荣耀彩票代理

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VLAN虚拟局域网技术(一)计算机网络

作者:冯兴伟  来源:IT165收集  发布日期:2016-12-02 20:48:50

荣耀彩票代理  BENWENZHUYAOZHISHILAIYUANYUXUEXIAOKECHENG,BUFENZHISHILAIZIYUH3CGONGSIJIAOCAI,WEIJINGXUKE,JINZHIZHUANZAI。RUXUZHUANZAI,QINGLIANXIZUOZHEBINGZHUMINGCHUCHU。

  1.  VLAN(Virtual LAN):WOMENCHENGZHIWEIXUNIJUYUWANG,TADEZUOYONGJIUSHIJIANGWULISHANGHULIANDEWANGLUOZAILUOJISHANGHUAFENWEIDUOGEHUBUXIANGGANDEWANGLUO,ZHEIXIEWANGLUOZHIJIANSHIWUFATONGXUNDE,JIUHAOXIANGHUXIANGZHIJIANMEIYOULIANJIEYIYANG,YINCIGUANGBOYEJIUGELIKAILE。  

荣耀彩票代理  SHIXIANYUANLI:TONGGUOJIAOHUANJIDEKONGZHI,MOUYIVLANCHENGYUANFACHUDESHUJUBAOJIAOHUANJIZHIFAJITONGYIVLANDEQITACHENGYUAN,ERBUHUIFAJIGAIVLANCHENGYUANYIWAIDEJISUANJI。JIANYANZHI,YIGEVLANJIUSHIYIGEGUANGBOYU。

  WEISHENMEXUYAOVLAN?

荣耀彩票代理  WEIYUXIEYIDI2CENGDEJIAOHUANJISUIRANNENGGELICHONGTUYU,TIGAOMEIYIGEDUANKOUDEXINGNENG,DANBINGBUNENGGELIGUANGBOYU,BUNENGJINXINGZIWANGHUAFEN,BUNENGCENGCIHUAGUIHUAWANGLUO,GENGWUFAXINGCHENGWANGLUODEGUANLICELVE,YINWEIZHEIXIEGONGNENGQUANDOUSHUYUWANGLUODEDISANCENG———WANGLUOCENG。YINCI,RUGUOZHIYONGJIAOHUANJILAIGOUZAOYIGEDAXINGJISUANJIWANGLUO,JIANGHUIXINGCHENGYIGEJUDADEGUANGBOYU,JIEGUOSHI,WANGLUODEXINGNENGHUIJIANGDIYIZHIWUFAGONGZUO,WANGLUODEGUANLISHUSHOUWUCE,ZHEIYANGDEWANGLUOSHIBUKEXIANGXIANGDE。

  JUGELIZI:CHUANTONGDEERCENGJIAOHUANJISUOYOUDUANKOUDOUSHUYUYIGEGUANGBOYU,ZHEIYANGJIUBUBIANYUGUANLIHEWANGLUOBIANHUA,JIASHEYIGEYONGHUXIANZAISHUYUGONGZUOZU1,YUGONGZUOZU1NEIDEYONGHUZAITONGYIGELANZHONG,YIDUANSHIJIANHOUYAOBAGAIYONGHUHUAFENDAOGONGZUOZU2ZHONG,YAOJIARUDAOGONGZUOZU2ZHONGDELAN,NEIMEBIXUZHONGXINLIANXIAN。ZHEIZHONGJIWANGLUOGUANLIDAILAILEBUFANGBIAN。ZHEIYANGJIUZAICHUANTONGERCENGJIAOHUANJISHANGYINRULEVLAN(Virtual LAN)。MEIGEVLANZHONGDESUOYOUJIEDIANZAITONGYIGEGUANGBOYU,MEIGEVLANSHILUOJILAN,VLANZHIJIANSHIERCENGGELIDE。

  VLAN产生由来:交换机的设计者们借鉴了路由结构中子网的思路,得出了虚网的概念,即通过对网络中的IP地址或MAC地址或交换端口进行划分,使之分属于不同的部分,每一个部分形成一个虚拟的局域网络,共享一个单独的广播域。这样就可以把一个大型交换网络划分为许多个独立的广播域,即VLAN。

  VLANMINGLINGPEIZHI:

  

  ZHEIMEZUODEHAOCHUNI?(ZHAIZIH3CGONGSIJISHUTIANTIANQUAN)

  (1). GUANGBOYUBEIXIANZHIZAIYIGEVLANNEI,JIESHENGLEDAIKUAN,TIGAOLEWANGLUOCHULINENGLI

  (2). 增强局域网的安全性:VLAN间不能直接通信,即一个VLAN内的用户不能和其它VLAN内的用户直接通信,而需要通过路由器或三层交换机等三层设备

  (3). LINGHUOGOUJIANXUNIGONGZUOZU:YONGVLANKEYIHUAFENBUTONGDEYONGHUDAOBUTONGDEGONGZUOZU,TONGYIGONGZUOZUDEYONGHUYEBUBIJUXIANYUMOUYIGUDINGDEWULIFANWEI,WANGLUOGOUJIANHEWEIHUGENGFANGBIANLINGHUO

荣耀彩票代理  2.   KUASHEBEIDEVLANHULIANYU802.1QXIEYI

  KUASHEBEIDEVLANCHENGYUANHULIANDEZUWANG,JIUBIRANSHEJIDAOBUTONGVLANLIULIANGSHIBIEDEWENTI,RUXIATU。

  

  为了解决VLAN流量识别的问题,思科荣耀彩票代理公司和IEEE分别提出了ISL和802.1Q标准。

  交换链路内协议(ISL),是思科私有协议,我们在这不详细谈。

  XIANGKANISLZHENGESHIWOJIUFANGGETUHAOLE:FENGZHUANGYITAIWANGZHENE。802.1QSHICHARUBIAOQIAN,BUSHIFENGZHUANG,ZHEISHICHABIE。

  

  ZHEZHONGLAIKANYIXIAIEEE TICHUDE802.1QBIAOZHUNSHIZENMEJIEJUEVLANLIULIANGSHIBIEDEWENTIDEBA?

荣耀彩票代理  802.1QXIEYI:ZAIKUASHEBEIZHUANFASHIJIBAOWENDASHANGVLANXINXI,RUDASHANGVLANBIAOQIAN,BIAOSHIBAOWENSUOSHUDEVLAN,JIAOHUANJITONGGUODUIBAOWENZHONGVLANXINXIDESHIBIEJINXINGXIANGYINGDEZHUANFA。

荣耀彩票代理  IEEE 802.1QZHENGESHISHIZAICHUANTONGYITAIWANGZHENGESHISHANGDINGYIYIGEXINDEYITAIWANGZHENZIDUAN。

  

荣耀彩票代理  SHANGTUZHONGDE0x8100WEIGUDINGZIDUAN,YINGWENWEIEtype。BIAOSHIBAOWENDEFENGZHUANGLEIXINGWEIYITAIWANGDE802.1QFENGZHUANG。

荣耀彩票代理  PriYOUXIANJIZHUYAOYONGYUDANGJIAOHUANJICHUDUANKOUFASHENGYONGSAISHI,JIAOHUANJITONGGUOSHIBIEGAIYOUXIANJI,YOUXIANFASONGYOUXIANJIGAODESHUJUBAO。

荣耀彩票代理  CFI:GUIFANGESHIZHISHIQI,ZONGSHIBEISHEZHIWEI0.  CFICHANGYONGYUYITAIWANGLEIWANGLUOHELINGPAIHUANLEIWANGLUOZHIJIAN,RUGUOZAIYITAIWANGDUANKOUJIESHOUDEZHENJUYOUCFI,NEIMESHEZHIWEI1,BIAOSHIGAIZHENBUJINXINGZHUANFA(DAZHEITIAOXIANSHIYINWEIZHEIZHISHIZHIZUOLEJIEJIKE)

荣耀彩票代理  VLAN ID: GAIZIDUANWEI12bit,ZUIDAZHICHI4096GEVLAN,YINWEI2^12=4096。

  GUANYUVLAN ID,XIAMIANJICHUYIGEJUTIDEBIAO,XIJIEJIUBUZHUISHULE。

  

荣耀彩票代理  JUEDEHAISHIJIANGJIANGNATIVE VLANBIJIAOHAO。

荣耀彩票代理  Native VLAN:BENDIVLAN,YIGEVLANDEZHENZHINENGZHUANFADAOSHUYUTONGYIGEVLANDEDUANKOUHUOZHEGANDAODUANKOU。

  ZHIYOUFAWANGGANDAODUANKOUDEZHENCAIXUYAOJIASHANGVLAN ID。CONGGANDAOSHOUDAODEZHENZHONGRUGUOMEIYOUVLAN ID,ZERENWEISHIBENDIVLAN(Native VLAN),MORENWEIVLAN 1。

  ISLJIUMEIYOUNative VLANZHEIGEGAINIANLE。ZHIYOUIEEE 802.1QBIAOZHUNCAIYOU。

  

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