Considerations on WDS Addressing Tricci So 7 May 2004 Prepared by

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Presentation transcript:

Considerations on WDS Addressing Tricci So 7 May 2004 Prepared by

Why do we need to talk about WDS Addressing? 7 May 2004 IEEE 802.11 ESS Mesh PAR Scope: To develop an IEEE 802.11 Extended Service Set (ESS) Mesh* with an IEEE 802.11 Wireless Distribution System (WDS) using the IEEE 802.11 MAC/PHY layers that supports both broadcast/multicast and unicast delivery over self-configuring multi-hop topologies. Purpose: The IEEE 802.11-1999 (2003 edition) standard provides a four-address frame format for exchanging data packets between APs for the purpose of creating a Wireless Distribution System (WDS), but does not define how to configure or use a WDS. The purpose of the project is to provide a protocol for auto-configuring paths between APs over self-configuring multi-hop topologies in a WDS to support both broadcast/multicast and unicast traffic in an ESS Mesh using the four-address frame format or an extension. Why do we need to talk about WDS Addressing? Tricci So

Let’s Examine How WDS Addressing was Defined? 7 May 2004 Let’s Examine How WDS Addressing was Defined? To/From DS Values Meaning To DS = 0 From DS = 0 A data frame direct from one STA to another STA within the same IBSS, as well as all management and control type frames To DS = 1 Data frame destined for the DS. From DS = 1 Data frame exiting the DS Wireless distribution system (WDS) frame being distributed from one AP to another AP. These fields are defined to indicate how the “four addresses” are used for packet forwarding decision using the Link Layer WDS Addressing. Tricci So

However, DS is NOT ONLY Data Link Based ... 7 May 2004 However, DS is NOT ONLY Data Link Based ... ANSI/IEEE Std 802.11, 1999 Edition, page 14 – 5.3: The IEEE 802.11 architecture allows for the possibility that the DS may NOT be identical to an existing wired LAN. A DS may be created from many different technologies including current IEEE 802 wired LANs. IEEE 802.11 does NOT constrain the DS to be either DATA or NETWORK layer based. Nor does IEEE 802.11 constrain a DS to be either centralized or distributed in nature. And, As You Know. . . WDS = Wireless DS Tricci So

A Little History of OSI Model & IEEE 802.2 7 May 2004 A Little History of OSI Model & IEEE 802.2 OSI Model Network Data Link Physical IEEE 802 Model Logical Link Control MAC Access Physical IEEE 802 Standards 802.2 LLC CSMA/CD CSMA/CA Token Bus Token Ring 802.4 Physical 802.11 802.3 802.5 IEEE’s 802 working committee separated Data Link Layer of the OSI into two sublayers: => Logical Link Control (LLC) & Medium Access Control (MAC) The purpose of the LLC sublayer is to provide a consistent interface to Network Layer => ONE LLC sublayer to ALL 802 MAC sublayers Tricci So

Protocol Stack Traversal . . . . . 7 May 2004 Protocol Stack Traversal . . . . . Network Data Link Physical EACH Layer “IS” its own Addressing ORIGINATOR as well as TERMINATOR Network Header Data Network Layer Addressing Link Layer Addressing Data Link Header Network Data Physical Header Data Link Network Data Packet Delivery Decision is determined by the addressing of the given infrastructure which is operating at a particular layer Tricci So

Network Layer WDS Addressing Considerations 7 May 2004 Network Layer WDS Addressing Considerations Link Layer WDS Addressing Network Layer WDS Addressing confusing Reuse SAME “T0-DS/From-DS” Indicator for Network Layer WDS Addressing would be confusing & inappropriate?! Tricci So

Recommendations Link-Layer Based WDS Network-Layer Based WDS 7 May 2004 Recommendations Link-Layer Based WDS AP MAC Layer Addressing Origination & Termination To DS = 1 From DS = 1 Network-Layer Based WDS AP Network Layer Addressing Origination & Termination To DS = 1 From DS = 1 N/A Tricci So

7 May 2004 Backup Slide Protocol Stack Communications Tricci So

Protocol Stack Communications 7 May 2004 Protocol Stack Communications Each layer is responsible for its own addressing to make packet processing, termination and forwarding decision. Network Data Link Physical Logical Control MAC Access MAC Access Control Physical Tricci So