Chapter 15 Local Area Network Overview

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1 Chapter 15 Local Area Network Overview

2 LAN Topologies

3 Bus and Tree Bus: stations attach through tap to bus full duplex allows transmission and reception transmission propagates throughout medium heard by all stations terminator at each end Tree: a generalization of bus branching cable with no closed loops tree layout begins at headend and branches out heard by all stations

4 Frame Transmission on Bus LAN

5 Ring Topology a closed loop of repeaters joined by point-topoint links receive data on one link & retransmit on another links unidirectional stations attach to repeaters data transmitted in frames circulate past all stations destination recognizes address and copies frame frame circulates back to source where it is removed medium access control determines when a station can insert frame

6 Frame Transmission Ring LAN

7 Star Topology each station connects to common central node usually via two point-to-point link one for transmission and one for reception central node operate in broadcast fashion physical star, logical bus only one station can transmit at a time (hub) can act as frame switch

8 Choice of Topology medium wiring layout access control reliability factors: performance expandability

9 Bus LAN Transmission Media twisted pair early LANs used voice grade cable scaling up for higher data rates not practical baseband coaxial cable uses digital signaling original Ethernet cont

10 Bus LAN Transmission Media broadband coaxial cable used in cable TV systems analog signals at radio and TV frequencies expensive, hard to install and maintain optical fiber expensive taps better alternatives available only baseband coaxial cable has achieved widespread use

11 Ring and Star Topologies Ring Star very high speed links over long distances potential of providing best throughput single link or repeater failure disables network uses natural layout of wiring in building best for short distances high data rates for small number of devices

12 Choice of Medium constrained by LAN topology capacity to support the expected network traffic reliability to meet requirements for availability types of data supported tailored to the application environmental scope provide service over the range of environments

13 Media Available

14 LAN Protocol Architecture

15 IEEE 802 Layers Physical Layer Encoding / decoding of signals preamble generation / removal bit transmission / reception transmission medium and topology

16 IEEE 802 Layers Logical Link Control Layer (LLC) provide interface to higher levels perform flow and error control Media Access Control on transmit assemble data into frame on reception disassemble frame, perform address recognition and error detection govern access to transmission medium for same LLC, may have several MAC options

17 LAN Protocols in Context

18 Logical Link Control transmission of link level PDUs between stations must support multi-access, shared medium relieved of some details of link access by the MAC layer addressing involves specifying source and destination LLC users referred to as service access points (SAPs)

19 LLC Services unacknowledged connectionless service data-gram style service delivery of data is not guaranteed connection-mode service logical connection is set up between two users flow and error control are provided acknowledged connectionless service datagrams are to be acknowledged, but no logical connection is set up

20 LLC Service Alternatives unacknowledged connectionless service requires minimum logic avoids duplication of mechanisms preferred option in most cases connection-mode service used in simple devices provides flow control and reliability mechanisms acknowledged connectionless service large communication channel needed time critical or emergency control signals

21 LLC Protocol modeled after HDLC asynchronous balanced mode connection mode (type 2) LLC service unacknowledged connectionless service using unnumbered information PDUs (type 1) acknowledged connectionless service using 2 new unnumbered PDUs (type 3) permits multiplexing using LSAPs

22 MAC Frame Format

23 Medium Access Control (MAC) Protocol controls access to the transmission medium key parameters: where greater control, single point of failure more complex, but more redundant how synchronous capacity dedicated to connection, not optimal asynchronous response to demand round robin, reservation, contention

24 Asynchronous Systems round robin each station given turn to transmit data reservation divide medium into slots good for stream traffic contention all stations contend for time good for bursty traffic simple to implement tends to collapse under heavy load

25 MAC Frame Handling MAC layer receives data from LLC layer PDU is referred to as a MAC frame fields: MAC control destination MAC address source MAC address LLC CRC MAC layer detects errors and discards frames LLC optionally retransmits unsuccessful frames

26 Bridges connects similar LANs with identical physical and link layer protocols minimal processing can map between MAC formats reasons for use: reliability performance security geography

27 Bridge Function

28 Bridge Design Aspects no modification to frame content or format no encapsulation exact bitwise copy of frame buffering to meet peak demand contains routing and address intelligence may connect more than two LANs bridging is transparent to stations

29 Bridge Protocol Architecture IEEE 802.1D defines architecture MAC level designates endpoint bridge does not need LLC layer captures frame removes encapsulation transmits to destination encapsulates it forwards it across link

30 Connection of Two LANs

31 Bridges and LANs with Alternative Routes

32 Frame Forwarding maintain forwarding database for each port for a frame arriving on port X: search forwarding database to see if MAC address is listed for any port except X if address not found, forward to all ports except X if address listed for port Y, check port Y for blocking or forwarding state if not blocked, transmit frame through port Y

33 Address Learning can preload forwarding database when frame arrives at port X, it has come from the LAN attached to port X use source address to update forwarding database for port X to include that address have a timer on each entry in database if timer expires, entry is removed each time frame arrives, source address checked against forwarding database if present timer is reset and direction recorded if not present entry is created and timer set

34 Loop of Bridges

35 Interconnecting LANs - Hubs active central element of star layout each station connected to hub by two UTP lines hub acts as a repeater limited to about 100m by UTP properties optical fiber may be used out to 500m physically star, logically bus transmission from a station seen by all others if two stations transmit at the same time have a collision

36 Two Level Hub Topology

37 Buses, Hubs and Switches bus configuration all stations share capacity of bus (e.g. 10Mbps) only one station transmitting at a time hub uses star wiring to attach stations transmission from any station received by hub and retransmitted on all outgoing lines only one station can transmit at a time total capacity of LAN is 10 Mbps can improve performance using a layer 2 switch can switch multiple frames between separate ports multiplying capacity of LAN

38 Shared Medium Bus and Hub

39 Layer 2 Switch Benefits no change to attached devices to convert bus LAN or hub LAN to switched LAN e.g. Ethernet LANs use Ethernet MAC protocol have dedicated capacity equal to original LAN assuming switch has sufficient capacity to keep up with all devices scales easily additional devices attached to switch by increasing capacity of layer 2

40 Types of Layer 2 Switches store-and-forward switch accepts frame on input line, buffers briefly, routes to destination port see delay between sender and receiver boosts overall integrity cut-through switch use destination address at beginning of frame switch begins repeating frame onto output line as soon as destination address is recognized highest possible throughput risk of propagating bad frames

41 Layer 2 Switch vs. Bridge differences between switches & bridges: Bridge frame handling done in software analyzes and forwards one frame at a time uses store-andforward operation Switch performs frame forwarding in hardware can handle multiple frames at a time can have cutthrough operation layer 2 switch can be viewed as full-duplex hub incorporates logic to function as multiport bridge new installations typically include layer 2 switches with bridge functionality rather than bridges

42 A Partitioned LAN Configuration

43 Virtual LANs (VLANs) subgroup within a LAN created by software combines user stations and network devices into a single broadcast domain functions at the MAC layer router required to link VLANs physically dispersed but maintains group identity

44 A VLAN Configuration

45 Defining VLANs broadcast domain consisting of a group of end stations not limited by physical location and communicate as if they were on a common LAN membership by: port group MAC address protocol information

46 Communicating VLAN Membership Switches need to know VLAN membership configure information manually network management signaling protocol frame tagging (IEEE802.1Q)

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