MTU不一致导致线路周期性丢包.docx

MTU不一致导致线路周期性丢包.docx

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MTU不一致导致线路周期性丢包不一致导致线路周期性丢包MTU协商不一致导致线路周期性丢包一、网络拓扑情况，二、网络大致情况说明：

该网络采用思科4507交换机作为该单位网络核心交换机设备，因前期施工和后期成本等问题，导致该网络到互联网和到上级集团公司的专线接入均在一台接入交换机原3560上，该设备和其他接入交换机一样，上行链路均采用trunk方式和思科4507连接，由于对端返程路由等配置（对端接入设备的下一跳思科4507，不是接入交换机3560）问题、此台3560接入交换机工作于透明模式。

到分公司的网络通过4507连接的一台3507路由器连接。

三、问题说明因该单位网络改造等原因，特用H3C的汇聚交换机5500替换原接入3650交换机所在网络位置（如红色圆圈表示），配置均采取和原接入交换机思科3560一致，该设备配置量只有上行接口trunk封装、用户vlan、管理地址（1.1.1.2）、指向核心设备4507的默认路由等。

UserAccessVerificationPassword:

3550-bgenPassword:

3550-bg#showrunBuildingconfiguration.Currentconfiguration:

5028bytes!

version12.2noservicepadservicetimestampsdebuguptimeservicetimestampsloguptimeservicepassword-encryption!

hostname3550-bg!

enablesecret5$1$TEZy$Z3dYM7Yz6p4tR4pfzj9O6.enablepassword7094F471A1A0A!

usernamecisconoaaanew-modelsystemmturouting1500ipsubnet-zeroiprouting!

nofileverifyautospanning-treemodepvstspanning-treeextendsystem-id!

vlaninternalallocationpolicyascending!

interfaceFastEthernet0/1descriptioninternetswitchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/2descriptionguangyuwangswitchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/3switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/4switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/5switchportaccessvlan3switchportmodeaccess!

interfaceFastEthernet0/6descriptionshipinhuiyiswitchportaccessvlan3switchportmodeaccess!

interfaceFastEthernet0/7descriptionBG-shebeibuswitchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/8descriptionBG-cheduiswitchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/9switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/10switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/11switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/12switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/13switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/14switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/15switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/16switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/17switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/18switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/19switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/20switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/21switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/22switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/23switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/24switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/25switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/26switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/27switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/28switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/29switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/30switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/31switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/32switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/33switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/34switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/35switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/36switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/37switchportaccessvlan2switchportmodeaccessspeed100duplexfull!

interfaceFastEthernet0/38switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/39switchportaccessvlan2switchportmodeaccessspeed100duplexfull!

interfaceFastEthernet0/40switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/41switchportaccessvlan2switchportmodeaccessspeed100duplexfull!

interfaceFastEthernet0/42switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/43switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/44switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/45switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/46switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/47switchportaccessvlan2switchportmodeaccess!

interfaceFastEthernet0/48descriptionHS-BGswitchporttrunkencapsulationdot1qswitchporttrunkallowedvlan2,3switchportmodetrunk!

interfaceGigabitEthernet0/1descriptionHS-BGswitchporttrunkencapsulationislswitchportmodetrunk!

interfaceGigabitEthernet0/2switchportmodedynamicdesirable!

interfaceGigabitEthernet0/3switchportmodedynamicdesirable!

interfaceGigabitEthernet0/4switchportmodedynamicdesirable!

interfaceVlan1descriptionguanliipaddress1.1.1.2255.255.255.0!

ipclasslessiphttpserver!

control-plane!

linecon0linevty04password7094F471A1A0Aloginlinevty515login!

monitorsession1sourceinterfaceFa0/1end3550-bg#核心交换机思科4507配置：

该设备配置量为用户网关、vlan配置、到集团公司、互联网、分公司的静态路由配置。

Password:

4507-misenPassword:

4507-mis#showrunBuildingconfiguration.Currentconfiguration:

16281bytes!

version12.2noservicepadservicetimestampsdebuguptimeservicetimestampsloguptimeservicepassword-encryptionservicecompress-confignoservicedhcp!

hostname4507-mis!

enablepassword7110A1016141D!

usernameciscoipsubnet-zero!

spanning-treemodepvstspanning-treeextendsystem-idpowerredundancy-moderedundant!

redundancymoderpr!

interfaceGigabitEthernet1/1!

interfaceGigabitEthernet1/2!

interfaceGigabitEthernet2/1!

interfaceGigabitEthernet2/2!

interfaceGigabitEthernet3/1descriptionHS-JKswitchporttrunkencapsulationislswitchportmodetrunk!

interfaceGigabitEthernet3/2descriptionHS-TXswitchporttrunkencapsulationislswitchportmodetrunk!

interfaceGigabitEthernet3/3descriptionHS-BGswitchporttrunkallowedvlan2switchporttrunkallowedvlanadd3switchporttrunkencapsulationdot1qswitchportmodetrunk!

interfaceGigabitEthernet3/4descriptionHS-SM-1switchporttrunkencapsulationislswitchportmodetrunk!

interfaceGigabitEthernet3/5descriptionHS-SM-2switchportaccessvlan3switchporttrunkencapsulationislswitchportmodeaccess!

interfaceGigabitEthernet3/6switchportaccessvlan4switchportmodeaccess!

interfaceGigabitEthernet4/1switchportaccessvlan4switchportmodeaccessipaccess-group1in!

interfaceGigabitEthernet4/2switchportaccessvlan4switchportmodeaccess!

interfaceGigabitEthernet4/3switchportaccessvlan4switchportmodeaccess!

interfaceGigabitEthernet4/4switchportaccessvlan4switchportmodeaccess!

interfaceGigabitEthernet4/5switchportaccessvlan4switchportmodeaccess!

interfaceGigabitEthernet4/6switchportaccessvlan4switchportmodeaccess!

interfaceGigabitEthernet5/1!

interfaceGigabitEthernet5/2!

interfaceGigabitEthernet5/3!

interfaceGigabitEthernet5/4!

interfaceGigabitEthernet5/5!

interfaceGigabitEthernet5/6switchportaccessvlan4switchportmodeaccess!

interfaceFastEthernet6/1descriptionSMswitchportaccessvlan3switchportmodeaccess!

interfaceFastEthernet6/2descriptionsisswitchportaccessvlan3!

interfaceFastEthernet6/3switchportaccessvlan3!

interfaceFastEthernet6/4descriptionHS-BGswitchporttrunkencapsulationislswitchportmodetrunk!

interfaceFastEthernet6/5switchportaccessvlan4!

interfaceFastEthernet6/6switchportaccessvlan4!

interfaceFastEthernet6/7description346-2switchportaccessvlan4!

interfaceFastEthernet6/8switchportaccessvlan4!

interfaceFastEthernet6/9switchportaccessvlan4!

interfaceFastEthernet6/10switchportaccessvlan4speed100duplexfull!

interfaceFastEthernet6/11descriptionoa-serverswitchportaccessvlan2!

interfaceFastEthernet6/12switchportaccessvlan4!

interfaceFastEthernet6/13switchportaccessvlan4!

interfaceFastEthernet6/14switchportaccessvlan4!

interfaceFastEthernet6/15switchportaccessvlan4!

interfaceFastEthernet6/16switchportaccessvlan4!

interfaceFastEthernet6/17switchportaccessvlan4!

interfaceFastEthernet6/18switchportaccessvlan4!

interfaceFastEthernet6/19switchportaccessvlan4!

interfaceFastEthernet6/20switchportaccessvlan4!

interfaceFastEthernet6/21switchportaccessvlan4!

interfaceFastEthernet6/22switchportaccessvlan4!

interfaceFastEthernet6/23switchportaccessvlan4!

interfaceFastEthernet6/24switchportaccessvlan4!

interfaceFastEthernet6/25switchportaccessvlan4!

interfaceFastEthernet6/26switchportaccessvlan4!

interfaceFastEthernet6/27switchportaccessvlan4!

interfaceFastEthernet6/28switchportaccessvlan2!

interfaceFastEthernet6/29switchportaccessvlan4!

interfaceFastEthernet6/30descriptionbeiyong-3switchportaccessvlan3!

interfaceFastEthernet6/31switchportaccessvlan3!

interfaceFastEthernet6/32switchportaccessvlan3!

interfaceFastEthernet6/33switchportaccessvlan3!

interfaceFastEthernet6/34switchportaccessvlan4!

interfaceFastEthernet6/35switchportaccessvlan3!

interfaceFastEthernet6/36switchportaccessvlan3!

interfaceFastEthernet6/37switchportaccessvlan3!

interfaceFastEthernet6/38switchportaccessvlan3!

interfaceFastEthernet6/39switchportaccessvlan3!

interfaceFastEthernet6/40switchportaccessvlan3!

interfaceFastEthernet6/41switchportaccessvlan3!

interfaceFastEthernet6/42switchportaccessvlan3!

interfaceFastEthernet6/43switchportaccessvlan3!

interfaceFastEthernet6/44switchportaccessvlan3!

interfaceFastEthernet6/45descriptiontuoliuswitchportaccessvlan3!

interfaceFastEthernet6/46descriptiontuoliuswitchportaccessvlan3!

interfaceFastEthernet6/47desc