LLDP網(wǎng)絡(luò)技術(shù)概述

1、LLDP網(wǎng)絡(luò)技術(shù)概述技術(shù)創(chuàng)新，變革未來不同廠商的設(shè)備在網(wǎng)絡(luò)上互相發(fā)現(xiàn)和交流，需要一個標(biāo)準(zhǔn)的信息平臺。LLDP(Link Layer Discovery Protocol，鏈路層發(fā)現(xiàn)協(xié)議)，提供了一種標(biāo)準(zhǔn)的鏈路層發(fā)現(xiàn)方式。引入掌握LLDP基本工作原理掌握LLDP常用TLV屬性了解LLDP-MED屬性掌握LLDP基本配置課程目標(biāo)學(xué)習(xí)完本課程，您應(yīng)該能夠：LLDP簡介LLDP基本工作原理LLDP基本配置目錄LLDP簡介LLDP所滿足的需求 LLDP是一個公共標(biāo)準(zhǔn)，使得不同廠商設(shè)備可以拓?fù)浒l(fā)現(xiàn)，獲取對端的能力、配置等信息。LLDP的基本些功能方便不同廠商以標(biāo)準(zhǔn)的方式發(fā)現(xiàn)網(wǎng)絡(luò)拓?fù)湫畔?。使網(wǎng)絡(luò)管理系統(tǒng)有辦

2、法發(fā)現(xiàn)一些影響上層應(yīng)用交互的配置不一致或錯誤。提供信息給網(wǎng)絡(luò)管理系統(tǒng)，幫助定位不一致或錯誤問題。方便在VoIP環(huán)境里，以標(biāo)準(zhǔn)的方式部署和配置媒體終端設(shè)備，如IP電話。LLDP簡介LLDP基本工作原理LLDP基本配置目錄LLDP的端口工作模式LLDP有以下四種工作模式TxRx、Tx、Rx、DisableTxDisableTxRxTxTxRxTxRxTxRxLLDP報文LLDP報文LLDP報文LLDP報文LLDP報文LLDP報文的發(fā)送TxLLDP 報文（周期發(fā)送，默周期30秒）LLDP報文周期發(fā)送TxLLDP 報文（立即發(fā)送報文，報文間隔1秒）LLDP報文快速發(fā)送TxRxLLDP 報文（報文間的最

3、小間隔，默周2秒）LLDP報文延遲發(fā)送TxRxLLDP 報文（從disable到重新始的間隔，默認(rèn)2秒）LLDP重初始化延時LLDP報文的接收TxLLDP 報文（不合法LLDP報文）TxLLDP 報文（合法LLDP報文）RxTxRxTxLLDP 報文（shutdown Frame）TxRx丟棄更新鄰居信息立即老化鄰居信息DisableTxRxTTL超時，老化鄰居信息LLDP的封裝格式兩種封裝格式SNAP封裝格式直接封裝格式LLDP_Multicast addressMAC_addressAAAA-0300-0000-88CCLLDPDUFCSLLDP_Multicast addressMAC_

4、address88CCLLDPDUFCSDASASNAP-encodedLLDP EthertypeInformation fieldDASALLDP EthertypeInformation field6 octets6 octets8 octets4 octets6 octets6 octets2 octets4 octets1500 octetsLLDPDU組成LLDPDU由下面的4個必選TLV和若干可選TLV組成，必選TLV的封裝順序不能改變Chassis ID TLVPort ID TLVTime to Live TLV可選 TLVEnd Of LLDPDU TLVChassis I

5、D TLVPort ID TLVTime to Live TLVOptional TLVOptional TLVEnd Of LLDPDU TLVMMMMM - mandatory TLV 必選TLVLLDP TLV的分類基本TLV格式組織定義TLV格式TLV TYPETLV information string lengthTLV information string9bits7bits0 = n = 511 octets TLV headerTLV type = 127TLV informationstring lengthorganizationallyunique identifier

6、(OUI)organizationallydefined subtypeorganizationally definedinformation string9bits7bits3octets1octet0 = n = 507octets TLV headerTLV information string4- 511octets必選基本TLV介紹Chassis ID TLVPort ID TLVTime To Live TLVEnd of LLDPDU TLV9bitsTLV type = 3TLV information string length =2time to live (TTL)7bi

7、ts2 octets9bitsTLV type=0TLV information string length=07bits9bitsTLV type = 1TLV information string lengthchassis ID subtypechassis ID7bits1 octet1 = n = 255 octets9bitsTLV type = 2TLV information string lengthport ID subtypeport ID7bits1 octet1 = n =255 octets可選基本TLV介紹Port Description TLVSystem Na

8、me TLVSystem Description TLVSystem Capabilities TLVManagement Address TLVTLV type = 4TLV information string lengthport description7bits0 = n =255 octetsTLV type = 5TLV information string lengthsystem name7bitsTLV type = 6TLV information string lengthsystem description7bits9bits9bits0 = n =255 octets

9、9bits0 = n =255 octetsTLV type = 7TLV information string lengthsystem capabilitiesenabled capabilities7bits2 octets2 octets9bitsTLV type=8TLV information string lengthManagement address string lengthManagement address subtypeManagement addressInterface numbering subtypeInterface numberOID string len

10、gthObject identifier7bits9bits1 octet1 octet1-31 octets1 octet4 octet1 octet 0-128 octetsIEEE 802.1組織定義TLV介紹IEEE802.1組織定義格式IEEE802.1組織定義TLV類型TLV type = 127TLV informationstring length00-80-C2（ 802.1 OUI ）802.1 subtype802.1 defined information stringIEEE 802.1 subtype TLV name0Reserved1 Port VLAN ID

11、2Port And Protocol VLAN ID3VLAN Name4Protocol Identity5-255reservedIEEE 802.3組織定義TLV介紹IEEE802.3組織定義TLV格式IEEE803.3組織定義TLV類型TLV type = 127TLV informationstring length00-12-0F（ 802.3 OUI ）802.3 subtype802.3 defined information stringIEEE 802.3 subtype TLV name0Reserved1 MAC/PHY Configuration/Status2Pow

12、er Via MDI3Link Aggregation4Maximum Frame Size5-255reservedLLDP-MED TLV介紹LLDP-MED TLV格式與類型TLV type = 127TLV informationstring length00-12-BB（TIA OUI）LLDP-MED subtypeLLDP-MED defined information stringMED TLV SubtypeTLV Name1LLDP-MED Capabilities2Network Policy3Location Identification4Extended Power-

13、via-MDI5Inventory Hardware Revision6Inventory Firmware Revision7Inventory Software Revision8Inventory - Serial Number9Inventory Manufacturer Name10Inventory - Model Name11Inventory - Asset ID12-255Reserved for future standardizationLLDP簡介LLDP基本工作原理LLDP基本配置目錄LLDP的配置任務(wù)啟動LLDP功能配置LLDP全局參數(shù)配置端口LLDP運(yùn)行參數(shù)使能L

14、LDP功能全局啟動LLDP端口下啟動LLDP端口下配置LLDP的工作模式sysname lldp enable sysname-Ethernet1/0/1 lldp enable sysname-Ethernet1/0/1 lldp admin-status disable | rx | tx | txrx 配置LLDP全局參數(shù)配置快速發(fā)送報文數(shù)配置TTL乘數(shù)配置LLDP定時器sysname lldp fast-count count sysname lldp hold-multiplier valuesysname lldp timer notification-interval inter

15、val sysname lldp timer reinit-delay delay sysname lldp timer tx-delay delaysysname lldp timer tx-interval interval配置端口LLDP運(yùn)行參數(shù)配置管理地址配置封裝類型配置發(fā)送TLV類型啟動LLDP trapsysname-Ethernet1/0/1 lldp management-address-tlv ip-address sysname-Ethernet1/0/1 lldp encapsulation SNAPsysname-Ethernet1/0/1 lldp tlv-enabl

16、e basic-tlv all | port-description | system-capability | system-description | system-name | dot1-tlv all | port-vlan-id | protocol-vlan-id vlan-id | vlan-name vlan-id | dot3-tlv all | link-aggregation | mac-physic | max-frame-size | power | med-tlv all | capability | inventory | location-id civic-ad

17、dress device-type country-code ca-type ca-value & | elin-address tel-number | network-policy | power-over-ethernet sysname-Ethernet1/0/1 lldp notification remote-change enableLLDP的顯示與調(diào)試操作命令查看LLDP本地信息display lldp local-information global | interface interface-type interface-number 查看LLDP遠(yuǎn)端信息display l

18、ldp neighbor-information brief | interface interface-type interface-number brief | list system-name system-name 顯示LLDP統(tǒng)計信息display lldp statistics global | interface interface-type interface-number 顯示LLDP狀態(tài)display lldp status interface interface-type interface-number 顯示TLV配置信息display lldp tlv-config

19、interface interface-type interface-number LLDP的調(diào)試命令debugging lldp all | error | event | fsm interface interface-type interface-number | packet receive | transmit interface interface-type interface-number brief LLDP配置舉例SWA lldp enableSWA-Ethernet1/0/2 lldp enableSWA-Ethernet1/0/2 lldp management-address-tlv 1.0.0.1 SWB lldp enableSWB-Ethernet1/0/2 lldp enab