1.3 BGP EVPN方式集中式网关同VXLAN互访

1.CE1开启EVPN，配置BGP协议

[~CE1]evpn-overlay enable 
[*CE1]bgp 100
[*CE1-bgp]peer 2.2.2.2 as-number 100
[*CE1-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[*CE1-bgp]l2vpn-family evpn 
[*CE1-bgp-af-evpn]peer 2.2.2.2 enable 

2.CE2开启EVPN，配置BGP协议

[~CE2]evpn-overlay enable
[*CE2]bgp 100
[*CE2-bgp]peer 1.1.1.1 as-number 100
[*CE2-bgp]peer 1.1.1.1 connect-interface LoopBack 0
[*CE2-bgp]l2vpn-family evpn
[*CE2-bgp-af-evpn]peer 1.1.1.1 enable 

3.CE1配置BD域，创建业务接入点，放入不同域中

[*CE1]bridge-domain 10
[*CE1-bd10]vxlan vni 10
[*CE1-bd10]evpn 
[*CE1-bd10-evpn]route-distinguisher 100:10
[*CE1-bd10-evpn]vpn-target 100:10

[*CE1]bridge-domain 20
[*CE1-bd20]vxlan vni 20
[*CE1-bd20]evpn
[*CE1-bd20-evpn]route-distinguisher 100:20
[*CE1-bd20-evpn]vpn-target 100:20

[*CE1]interface GE 1/0/0
[*CE1-GE1/0/0]undo shutdown 
[*CE1]interface GE 1/0/0.10 mode l2 
[*CE1-GE1/0/0.10]encapsulation dot1q vid 10
[*CE1-GE1/0/0.10]bridge-domain 10
[*CE1]interface GE 1/0/0.20  mode l2
[*CE1-GE1/0/0.20]encapsulation dot1q vid 20
[*CE1-GE1/0/0.20]bridge-domain 20

4.CE2配置BD域，创建业务接入点，放入不同域中

[*CE2]bridge-domain 10
[*CE2-bd10]vxlan vni 10
[*CE2-bd10]evpn
[*CE2-bd10-evpn]route-distinguisher 100:10
[*CE2-bd10-evpn]vpn-target 100:10

[*CE2]bridge-domain 20
[*CE2-bd20]vxlan vni 20
[*CE2-bd20]evpn
[*CE2-bd20-evpn]route-distinguisher 100:20
[*CE2-bd20-evpn]vpn-target 100:20

[*CE2]interface GE 1/0/0
[*CE2-GE1/0/0]undo shutdown 
[*CE2-GE1/0/0]q
[*CE2]interface GE 1/0/0.10 mode l2
[*CE2-GE1/0/0.10]encapsulation dot1q vid 10
[*CE2-GE1/0/0.10]bridge-domain 10
[*CE2]interface GE 1/0/0.20  mode l2
[*CE2-GE1/0/0.20]encapsulation dot1q vid 20
[*CE2-GE1/0/0.20]bridge-domain 20

5.CE1配置VXLAN隧道

[*CE1]interface Nve 1
[*CE1-Nve1]source 1.1.1.1
[*CE1-Nve1]vni 10 head-end peer-list protocol bgp 
[*CE1-Nve1]vni 20 head-end peer-list protocol bgp 
[*CE1]commit

6.CE2配置VXLAN隧道

[*CE2]interface Nve 1
[*CE2-Nve1]source 2.2.2.2
[*CE2-Nve1]vni 10 head-end peer-list protocol bgp
[*CE2-Nve1]vni 20 head-end peer-list protocol bgp
[*CE2]commit

7.CE1、CE2、CE3的OSPF配置，SW1、SW2配置同上