基于思科组播的VXLAN基本配置
基于思科组播的VXLAN基本配置图一：目的：基于组播的VXLAN基本配置，实现overlay网络夸三层的二层互通。
基础配置接口配置：
Spine(config)#interface loopback 0
Spine(config-if)#ip address10.0.0.1 255.255.255.255
Spine(config)#interface gigabitEthernet 0/1
Spine(config-if)#ip address 10.0.13.1 255.255.255.0
Spine(config)#interface gigabitEthernet 0/4
Spine(config-if)#ip address 10.0.14.1 255.255.255.0
Spine(config)#interface gigabitEthernet 0/5
Spine(config-if)#ip address 10.0.15.1 255.255.255.0
N9K-VTEP1(config)# interface ethernet 1/4
N9K-VTEP1(config-if)# ipaddress 10.0.13.3/24
N9K-VTEP1(config)# interface loopback 0
N9K-VTEP1(config-if)# ip address 10.0.0.13/32
N9K-VTEP3(config)# interface ethernet 1/2
N9K-VTEP3(config-if)# ip address 10.0.15.5/24
N9K-VTEP3(config)# interface loopback 0
N9K-VTEP3(config-if)# ip address 10.0.0.15/32
启用IGP配置：
Spine(config)#router ospf 110
Spine(config-router)#router-id 10.0.0.1
Spine(config-router)#network 10.0.0.1 0.0.0.0 a 0
Spine(config-router)#network 10.0.13.0 0.0.0.255 a 0
Spine(config-router)#network 10.0.14.0 0.0.0.255 a 0
Spine(config-router)#network 10.0.15.0 0.0.0.255 a 0
N9K-VTEP1(config)#feature ospf
N9K-VTEP1(config)# router ospf 110
N9K-VTEP1(config-router)#router-id 10.0.0.13
N9K-VTEP1(config)# interface ethernet 1/4
N9K-VTEP1(config-if)# ip router ospf 110 area 0
N9K-VTEP1(config)# interface loopback 0
N9K-VTEP1(config-if)# iprouter ospf 110 area 0
N9K-VTEP3(config)# feature ospf
N9K-VTEP3(config)# router ospf 110
N9K-VTEP3(config-router)#router-id 10.0.0.15
N9K-VTEP3(config)# interface ethernet 1/2
N9K-VTEP3(config-if)# ip router ospf 110 area 0
N9K-VTEP3(config)# interface loopback 0
N9K-VTEP3(config-if)# ip router ospf 110 area 0
启用组播配置，Spine为组播RP：
Spine(config)#ip multicast-routing
Spine(config)#ip pim bidir-enable
Spine(config)#ip pim rp-address 10.0.0.1 1 bidir
Spine(config)#access-list 1 permit 225.0.0.0 0.0.0.255
Spine(config)#interface loopback 0
Spine(config-if)#ip pim sparse-mode
Spine(config)#interface gigabitEthernet 0/1
Spine(config-if)#ip pim sparse-mode
Spine(config)#interface gigabitEthernet 0/4
Spine(config-if)#ip pim sparse-mode
Spine(config)#interface gigabitEthernet 0/5
Spine(config-if)#ip pim sparse-mode
N9K-VTEP1(config)#feature pim
N9K-VTEP1(config)# ip pim rp-address 10.0.0.1 group-list 225.0.0.0/24 bidir
N9K-VTEP1(config)# interface ethernet 1/4
N9K-VTEP1(config-if)# ip pim sparse-mode
N9K-VTEP1(config)# interface loopback 0
N9K-VTEP1(config-if)# ip pim sparse-mode
N9K-VTEP3(config)#feature pim
N9K-VTEP3(config)# ip pim rp-address 10.0.0.1 group-list 225.0.0.0/24 bidir
N9K-VTEP3(config)# interface ethernet 1/2
N9K-VTEP3(config-if)# ip pim sparse-mode
N9K-VTEP3(config)# interface loopback 0
N9K-VTEP3(config-if)# ip pim sparse-mode
VXLAN配置VXLAN配置：
N9K-VTEP3(config)# feature nv overlay
N9K-VTEP3(config)# feature vn-segment-vlan-based
N9K-VTEP3(config)# vlan 101
N9K-VTEP3(config-vlan)#vn-segment 10101
N9K-VTEP3(config)# interface ethernet 1/3
N9K-VTEP3(config-if)#switchport access vlan 101
N9K-VTEP3(config)# interface nve 1
N9K-VTEP3(config-if-nve)#source-interface loopback 0
N9K-VTEP3(config-if-nve)#member vni 10101 mcast-group 225.0.0.101
N9K-VTEP1(config)# feature nv overlay
N9K-VTEP1(config)# feature vn-segment-vlan-based
N9K-VTEP1(config)# vlan 101
N9K-VTEP1(config-vlan)#vn-segment 10101
N9K-VTEP1(config)# interface ethernet 1/5
N9K-VTEP1(config-if)#switchport mode access
N9K-VTEP1(config-if)#switchport access vlan 101
N9K-VTEP1(config)# interface nve 1
N9K-VTEP1(config-if-nve)#source-interface loopback 0
N9K-VTEP1(config-if-nve)#member vni 10101 mcast-group 225.0.0.101
查看协议状态：
N9K-VTEP1# show ip pim neighbor PIM Neighbor Status for VRF "default"
Neighbor Interface Uptime Expires DR Bidir- BFD Priority CapableState
10.0.13.1 Ethernet1/4 01:29:47 00:01:44 1 yes n/a
N9K-VTEP1# show ip mroute
IP Multicast Routing Table for VRF "default"
(*, 225.0.0.0/24), bidir, uptime: 01:31:16, pim ip
Incoming interface: Ethernet1/4, RPF nbr: 10.0.13.1, uptime: 01:31:16
Outgoing interface list: (count: 1)
Ethernet1/4, uptime: 01:31:16, pim, (RPF)
(*, 225.0.0.101/32), bidir, uptime: 00:26:37, nve ip pim
Incoming interface: Ethernet1/4, RPF nbr: 10.0.13.1, uptime: 00:26:37
Outgoing interface list: (count: 2)
Ethernet1/4, uptime: 00:26:37, pim, (RPF)
nve1, uptime: 00:26:37, nve
(10.0.0.13/32, 225.0.0.101/32), bidir, uptime: 00:26:37, nve ip mrib
Incoming interface: loopback0, RPF nbr: 10.0.0.13, uptime: 00:26:37
Outgoing interface list: (count: 1)
nve1, uptime: 00:26:37, nve
(*, 225.0.0.102/32), bidir, uptime: 00:26:37, nve ip pim
Incoming interface: Ethernet1/4, RPF nbr: 10.0.13.1, uptime: 00:26:37
Outgoing interface list: (count: 2)
Ethernet1/4, uptime: 00:26:37, pim, (RPF)
nve1, uptime: 00:26:37, nve
(10.0.0.13/32, 225.0.0.102/32), bidir, uptime: 00:26:37, nve ip mrib
Incoming interface: loopback0, RPF nbr: 10.0.0.13, uptime: 00:26:37
Outgoing interface list: (count: 1)
nve1, uptime: 00:26:37, nve
(*, 232.0.0.0/8), uptime: 01:32:11, pim ip
Incoming interface: Null, RPF nbr: 0.0.0.0, uptime: 01:32:11
Outgoing interface list: (count: 0
N9K-VTEP1# show interface nve 1 brief
--------------------------------------------------------------------------------
Port Status Reason MTU
--------------------------------------------------------------------------------
nve1 up none 9216
测试结果：
VPCS> ping 192.168.101.3
84 bytes from 192.168.101.3 icmp_seq=1 ttl=64 time=39.603 ms
84 bytes from 192.168.101.3 icmp_seq=2 ttl=64 time=46.926 ms
84 bytes from 192.168.101.3 icmp_seq=3 ttl=64 time=36.462 ms
84 bytes from 192.168.101.3 icmp_seq=4 ttl=64 time=33.530 ms
84 bytes from 192.168.101.3 icmp_seq=5 ttl=64 time=39.559 ms
数据格式封装：
VXLAN基本原理为MAC-IN-UDP。数据在overlay网络中必须在原始报文上添加外层报文，实现overlay网络穿越。
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