【正文】 disabled routed auto auto 10/100/1000Base TX Gi0/8 disabled routed auto 100 10/100/1000Base TX Gi0/9 notconnect routed auto auto 10/100/1000Base TX Gi0/10 notconnect routed auto auto 10/100/1000Base TX Gi0/11 disabled routed auto auto unknown Gi0/12 notconnect routed auto auto unknown Switch show interfaces fastether 0/1 switchport Name: Fa0/1 Switchport: Enabled Administrative Mode: static access Operational Mode: down Administrative Trunking Encapsulation: dot1q Negotiation of Trunking: Off Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 1 (default) Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 21001 Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Voice VLAN: dot1p (Inactive) Appliance trust: 5 Switch show runningconfig interface fastether0/2 Building configuration... Current configuration : 131 bytes ! interface FastEther0/2 switchport mode access switchport protected no ip address mls qos cos 7 mls qos cos override end 刷新、重置端口及計(jì)數(shù)器 Clear 命令目的 clear counters [interfaceid] 清除端口計(jì)數(shù)器 . clear interface interfaceid 重置某一端口的硬件邏輯 clear line [number | console 0 | vty number] 重置異步串口的硬件邏輯 Note clear counters 命令只清除用 show interface 所顯示的計(jì)數(shù)，不影響用snmp 得到的計(jì)數(shù) 舉例如下： Switch clear counters fastether0/5 Clear show interface counters on this interface [confirm] y Switch *Sep 30 08:42:55: %CLEAR5COUNTERS: Clear counter on interface FastEther0/5 by vty1 () 可使用 clear interface 或 clear line 命令來清除或重置某一端口或串口，在大部分情況下并不需要這樣做 : Switch clear interface fastether0/5 關(guān)閉和打開端口 命令目的 Step 1 configure terminal 進(jìn)入配置狀態(tài) Step 2 interface {vlan vlanid} | {{fastether | gigabitether} interfaceid} | {portchannel portchannelnumber} 選擇要關(guān)閉的端口 Step 3 Shutdown 關(guān)閉 Step 4 End 退出 Step 5 show runningconfig 驗(yàn)證 使用 no shutdown 命令重新打開端口 . 舉例如下 : Switch configure terminal Switch(config) interface fastether0/5 Switch(configif) shutdown Switch(configif) *Sep 30 08:33:47: %LINK5CHANGED: Interface FastEther0/5, changed state to a administratively down Switch configure terminal Switch(config) interface fastether0/5 Switch(configif) no shutdown Switch(configif) *Sep 30 08:36:00: %LINK3UPDOWN: Interface FastEther0/5, changed state to up 交換機(jī)端口鏡像配置 『端口鏡像的數(shù)據(jù)流程』 基于端口的鏡像是把被鏡像端口的進(jìn)出數(shù)據(jù)報(bào)文完全拷貝一份到鏡像端口，這樣來進(jìn)行流量觀測(cè)或者故障定位。 三層以太網(wǎng)通道口（ EtherChannel） : ：以太通道由被路由端口組成。 但對(duì)于 SFP端口則不能配置速率及雙工模式，有時(shí)可以配置 nonegotiate,當(dāng)需要聯(lián)接不支持自適應(yīng)的其它千兆端口時(shí) 表 32 管理口配置 命令目的 Step 1 configure terminal 進(jìn)入配置狀態(tài) . Step 2 interface interfaceid 進(jìn)入端口配置狀態(tài) . Step 3 speed {10 | 100 | 1000 | auto | nonegotiate} 設(shè)置端口速率注 1000 只工作在千兆口 . GBIC 模塊只工作在 1000 Mbps 下 . nonegotiate 只能在這些 GBIC上用 1000BASESX, LX, and ZX GBIC. Step 4 duplex {auto | full | half} 設(shè)置全雙工或半雙工 . Step 5 end 退出 Step 6 show interfaces interfaceid 顯示有關(guān)配置情況 Step 7 copy runningconfig startupconfig 保存 Switch configure terminal Switch(config) interface fastether0/3