Vxlan L2

VXLAN（Virtual eXtensible LAN可扩展虚拟局域网）诞生了，基于IP网络之上，采用的是MAC in UDP技术

跨三层实现二层通信

总结为何需要Vxlan：

1. 虚拟机规模受到网络规格的限制，大L2网络里，报文通过查询MAC地址转发，MAC表容量限制了虚拟机的数量。
2. 网络隔离的限制，普通的vlan和VPN配置无法满足动态网络调整的需求，同时配置复杂
3. 虚拟器搬迁受到限制，虚拟机启动后假如在业务不中断基础上将该虚拟机迁移到另外一台物理机上去，需要保持虚拟机的IP地址和MAC地址等参数保持不变，这就要求业务网络是一个二层的网络。

拓扑图:

交换机配置:

CE1

 <HUAWEI>display cu
 <HUAWEI>display current-configuration
 !Software Version V800R013C00SPC560B560
 !Last configuration was updated at -- ::+: by SYSTEM automatic
 ally
 !Last configuration was saved at -- ::+:
 #
 sysname HUAWEI
 #
 device board  board-type CE-MPUB
 device board  board-type CE-LPUE
 #
 aaa
  #
  authentication-scheme default
  #
  authorization-scheme default
  #
  accounting-scheme default
  #
  domain default
  #
  domain default_admin
 #
 interface MEth0//
  undo shutdown
 #
 interface GE1//
  undo portswitch
  undo shutdown
  ip address 10.12.0.1 255.255.255.0
 #
 interface GE1//
  undo portswitch
  undo shutdown
  ip address 10.13.0.1 255.255.255.0
 #
 interface GE1//
  shutdown
 #
 interface GE1//
  shutdown
 #
 interface GE1//
  shutdown
 #
 interface GE1//
  shutdown
 #
 interface GE1//
  shutdown
 #
 interface GE1//
  shutdown
 #
 interface GE1//
  shutdown
 #
 interface GE1//
  shutdown
 #
 interface NULL0
 #
 ospf
  area 0.0.0.0
   network 10.12.0.0 0.0.0.255
   network 10.13.0.0 0.0.0.255
 #
 ssh authorization-type default aaa
 #
 user-interface con
 #
 vm-manager
 #
 return

CE2

 <HUAWEI>display current-configuration
 !Software Version V800R013C00SPC560B560
 !Last configuration was updated at -- ::+:
 !Last configuration was saved at -- ::+:
 #
 sysname HUAWEI
 #
 device board  board-type CE-MPUB
 device board  board-type CE-LPUE
 #
 vlan batch
 #
 bridge-domain
  vxlan vni
 #
 aaa
  #
  authentication-scheme default
  #
  authorization-scheme default
  #
  accounting-scheme default
  #
  domain default
  #
  domain default_admin
 #
 interface Vlanif10
  ip address 1.1.1.254 255.255.255.0
 #
 interface MEth0//
  undo shutdown
 #
 interface GE1//
  undo shutdown
  port link-type trunk
 #
 interface GE1//0.1 mode l2
  encapsulation dot1q vid
  bridge-domain
 #
 interface GE1//
  undo portswitch
  undo shutdown
  ip address 10.12.0.2 255.255.255.0
 #
 interface GE1//
  shutdown
 #
 interface GE1//
  shutdown
 #
 interface GE1//
  shutdown
 #
 interface GE1//
  shutdown
 #
 interface GE1//
  shutdown
 #
 interface GE1//
  shutdown
 #
 interface GE1//
  shutdown
 #
 interface GE1//
  shutdown
 #
 interface LoopBack0
  ip address 10.2.2.2 255.255.255.255
 #
 interface Nve1
  source 10.2.2.2
  vni  head-end peer-list 10.3.3.3
 #
 interface NULL0
 #
 ospf
  area 0.0.0.0
   network 10.2.2.2 0.0.0.0
   network 10.12.0.0 0.0.0.255
 #
 ssh authorization-type default aaa
 #
 user-interface con
 #
 vm-manager
 #
 return

CE3

 <HUAWEI>display current-configuration
 !Software Version V800R013C00SPC560B560
 !Last configuration was updated at -- ::+: by SYSTEM automatic
 ally
 !Last configuration was saved at -- ::+:
 #
 sysname HUAWEI
 #
 device board  board-type CE-MPUB
 device board  board-type CE-LPUE
 #
 vlan batch
 #
 bridge-domain
  vxlan vni
 #
 aaa
  #
  authentication-scheme default
  #
  authorization-scheme default
  #
  accounting-scheme default
  #
  domain default
  #
  domain default_admin
 #
 interface MEth0//
  undo shutdown
 #
 interface GE1//
  undo portswitch
  undo shutdown
  ip address 10.13.0.3 255.255.255.0
 #
 interface GE1//
  undo shutdown
  port link-type trunk
 #
 interface GE1//1.1 mode l2
  encapsulation dot1q vid
  bridge-domain
 #
 interface GE1//
  shutdown
 #
 interface GE1//
  shutdown
 #
 interface GE1//
  shutdown
 #
 interface GE1//
  shutdown
 #
 interface GE1//
  shutdown
 #
 interface GE1//
  shutdown
 #
 interface GE1//
  shutdown
 #
 interface GE1//
  shutdown
 #
 interface LoopBack0
  ip address 10.3.3.3 255.255.255.255
 #
 interface Nve1
  source 10.3.3.3
  vni  head-end peer-list 10.2.2.2
 #
 interface NULL0
 #
 ospf
  area 0.0.0.0
   network 10.3.3.3 0.0.0.0
   network 10.13.0.0 0.0.0.255
 #
 ssh authorization-type default aaa
 #
 user-interface con
 #
 vm-manager
 #
 return

LSW1

 #
 vlan batch
 #
 interface GigabitEthernet0//
  port link-type trunk
  port trunk allow-pass vlan
 #
 interface GigabitEthernet0//
  port link-type access
  port default vlan
 #

LSW2

 #
 vlan batch
 #
 interface GigabitEthernet0//
  port link-type trunk
  port trunk allow-pass vlan
 #
 interface GigabitEthernet0//
  port link-type access
  port default vlan 

PC1 PING PC2 验证: