業(yè)務(wù)支撐網(wǎng)網(wǎng)絡(luò)技術(shù)第二層交換機(jī)的功能-全文預(yù)覽
【正文】 hport portsecurity 查看端口安全 ? Switch show portsecurity ? Secure Port MaxSecureAddr CurrentAddr SecurityViolation Security Action ? (Count) (Count) (Count) ? ? Fa0/2 1 1 0 Shutdown ? ? Total Addresses in System (excluding one mac per port) : 0 ? Max Addresses limit in System (excluding one mac per port) : 1024 The End 謝 謝 :05:5013:0513::05 13:0513:05::05:50 2023年 2月 3日星期五 1時 5分 50秒 ? 靜夜四無鄰，荒居舊業(yè)貧。這樣對方的交換機(jī)就會在自己的 Root Port和原本處于 Blocking狀態(tài)的端口都收到 BPDU了。 路徑的開銷 鏈路帶寬 鏈路開銷 10Gbps 2 1Gbps 4 100Mbps 19 10Mbps 100 STP的操作 ? 選舉根網(wǎng)橋 ? 選舉根端口 ? 選舉指定端口 ? 非指定端口 STP的操作 STP的計算 STP的收斂 ? 收斂 (convergence) 當(dāng)所有端口變遷到轉(zhuǎn)發(fā)或堵塞狀態(tài)時，網(wǎng)絡(luò)開始收斂，在網(wǎng)絡(luò)收斂完成前，所有的數(shù)據(jù)不能被傳送。指定端口將被標(biāo)記為轉(zhuǎn)發(fā)端口 .可以轉(zhuǎn)發(fā)數(shù)據(jù)幀。 STP的術(shù)語 非根網(wǎng)橋 ? 非根網(wǎng)橋是除根網(wǎng)橋外的所有其他網(wǎng)橋 STP的術(shù)語 根端口 ? 根端口 (Root Port)是在所有非根網(wǎng)橋中選舉連接到根網(wǎng)橋開銷路徑最小的鏈路所在的端口 ,如果有開銷相同的路徑則使用 PID最小的端口。 the frame is not flooded. 過濾幀 (Filtering Frames ) ? Station A sends a frame to station B. ? The switch has the address for station B in the MAC address table. ? Station D sends a broadcast or multicast frame. ? Broadcast and multicast frames are flooded to all ports other than the originating port. ? 廣播 MAC地址： 組播 MAC地址范圍 ： 01:00:5E:00:00:0001:00:5E:FF:FF:FF 廣播和組播幀 (Broadcast and Multicast Frames) 冗余 (Redundant) ? 優(yōu)點(diǎn)：冗余能夠避免單點(diǎn)故障 ? 缺點(diǎn)：交換循環(huán) (Switch loop) 交換循環(huán)的危害 ? 廣播風(fēng)暴 (Broadcast Storms) ? 多幀復(fù)制 (Multiple Frame copies) ? MAC地址表不穩(wěn)定（ MAC Database Instability） ? Host X sends a broadcast. ? Switches continue to propagate broadcast traffic over and over. 廣播風(fēng)暴 (Broadcast Storms) ? Host X sends a unicast frame to router Y. ? The MAC address of router Y has not been learned by either switch. ? Router Y will receive two copies of the same frame. 多幀復(fù)制 (Multiple Frame copies) ? Host X sends a unicast frame to router Y. ? The MAC address of router Y has not been learned by either switch. ? Switches A and B learn the MAC address of host X on port 0. ? The frame to router Y is flooded. ? Switches A and B incorrectly learn the MAC address of host X on port 1. MAC地址表不穩(wěn)定 (MAC Database Instability） 生成樹協(xié)議 ? 生成樹協(xié)議 (Spanningt
物理相關(guān)推薦
鄂ICP備17016276號-1