations within an ESS may communicate and mobile stations may move from one BSS to another (within the same ESS) transparently to LLC.” Note that the cited clause refers to “transparently to LLC”. That is the criteria, NOT IP connectivity between the two STAs. IP connectivity between the two STAs may be compromised at times because the IP stack (knowing the two IP addresses to be on different subnets) will re-address the packets at layer 2 (to instead send the packet to the gateway). This has no bearing on whether another network application, using the MAC-SAP interface can send messages (tuples) from one STA to another. Clause and define the MAC data service. The MA-UNITDATA.request primitive parameters [the tuple] are (SA, DA, data, …). The data parameter is the actual MSDU, although we often use the shorthand notation of MSDU to refer to the entire tuple (t). Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace

15 ESS with a Logical DS and Portal using a Router
May 2004 ESS with a Logical DS and Portal using a Router Hence, the ESS concept can apply to WLAN deployments that rely on a logical DS/ logical portal(s) construct, even when using a router. Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace

16 ESS with a Logical DS and Portal using a Router
May 2004 ESS with a Logical DS and Portal using a Router HOST Router 802.3 network Distribution System 802.3 L2 Hub or Switch Portal 802.3 L2 Hub or Switch Portal WM Portal Integration Distribution System AP Device WM Portal Integration Distribution System AP Device STA STA STA ESS L2 link ESS L2 link Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace

17 ESS Summary BSSs with the same SSID may be part of the same ESS.
No scenarios are [necessarily] excluded. The definition of an ESS is somewhat broad and flexible. Therefore, TGr may need to specify and explicitly define the BSS-transition cases that are in-scope and out-of-scope. i.e. If TGr wants something more precise than ESS, then need to specify that. Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace

18 References: [1] 11-04-0614-00-frfh-what-ess.ppt
May 2004 References: [1] frfh-what-ess.ppt [2] mes-need-clarification-definition-ess-mesh.ppt Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace

19 The End May 2004 doc.: IEEE 802.11-04/629r1 May 2004
Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace Darwin Engwer, Nortel Networks; Bob O'Hara, Airespace

Download ppt "May 2004 doc.: IEEE /629r1 May 2004 The Nature of an ESS"

Similar presentations

Doc.: IEEE 802.11-04/1191r5 Submission November 2004 Mike Moreton, STMicroelectronicsSlide 1 AP Architecture Thoughts Mike Moreton, STMicroelectronics.

Doc.: IEEE /1191r5 Submission November 2004 Mike Moreton, STMicroelectronicsSlide 1 AP Architecture Thoughts Mike Moreton, STMicroelectronics.
Doc.: IEEE 802.11-04-614-01-frfh Submission July 2004 Jon Edney, NokiaSlide 1 What is an ESS? Jon Edney, Nokia.

Doc.: IEEE frfh Submission July 2004 Jon Edney, NokiaSlide 1 What is an ESS? Jon Edney, Nokia.
Doc.: IEEE 802.11-04/604r0 Submission May 2004 Darwin Engwer, Nortel Networks; Lily Yang, Intel Corp.Slide 1 AP Functional Descriptions Update Darwin Engwer,

Doc.: IEEE /604r0 Submission May 2004 Darwin Engwer, Nortel Networks; Lily Yang, Intel Corp.Slide 1 AP Functional Descriptions Update Darwin Engwer,
Doc.: IEEE 802.11-04/1191r4 Submission November 2004 Mike Moreton, STMicroelectronicsSlide 1 AP Architecture Thoughts Mike Moreton, STMicroelectronics.

Doc.: IEEE /1191r4 Submission November 2004 Mike Moreton, STMicroelectronicsSlide 1 AP Architecture Thoughts Mike Moreton, STMicroelectronics.
CCNA Exploration Semester 3 Modified by Profs. Ward and Cappellino

CCNA Exploration Semester 3 Modified by Profs. Ward and Cappellino
Overview of simple LANs. Networking basics: LAN TCP/IP is the protocol used in the Internet and dominates the internet and transport layers The subnet.

Overview of simple LANs. Networking basics: LAN TCP/IP is the protocol used in the Internet and dominates the internet and transport layers The subnet.
IEEE Wireless LAN Standard

IEEE Wireless LAN Standard
1 Review of Important Networking Concepts Introductory material. This slide uses the example from the previous module to review important networking concepts:

1 Review of Important Networking Concepts Introductory material. This slide uses the example from the previous module to review important networking concepts:
Doc.: IEEE 802.11-07/2233r0 Submission July 2007 Darwin Engwer, Nortel NetworksSlide 1 Wireless Bridge Common Practices Notice: This document has been.

Doc.: IEEE /2233r0 Submission July 2007 Darwin Engwer, Nortel NetworksSlide 1 Wireless Bridge Common Practices Notice: This document has been.
Doc.: IEEE 11-14/0562r4 November 2014 SubmissionSlide 1Norman Finn, Cisco Systems, Mark Hamilton, Spectralink 802.11ak and 802.1AC Convergence Function.

Doc.: IEEE 11-14/0562r4 November 2014 SubmissionSlide 1Norman Finn, Cisco Systems, Mark Hamilton, Spectralink ak and 802.1AC Convergence Function.
CECS 5460 – Assignment 3 Stacey VanderHeiden Güney.

CECS 5460 – Assignment 3 Stacey VanderHeiden Güney.
Submission doc.: IEEE 11-13/0406-00-02ak May 2013 Norman Finn, Cisco SystemsSlide 1 P802.1Qbz + P802.11ak Proposed Division of Work Date: 2013-05-06 Authors:

Submission doc.: IEEE 11-13/ ak May 2013 Norman Finn, Cisco SystemsSlide 1 P802.1Qbz + P802.11ak Proposed Division of Work Date: Authors:
Doc.: IEEE 802.11-04/0981r1 TGs Reference Architecture Considerations September 6, 2004 Tricci So & W. Steven Conner.Slide 1 TGs ESS Mesh System Reference.

Doc.: IEEE /0981r1 TGs Reference Architecture Considerations September 6, 2004 Tricci So & W. Steven Conner.Slide 1 TGs ESS Mesh System Reference.
Submission doc.: IEEE 11-12/0589r2 July 2012 Donald Eastlake 3rd, Huawei R&D USASlide 1 General 802.11 Links Date: 2012-05-08 Authors:

Submission doc.: IEEE 11-12/0589r2 July 2012 Donald Eastlake 3rd, Huawei R&D USASlide 1 General Links Date: Authors:
Doc.: 11-04-0500-00-0mes Submission 7 May 2004 Tricci SoSlide 1 Need Clarification on The Definition of ESS Mesh Prepared by Tricci So.

Doc.: mes Submission 7 May 2004 Tricci SoSlide 1 Need Clarification on The Definition of ESS Mesh Prepared by Tricci So.
Doc.: IEEE 802.11-05/0850r4 Submission September, 2005 Yao Zhonghui, Huawei Slide 1 802.11u Proposal Notice: This document has been prepared to assist.

Doc.: IEEE /0850r4 Submission September, 2005 Yao Zhonghui, Huawei Slide u Proposal Notice: This document has been prepared to assist.
Doc.: IEEE 802.11-04/0351r0 Submission March 2004 Haixiang He, Darwin Engwer, Nortel NetworksSlide 1 Fast Roaming Study Group: Proposal for Task Group.

Doc.: IEEE /0351r0 Submission March 2004 Haixiang He, Darwin Engwer, Nortel NetworksSlide 1 Fast Roaming Study Group: Proposal for Task Group.
Submission doc.: IEEE 11-13/0406-04-00ak May 2013 Finn and Hart, Cisco SystemsSlide 1 P802.1Qbz + P802.11ak Proposed Division of Work Date: 2013-05-09.

Submission doc.: IEEE 11-13/ ak May 2013 Finn and Hart, Cisco SystemsSlide 1 P802.1Qbz + P802.11ak Proposed Division of Work Date:
Doc.: IEEE 802.11-04/0981r0 TGs Reference Architecture Considerations August 30, 2004 Tricci So.Slide 1 TGs ESS Mesh System Reference Architecture Considerations.

Doc.: IEEE /0981r0 TGs Reference Architecture Considerations August 30, 2004 Tricci So.Slide 1 TGs ESS Mesh System Reference Architecture Considerations.
Doc.: IEEE 802.11-08/1378r0 Submission November 2008 Darwin Engwer, Nortel NetworksSlide 1 Improving Multicast Reliability Date: 2008-11-11 Authors:

Doc.: IEEE /1378r0 Submission November 2008 Darwin Engwer, Nortel NetworksSlide 1 Improving Multicast Reliability Date: Authors:

Similar presentations

Ads by Google