segment概念：
segment方案是在需要互联的两个DCI间建立3条VXLAN隧道实现两个DCI间的二层和三层间互通需求，常用于大型的DCI间互联，无需考虑两个DCI内的VXLAN参数规划的不同，其中二层互通可以采用映射VNI或局部VNI的方式进行解决，华为推荐映射VNI方式。
实验拓扑
1、地址编码如图所示，underlay选用OSPF跑通底层互联地址以及环回口地址；
2、AS内采用IBGP EVPN传输EVPN路由，AS间采用EBGP EVPN传递DCI间的EVPN路由。
配置
leaf1
evpn-overlay enable //开启EVPN支持能力
bridge-domain 1000 //配置BD域
vxlan vni 5010
evpn
route-distinguisher 1:1
vpn-target 5010:1 export-extcommunity
vpn-target 11:1 export-extcommunity
vpn-target 5010:1 import-extcommunity
vpn-target 11:1 import-extcommunity
interface GE1/0/8.100 mode l2 //配置业务接入点
encapsulation dot1q vid 100
bridge-domain 1000
ip vpn-instance A //配置VRF
ipv4-family
route-distinguisher 11:11
vpn-target 11:1 export-extcommunity evpn
vpn-target 11:1 import-extcommunity evpn
vxlan vni 3000
interface Vbdif1000 //配置分布式网关
ip binding vpn-instance A
ip address 192.168.1.254 255.255.255.0
mac-address 0000-5e00-0011
vxlan anycast-gateway enable
arp collect host enable
bgp 100 //配置BGP EVPNrouter-id 11.11.11.11
undo default ipv4-unicast
peer 22.22.22.22 as-number 100
peer 22.22.22.22 connect-interface LoopBack1
ipv4-family unicast
undo peer 22.22.22.22 enable
l2vpn-family evpn
policy vpn-target
peer 22.22.22.22 enable
peer 22.22.22.22 advertise irb
interface Nve1 //配置NVE接口
source 1.1.1.1
vni 5010 head-end peer-list protocol bgp
spine1
evpn-overlay enable
bgp 100 //配置BGP EVNP 作为RR反射路由
router-id 22.22.22.22
undo default ipv4-unicast
peer 11.11.11.11 as-number 100
peer 11.11.11.11 connect-interface LoopBack1
peer 33.33.33.33 as-number 100
peer 33.33.33.33 connect-interface LoopBack1
ipv4-family unicast
undo peer 11.11.11.11 enable
undo peer 33.33.33.33 enable
l2vpn-family evpn
undo policy vpn-target
peer 11.11.11.11 enable
peer 11.11.11.11 advertise irb
peer 11.11.11.11 reflect-client
peer 33.33.33.33 enable
peer 33.33.33.33 advertise irb
peer 33.33.33.33 reflect-client
dci1
evpn-overlay enable
ip vpn-instance A //配置VRF 绑定VXLAN VNI 进行调用
ipv4-family
route-distinguisher 33:33
vpn-target 11:1 export-extcommunity evpn
vpn-target 10:10 export-extcommunity evpn
vpn-target 11:1 import-extcommunity evpn
vpn-target 10:10 import-extcommunity evpn
vxlan vni 3000
bridge-domain 1000 //配置BD域 并配置水平分割功能 映射VNI实现二层互通
vxlan vni 5000 split-group sg1
vxlan vni 5010
evpn
route-distinguisher 3:3
vpn-target 5010:1 export-extcommunity
vpn-target 50:50 export-extcommunity
vpn-target 5010:1 import-extcommunity
vpn-target 50:50 import-extcommunity
bgp 100 //配置BGP EVPN 实现路由重生功能router-id 33.33.33.33
undo default ipv4-unicast
peer 22.22.22.22 as-number 100
peer 22.22.22.22 connect-interface LoopBack1
peer 44.44.44.44 as-number 200
peer 44.44.44.44 ebgp-max-hop 255
peer 44.44.44.44 connect-interface LoopBack1
ipv4-family unicast
undo peer 22.22.22.22 enable
undo peer 44.44.44.44 enable
l2vpn-family evpn
policy vpn-target
peer 22.22.22.22 enable
peer 22.22.22.22 advertise irb
peer 22.22.22.22 import reoriginate
peer 22.22.22.22 advertise route-reoriginated evpn mac-ip
peer 22.22.22.22 advertise route-reoriginated evpn mac
peer 22.22.22.22 advertise route-reoriginated evpn ip
peer 44.44.44.44 enable
peer 44.44.44.44 advertise irb
peer 44.44.44.44 split-group sg1
peer 44.44.44.44 import reoriginate
peer 44.44.44.44 advertise route-reoriginated evpn mac-ip
peer 44.44.44.44 advertise route-reoriginated evpn mac
peer 44.44.44.44 advertise route-reoriginated evpn ip
interface Nve1 //配置NVE接口
source 4.4.4.4
vni 5000 head-end peer-list protocol bgp
vni 5011 head-end peer-list protocol bgp
dci2
evpn-overlay enable
ip vpn-instance B //配置VRF
ipv4-family
route-distinguisher 44:44
vpn-target 22:2 export-extcommunity evpn
vpn-target 10:10 export-extcommunity evpn
vpn-target 22:2 import-extcommunity evpn
vpn-target 10:10 import-extcommunity evpn
vxlan vni 4000
bridge-domain 1000 //配置BD域
vxlan vni 5000 split-group sg1
vxlan vni 5011
evpn
route-distinguisher 444:444
vpn-target 5011:1 export-extcommunity
vpn-target 50:50 export-extcommunity
vpn-target 5011:1 import-extcommunity
vpn-target 50:50 import-extcommunity
bgp 200 //BGP配置，与dci1同理router-id 44.44.44.44
undo default ipv4-unicast
peer 33.33.33.33 as-number 100
peer 33.33.33.33 ebgp-max-hop 255
peer 33.33.33.33 connect-interface LoopBack1
peer 55.55.55.55 as-number 200
peer 55.55.55.55 connect-interface LoopBack1
ipv4-family unicast
undo peer 33.33.33.33 enable
undo peer 55.55.55.55 enable
l2vpn-family evpn
policy vpn-target
peer 33.33.33.33 enable
peer 33.33.33.33 advertise irb
peer 33.33.33.33 split-group sg1
peer 33.33.33.33 import reoriginate
peer 33.33.33.33 advertise route-reoriginated evpn mac-ip
peer 33.33.33.33 advertise route-reoriginated evpn mac
peer 33.33.33.33 advertise route-reoriginated evpn ip
peer 55.55.55.55 enable
peer 55.55.55.55 advertise irb
peer 55.55.55.55 import reoriginate
peer 55.55.55.55 advertise route-reoriginated evpn mac-ip
peer 55.55.55.55 advertise route-reoriginated evpn mac
peer 55.55.55.55 advertise route-reoriginated evpn ip
spine2
evpn-overlay enable
bgp 200
router-id 55.55.55.55
undo default ipv4-unicast
peer 44.44.44.44 as-number 200
peer 44.44.44.44 connect-interface LoopBack1
peer 66.66.66.66 as-number 200
peer 66.66.66.66 connect-interface LoopBack1
ipv4-family unicast
undo peer 44.44.44.44 enable
undo peer 66.66.66.66 enable
l2vpn-family evpn
undo policy vpn-target
peer 44.44.44.44 enable
peer 44.44.44.44 advertise irb
peer 44.44.44.44 reflect-client
peer 66.66.66.66 enable
peer 66.66.66.66 advertise irb
peer 66.66.66.66 reflect-client
leaf2
evpn-overlay enable
bridge-domain 1000 //BD域配置
vxlan vni 5011
evpn
route-distinguisher 20:20
vpn-target 5011:1 export-extcommunity
vpn-target 11:11 export-extcommunity
vpn-target 5011:1 import-extcommunity
vpn-target 11:11 import-extcommunity
bridge-domain 2000
vxlan vni 5020
evpn
route-distinguisher 6:6
vpn-target 5020:1 export-extcommunity
vpn-target 22:2 export-extcommunity
vpn-target 5020:1 import-extcommunity
vpn-target 22:2 import-extcommunity
interface GE1/0/8.100 mode l2 //业务接入点配置
encapsulation dot1q vid 100
bridge-domain 1000
interface GE1/0/8.200 mode l2
encapsulation dot1q vid 200
bridge-domain 2000
ip vpn-instance A //VRF配置
ipv4-family
route-distinguisher 202:202
vpn-target 11:11 export-extcommunity evpn
vpn-target 11:11 import-extcommunity evpn
vxlan vni 3001
ip vpn-instance B
ipv4-family
route-distinguisher 66:66
vpn-target 22:2 export-extcommunity evpn
vpn-target 22:2 import-extcommunity evpn
vxlan vni 4000
interface Vbdif1000 //分部式网关配置
ip binding vpn-instance A
ip address 192.168.1.254 255.255.255.0
mac-address 0000-5e00-0011
vxlan anycast-gateway enable
arp collect host enable
interface Vbdif2000
ip binding vpn-instance B
ip address 192.168.2.254 255.255.255.0
mac-address 0000-5e00-0066
vxlan anycast-gateway enable
arp collect host enable
bgp 200 //BGP配置
router-id 66.66.66.66
undo default ipv4-unicast
peer 55.55.55.55 as-number 200
peer 55.55.55.55 connect-interface LoopBack1
ipv4-family unicast
undo peer 55.55.55.55 enable
l2vpn-family evpn
policy vpn-target
peer 55.55.55.55 enable
peer 55.55.55.55 advertise irb
状态查看
evpn邻居状态
在spine1上查看
在dci1上查看
EVPN路由查看
在leaf1上：
注意ENSP模拟器有BUG是不产生type2 的MAC路由的所以二层互通是无法在ENSP进行模拟的
可以看到PC1的主机MAC为54-89-98-63-13-6D，本地的MAC表中可以看到，但是并未进入到EVPN路由中进行传输，真机测试后是正常进入的。
测试
在PC1上Ping测试PC2
