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.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
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