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3Com SuperStack3 Switch4200系列交換機(jī)中文電子手抄本( 五 )


【端口安全PortSecurity】前面在基本的二層交換功能中介紹過,可以把某臺(tái)設(shè)備的MAC地址手工寫到4200的某個(gè)端口上,這樣,這個(gè)設(shè)備只能連到該端口,假如連到其他端口,則不通 。用戶在使用中經(jīng)常有與其相反的應(yīng)用,即某個(gè)端口只答應(yīng)某一臺(tái)或幾臺(tái)設(shè)備接入,而不答應(yīng)其他設(shè)備接入,這時(shí)候可以利用4200交換機(jī)的PortSecurity功能 。Select menu option: secu net accMenu options: --------------3Com SuperStack 3 Switch 4200---------------portSecurity;;;;- Configure port securityType "quit" to return to the previous menu or; ? for help----------------------------------------- (1)---------------------------Select menu option (security/network/Access): portsSelect user ports (unit:port...,?): 1:3Enter mode of operation (?)[noSecurity]: ?One of the following items may be selected at this prompt:noSecurity,continuallyLearn,autoLearnEnter mode of operation (?)[noSecurity]: autolEnter the number of authorized addresses (0-79)[1]: 5Enter Disconnect Unauthorized Device mode (?)[noAction]: ?One of the following items may be selected at this prompt:noAction,permanentlyDisable,temporaryDisableEnter Disconnect Unauthorized Device mode (?)[noAction]: noacSelect menu option (security/network/access):[說明]上面例子中,端口3設(shè)置為autolearn方式,答應(yīng)的地址個(gè)數(shù)為5個(gè)(該端口所學(xué)到的前5個(gè)地址),對(duì)于5個(gè)以后的MAC地址,設(shè)備即使連到端口3上,也不能通信 。下面是一些簡單的參數(shù)說明,mode of operation有3個(gè)參數(shù),noSecurity,continuallyLearn及autoLearn 。假如針對(duì)一個(gè)端口設(shè)置,選擇autoLearn 。DUD-Disconnect Unauthorized Device模式有三個(gè),noAction,permanentlyDisable,temporaryDisable 。假如選擇后兩個(gè),當(dāng)端口上所學(xué)到的MAC地址超過答應(yīng)的個(gè)數(shù)時(shí),該端口會(huì)自動(dòng)down掉;假如選擇noAction,端口不會(huì)閉塞,但后面連上來的設(shè)備不能通信,這是大部分情況下我們希望的 。
【組播過慮-Multicast Filter】4200支持組播過慮功能 ??梢酝ㄟ^設(shè)置IGMP的Snooping和Querying來實(shí)現(xiàn) 。其命令行方式如下:Select menu option: bri multi igmpMenu options: --------------3Com SuperStack 3 Switch 4200---------------queryMode; - Enable/disable IGMP queryingsnoopMode; - Enable/disable IGMP Multicast learningType "quit" to return to the previous menu or; ? for help----------------------------------------- (1)---------------------------Select menu option (bridge/multicastFilter/igmp): queryEnter new value (enable,disable)[disable]: enSelect menu option (bridge/multicastFilter/igmp): snoopmoEnter new value (enable,disable)[enable]: en[說明]當(dāng)snoopmode為disable時(shí),交換機(jī)會(huì)把組播數(shù)據(jù)包當(dāng)作廣播來處理,即向所有端口轉(zhuǎn)發(fā) 。此時(shí)網(wǎng)絡(luò)環(huán)境中假如有組播應(yīng)用,一定會(huì)通,但浪費(fèi)帶寬,喪失了組播的優(yōu)勢 。當(dāng)snoopmode為enable時(shí),4200交換機(jī)會(huì)對(duì)組播數(shù)據(jù)進(jìn)行過慮,端口所連設(shè)備要接受組播數(shù)據(jù),就向該端口轉(zhuǎn)發(fā),否則,就不向該端口轉(zhuǎn)發(fā) 。注重當(dāng)snoopmode為enable時(shí),本網(wǎng)段中必須有一臺(tái)設(shè)備的querymode設(shè)置為enable,這樣,才能知道網(wǎng)絡(luò)中那些計(jì)算機(jī)要接受組播 。
【軟件升級(jí)】4200的軟件可以在3Com的英文網(wǎng)站免費(fèi)獲得,但需要用戶先注冊,并將4200產(chǎn)品進(jìn)行注冊,當(dāng)然,產(chǎn)品每種只注冊一臺(tái)即可 。建議用TFTP方式對(duì)4200交換機(jī)進(jìn)行升級(jí),升級(jí)時(shí),4200作為Client端,存有4200軟件的計(jì)算機(jī)作為TFTP的Server 端 。TFTP的軟件在3Com的網(wǎng)站上可以免費(fèi)下載,在隨機(jī)的光盤中也有 。升級(jí)過程在每個(gè)版本的ReleaseNote中有具體介紹,一般在文檔的最后 。Select menu option: sys conMenu options: --------------3Com SuperStack 3 Switch 4200---------------initialize - Reset to factory defaultsreboot;;- Perform system rebootsoftwareUpgrade;- Perform agent software upgradeType "quit" to return to the previous menu or; ? for help----------------------------------------- (1)---------------------------Select menu option (system/control): softTFTP Server Address [0.0.0.0]:10.10.10.8File Name[]:s4202_03.bin[說明]以上10.10.10.8是與4200所連的TFTP Server的地址 。S4202_03.bin是從3Com網(wǎng)站上下載的4200的軟件,應(yīng)該保存在TFTP Server的默認(rèn)目錄下 。從3Com網(wǎng)站上下載的是.exe文件,運(yùn)行后釋放出升級(jí)軟件及該軟件版本的ReleaseNotes,要求用戶在升級(jí)前一定要讀一遍ReleaseNotes 。

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