关于vxlan实验，隧道起不来，状态是down,啥情况？

做vxlan实验，做完后隧道起不来，状态是down.

组网要求：

R1、R2、R3为与服务器连接的VTEP设备。虚拟机VM 1、VM 2和VM 3同属于VXLAN 10。通过VXLAN实现不同站点间的二层互联，确保虚拟机在站点之间进行迁移时用户的访问流量不会中断。

具体需求为：

·不同VTEP之间手工建立VXLAN隧道。

·手工关联VXLAN和VXLAN隧道。

·通过源MAC地址动态学习远端MAC地址表项。

·站点之间的泛洪流量采用头端复制的方式转发。

相关配置：

R1

system-view

interface LoopBack0

ip address 1.1.1.1 255.255.255.255

interface GigabitEthernet0/1

ip address 14.1.1.1 255.255.255.0

ospf 1 router-id 1.1.1.1

area 0.0.0.0

network 1.1.1.1 0.0.0.0

network 14.1.1.0 0.0.0.255

R2

system-view

interface LoopBack0

ip address 2.2.2.2 255.255.255.255

interface GigabitEthernet0/1

ip address 24.1.1.2 255.255.255.0

ospf 1 router-id 2.2.2.2

area 0.0.0.0

network 2.2.2.2 0.0.0.0

network 24.1.1.0 0.0.0.255

R3

system-view

interface LoopBack0

ip address 3.3.3.3 255.255.255.255

interface GigabitEthernet0/1

ip address 34.1.1.3 255.255.255.0

ospf 1 router-id 3.3.3.3

area 0.0.0.0

network 3.3.3.3 0.0.0.0

network 34.1.1.0 0.0.0.255

R4

system-view

interface LoopBack0

ip address 4.4.4.4 255.255.255.255

interface GigabitEthernet0/0

ip address 14.1.1.4 255.255.255.0

interface GigabitEthernet0/1

ip address 24.1.1.4 255.255.255.0

interface GigabitEthernet0/2

ip address 34.1.1.4 255.255.255.0

ospf 1 router-id 4.4.4.4

area 0.0.0.0

network 4.4.4.4 0.0.0.0

network 14.1.1.0 0.0.0.255

network 24.1.1.0 0.0.0.255

network 34.1.1.0 0.0.0.255

配置VXLAN

R1

l2vpn enable  

interface Tunnel12 mode vxlan  

source 1.1.1.1

destination 2.2.2.2

interface Tunnel13 mode vxlan

source 1.1.1.1

destination 3.3.3.3

vsi vpna

vxlan 10

tunnel 12

tunnel 13

interface GigabitEthernet0/0

xconnect vsi vpna

R2

l2vpn enable

interface Tunnel21 mode vxlan

source 2.2.2.2

destination 1.1.1.1

interface Tunnel23 mode vxlan

source 2.2.2.2

destination 3.3.3.3

vsi vpna

vxlan 10

tunnel 21

tunnel 23

interface GigabitEthernet0/0

xconnect vsi vpna

R3

l2vpn enable

interface Tunnel31 mode vxlan

source 3.3.3.3

destination 1.1.1.1

interface Tunnel32 mode vxlan

source 3.3.3.3

destination 2.2.2.2

vsi vpna

vxlan 10

tunnel 31

tunnel 32

interface GigabitEthernet0/0

xconnect vsi vpna

VM1:192.168.1.1

VM2:192.168.1.2

VM3:192.168.1.3

pc1/pc2/pc3配置同网段IP测试。

ip地址根据设备号配置。

我在R1查看隧道状态如下：

[r1]dis interface Tunnel 12

 Tunnel12 Current state: DOWN Line protocol state: DOWN Description: 2.2.2.2 Bandwidth: 64 kbps Maximum transmission unit: 64000 Internet protocol processing: Disabled Output queue - Urgent queuing: Size/Length/Discards 0/1024/0 Output queue - Protocol queuing: Size/Length/Discards 0/500/0 Output queue - FIFO queuing: Size/Length/Discards 0/75/0 Last clearing of counters: Never Tunnel source 1.1.1.1, destination unknown Tunnel protocol/transport UDP_VXLAN/IP Last 300 seconds input rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec Last 300 seconds output rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec Input: 0 packets, 0 bytes, 0 drops Output: 0 packets, 0 bytes, 0 drops