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

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。

UserAccessVerification

Password:

3550-bg>en

Password:

3550-bg#showrun

Buildingconfiguration...

Currentconfiguration:

5028bytes

!

version12.2

noservicepad

servicetimestampsdebuguptime

servicetimestampsloguptime

servicepassword-encryption

!

hostname3550-bg

!

enablesecret5$1$TEZy$Z3dYM7Yz6p4tR4pfzj9O6.

enablepassword7094F471A1A0A

!

usernamecisco

noaaanew-model

systemmturouting1500

ipsubnet-zero

iprouting

!

!

!

!

nofileverifyauto

spanning-treemodepvst

spanning-treeextendsystem-id

!

vlaninternalallocationpolicyascending

!

interfaceFastEthernet0/1

descriptioninternet

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/2

descriptionguangyuwang

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/3

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/4

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/5

switchportaccessvlan3

switchportmodeaccess

!

interfaceFastEthernet0/6

descriptionshipinhuiyi

switchportaccessvlan3

switchportmodeaccess

!

interfaceFastEthernet0/7

descriptionBG-shebeibu

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/8

descriptionBG-chedui

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/9

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/10

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/11

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/12

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/13

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/14

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/15

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/16

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/17

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/18

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/19

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/20

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/21

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/22

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/23

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/24

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/25

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/26

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/27

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/28

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/29

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/30

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/31

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/32

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/33

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/34

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/35

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/36

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/37

switchportaccessvlan2

switchportmodeaccess

speed100

duplexfull

!

interfaceFastEthernet0/38

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/39

switchportaccessvlan2

switchportmodeaccess

speed100

duplexfull

!

interfaceFastEthernet0/40

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/41

switchportaccessvlan2

switchportmodeaccess

speed100

duplexfull

!

interfaceFastEthernet0/42

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/43

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/44

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/45

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/46

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/47

switchportaccessvlan2

switchportmodeaccess

!

interfaceFastEthernet0/48

descriptionHS-BG

switchporttrunkencapsulationdot1q

switchporttrunkallowedvlan2,3

switchportmodetrunk

!

interfaceGigabitEthernet0/1

descriptionHS-BG

switchporttrunkencapsulationisl

switchportmodetrunk

!

interfaceGigabitEthernet0/2

switchportmodedynamicdesirable

!

interfaceGigabitEthernet0/3

switchportmodedynamicdesirable

!

interfaceGigabitEthernet0/4

switchportmodedynamicdesirable

!

interfaceVlan1

descriptionguanli

ipaddress1.1.1.2255.255.255.0

!

ipclassless

iphttpserver

!

!

control-plane

!

!

linecon0

linevty04

password7094F471A1A0A

login

linevty515

login

!

!

monitorsession1sourceinterfaceFa0/1

end

3550-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-mis>en

Password:

4507-mis#showrun

Buildingconfiguration...

Currentconfiguration:

16281bytes

!

version12.2

noservicepad

servicetimestampsdebuguptime

servicetimestampsloguptime

servicepassword-encryption

servicecompress-config

noservicedhcp

!

hostname4507-mis

!

enablepassword7110A1016141D

!

usernamecisco

ipsubnet-zero

!

spanning-treemodepvst

spanning-treeextendsystem-id

powerredundancy-moderedundant

!

redundancy

moderpr

!

!

!

!

interfaceGigabitEthernet1/1

!

interfaceGigabitEthernet1/2

!

interfaceGigabitEthernet2/1

!

interfaceGigabitEthernet2/2

!

interfaceGigabitEthernet3/1

descriptionHS-JK

switchporttrunkencapsulationisl

switchportmodetrunk

!

interfaceGigabitEthernet3/2

descriptionHS-TX

switchporttrunkencapsulationisl

switchportmodetrunk

!

interfaceGigabitEthernet3/3

descriptionHS-BG

switchporttrunkallowedvlan2

switchporttrunkallowedvlanadd3

switchporttrunkencapsulationdot1q

switchportmodetrunk

!

interfaceGigabitEthernet3/4

descriptionHS-SM-1

switchporttrunkencapsulationisl

switchportmodetrunk

!

interfaceGigabitEthernet3/5

descriptionHS-SM-2

switchportaccessvlan3

switchporttrunkencapsulationisl

switchportmodeaccess

!

interfaceGigabitEthernet3/6

switchportaccessvlan4

switchportmodeaccess

!

interfaceGigabitEthernet4/1

switchportaccessvlan4

switchportmodeaccess

ipaccess-group1in

!

interfaceGigabitEthernet4/2

switchportaccessvlan4

switchportmodeaccess

!

interfaceGigabitEthernet4/3

switchportaccessvlan4

switchportmodeaccess

!

interfaceGigabitEthernet4/4

switchportaccessvlan4

switchportmodeaccess

!

interfaceGigabitEthernet4/5

switchportaccessvlan4

switchportmodeaccess

!

interfaceGigabitEthernet4/6

switchportaccessvlan4

switchportmodeaccess

!

interfaceGigabitEthernet5/1

!

interfaceGigabitEthernet5/2

!

interfaceGigabitEthernet5/3

!

interfaceGigabitEthernet5/4

!

interfaceGigabitEthernet5/5

!

interfaceGigabitEthernet5/6

switchportaccessvlan4

switchportmodeaccess

!

interfaceFastEthernet6/1

descriptionSM

switchportaccessvlan3

switchportmodeaccess

!

interfaceFastEthernet6/2

descriptionsis

switchportaccessvlan3

!

interfaceFastEthernet6/3

switchportaccessvlan3

!

interfaceFastEthernet6/4

descriptionHS-BG

switchporttrunkencapsulationisl

switchportmodetrunk

!

interfaceFastEthernet6/5

switchportaccessvlan4

!

interfaceFastEthernet6/6

switchportaccessvlan4

!

interfaceFastEthernet6/7

description346-2

switchportaccessvlan4

!

interfaceFastEthernet6/8

switchportaccessvlan4

!

interfaceFastEthernet6/9

switchportaccessvlan4

!

interfaceFastEthernet6/10

switchportaccessvlan4

speed100

duplexfull

!

interfaceFastEthernet6/11

descriptionoa-server

switchportaccessvlan2

!

interfaceFastEthernet6/12

switchportaccessvlan4

!

interfaceFastEthernet6/13

switchportaccessvlan4

!

interfaceFastEthernet6/14

switchportaccessvlan4

!

interfaceFastEthernet6/15

switchportaccessvlan4

!

interfaceFastEthernet6/16

switchportaccessvlan4

!

interfaceFastEthernet6/17

switchportaccessvlan4

!

interfaceFastEthernet6/18

switchportaccessvlan4

!

interfaceFastEthernet6/19

switchportaccessvlan4

!

interfaceFastEthernet6/20

switchportaccessvlan4

!

interfaceFastEthernet6/21

switchportaccessvlan4

!

interfaceFastEthernet6/22

switchportaccessvlan4

!

interfaceFastEthernet6/23

switchportaccessvlan4

!

interfaceFastEthernet6/24

switchportaccessvlan4

!

interfaceFastEthernet6/25

switchportaccessvlan4

!

interfaceFastEthernet6/26

switchportaccessvlan4

!

interfaceFastEthernet6/27

switchportaccessvlan4

!

interfaceFastEthernet6/28

switchportaccessvlan2

!

interfaceFastEthernet6/29

switchportaccessvlan4

!

interfaceFastEthernet6/30

d