《國(guó)外無線網(wǎng)絡(luò)設(shè)計(jì)方案.ppt》由會(huì)員分享，可在線閱讀，更多相關(guān)《國(guó)外無線網(wǎng)絡(luò)設(shè)計(jì)方案.ppt（34頁(yè)珍藏版）》請(qǐng)?jiān)谘b配圖網(wǎng)上搜索。

1、CAMPUS NETWORK DESIGN:Wired vs. Wireless,Terry Gray Director, Networks GE for a few Reality: Cat3 wireplant upgrade will take multiple years and multiple millions of dollars,Advanced Services,Multicast Partially deployed Older routers need to be replaced QoS Laissez faire? Premium service? Best with

2、 FD connections. VoIP Needs QoS, extra-high availability POE desirable; implies UPS in closets IPv6,Premium Services?,Wide-area QoS chargeback? Preferred access to Internet for a fee? Lots of interesting policy and tech issues...,Mistakes We Didnt Make,FDDI to the desk VLANs ATM Various cut-thru IP

3、switching digressions Claim: Staying with pure IP and Ethernet has served UW very well...,Current Statistics,Avg Backbone traffic: nearly 2 TB/day Peak Inbound traffic: 100 Mbps (40 in 1999) Peak Outbound traffic: 160 Mbps (20 in 1999) Doubling time: Less than 2 years!! Hosts: over 50,000 Modems: ov

4、er 2,000 Switched subnets: 70% (30% in 1999) 10/100 FD subnets: 25% (5% in 1999) Cat 5 buildings: 10%,UW-S Building/Subnet Status,GigE Buildings,Physics/Astronomy Fisheries Center new Ocean Lander Hall McCarty Hall Parrington Hall Edmondson Pavillion Mary Gates Hall OUG Library,part of Electrical En

5、gr. part of HS K wing part of HS T wing part of Johnson Hall part of Savery part of Thomson Hall part of 4545,Simplified Network Topology,Router,Router,Border Router,Core Switch,Edge Switch,Edge Switch,Interior Switch,Interior Switch,Gigapop,Internet2,,,,,,,,,,,,,,,,,,,,,,,,Desktop,Desktop,Internet,

6、Fed Nets,,,4,30,300,1000+,,Branch Site,50,000,PBX,,,Number of Devices,Backbone Traffic,Border Traffic 1999,Border Traffic 2001,Recurring Theme: Explosive Growth,More users More devices Longer use New (bandwidth-intensive) applications e.g. remote collaboration tools audio/video streaming tele-immers

7、ion distance learning,Networking Hot List,Campus building/subnet upgrades Backbone upgrades (production, experimental) Regional networking Network Hardening Security Advanced Services Wireless Management/diagnostic tools,Success Metrics,10/100 FD connections: xx% Multicast deployment: xx% Qo

8、S deployment: xx% Deptl wireless coverage: xx% Router center hardening: xx% Backbone capacity IPv6 capable routers,On to Wireless...,,Wireless Categories,Wireless by Purpose Point-to-Point links Access networks Wireless by Spectrum Infrared RF Optical,Wireless RF by Range,PAN/HAN (Person

9、al/Home-Area-Network) Bluetooth HomeRF LAN (Local-Area-Network) IEEE 802.11 ETSI HiperLAN2 MAN (Metro-Area-Network) LMDS, “Fixed Wireless” WAN (Wide-Area-Network) Ricochet (R.I.P.) CDPD 2.5G, 3G, etc, etc, etc,LAN Wireless Standards,IEEE 802.11 2.4GHz, 1-2Mbps, FHSS, DSSS IEEE 802.11b 2.4Ghz, 11Mbps

10、 DSSS (WiFi) IEEE 802.11a 5Ghz, 54Mbps ETSI HiperLAN2 5Ghz, 54Mbps, TDMA In US, all use unlicensed “ISM” bands,802.11 ISSUES,Network Design, esp. Topology Access control Security Compatibility Interference Relation to Bluetooth, HomeRF, etc Obsolescence,ROAMING ISSUES,Layer 2 (802.11) vs. Layer 3 (M

11、obile IP) Vendor incompatibility LAN vs. WAN We will support L2 roaming within a building by dedicating one subnet for all access points in the building.,Policy Issues,Part of campus network infrastructure Want to encourage small-scale deployments with minimum overhead, but coordination needed to av

12、oid interference Large-scale deployments need to be coordinated by C&C Campus-wide access control policy,UW-S Wireless Deployment,C&C Pilot Project Kane Hall, Rm. 130 Mary Gates Hall Gerberding Hall Odegaard Undergraduate Library Other wireless projects CS, C&C, Business, MCIS, ...,Pilot Project Obj

13、ectives,Provide 11 Mb coverage throughout selected facilities. Allow roaming within facility space. Develop suitable policies. Gain operational experience.,Pilot Project Lessons Learned,Success depends on cooperation w/depts It takes more wire than you think! Site surveys use SSH, SSL, etc. Technolo

14、gy still evolving 2.4GHz phones interfere badly,Wired vs. Wireless Issues,Server suitability Performance Performance variation Price/Performance Interference Technology maturity Advanced services Security,802.11a: Successor?,Faster Shorter distance More power consumption Probably wont replace 802.11

15、b Probably need WAPs for both,Infrastructure Requirements,Conclusions,Wireless is very addictive. It will be very popular. It will be very problematic. The dust has not settled. In offices, it is not a replacement for wired. In classrooms, lounges, etc, it is but that still requires some wired infra

16、structure.,Wireless References,Open Group: www.openwirelessdata.org Wireless Ethernet Compatibility Alliance (WECA) Wireless LAN Association (WLANA) Portable Computer & Communications Association (PCCA) Internet Engineering Task Force (IETF) WAP Forum Bluetooth Special Interest Group Mobile Wireless Internet Forum (MWIF) Wireless Information Networks Forum (WINForum) HiperLAN2 Global Forum Wireless Data Forum,