These lemmas together with spanning tree protocol and local address forwarding information for transparent bridges are taken to fulfil physical topology discovery in subnet finely 以引理為基礎(chǔ),利用生成樹協(xié)議和地址轉(zhuǎn)發(fā)表,解決了對(duì)于網(wǎng)內(nèi)物理拓?fù)涞恼_發(fā)現(xiàn),更細(xì)致地顯示整個(gè)網(wǎng)絡(luò)拓?fù)洹?i class="labawb" onClick="playMp3('sound_c_1')">
Redundant power supplies, hot-swappable modules and spanning tree protocol ( stp ) support are all mandatory elements of a backbone switch, as is support for emerging switch technologies, including virtual lans 具有冗余能力的電源、可熱插拔的模塊和對(duì)生成樹協(xié)議(stp)的支持都是基干交換機(jī)必備的成分,實(shí)際上它支持新出現(xiàn)的交換技術(shù),如虛擬局域網(wǎng)。
The software system is made up of several parts, including the embedded linux os, the switch's driver software, and some upper level protocol software such as the igmp snooping protocol, the asymmetric vlan management protocol and the spanning tree protocol 本文主要論述了基于以太網(wǎng)的社區(qū)寬帶接入系統(tǒng)中,接入交換機(jī)軟件系統(tǒng)的設(shè)計(jì)和實(shí)現(xiàn),包括交換機(jī)底層驅(qū)動(dòng)程序、組播和生成樹等協(xié)議、vlan配置管理以及交換機(jī)配置管理等功能的實(shí)現(xiàn)。
The creativity of the work in the paper can be shown as the following four aspects : ( 1 ) for single subnet, the condition of simple link judgement is added into the ptda, so the algorithm is improved well; ( 2 ) for multiple subnets, the ptda becomes more effective, benefited from use of breadth-first-search algorithm of graph, port-deletion method etc; ( 3 ) due to suitable adoption of the three protocols stp, snmp and arp, the ptda based on spanning tree protocol can get very effective and correct; ( 4 ) owing to the employment of ieee802.1 q, the ptda of vlan is all-purpose to some extent 本文的創(chuàng)新之處主要體現(xiàn)在以下四個(gè)方面:在單子網(wǎng)物理拓?fù)浒l(fā)現(xiàn)算法中,增加了判斷簡單連接的條件,使算法更加完善;在多子網(wǎng)物理拓?fù)浒l(fā)現(xiàn)算法中采用圖的廣度優(yōu)先遍歷方法、端口刪除方法等,該算法更加有效;在生成樹協(xié)議物理拓?fù)浒l(fā)現(xiàn)算法中,正確使用stp、snmp和arp三種協(xié)議,物理拓?fù)浒l(fā)現(xiàn)非常準(zhǔn)確;在vlan物理拓?fù)浒l(fā)現(xiàn)算法中,正確運(yùn)用了ieee802.1q協(xié)議,該算法具有通用性。