(Optional) Configuring a Layer 3 Gateway on the VXLAN

Procedure

1. Run system-view

   The system view is displayed.

2. Run interface vbdif bd-id

   A VBDIF interface is created, and the VBDIF interface view is displayed.

3. Run ip binding vpn-instance vpn-instance-name

   The VBDIF interface is bound to a VPN instance.

4. Configure an IP address for the VBDIF interface to implement Layer 3 communication.
   • For an IPv4 overlay network, run the ip address ip-address { mask | mask-length } [ sub ] command to configure an IPv4 address for the VBDIF interface.
   • For an IPv6 overlay network, perform the following operations:

     1. Run the ipv6 enable command to enable IPv6 for the VBDIF interface.

     2. Run the ipv6 address { ipv6-address prefix-length | ipv6-address/prefix-length } or ipv6 address { ipv6-address prefix-length | ipv6-address/prefix-length } eui-64 command to configure a global unicast address for the VBDIF interface.

5. (Optional) Run bandwidth bandwidth

   Bandwidth is configured for the VBDIF interface.

6. (Optional) Run mac-address mac-address

   A MAC address is configured for the VBDIF interface.

   By default, the MAC address of a VBDIF interface is the system MAC address. On a network where distributed or active-active Layer 3 gateways need to be simulated into one, you need to run the mac-address command to configure the same MAC address for the VBDIF interfaces of these Layer 3 gateways.

   

   If VMs on the same subnet connect to different Layer 3 gateways on a VXLAN, the VBDIF interfaces of the Layer 3 gateways must have the same IP address and same MAC address configured. In this way, the configurations of the Layer 3 gateways do not need to be changed when the VMs' locations are changed, reducing the maintenance workload.

7. Run vxlan anycast-gateway enable

   The distributed gateway function is enabled.

   

   After the distributed gateway function is enabled on a Layer 3 gateway, this gateway discards network-side ARP or NS messages and learns those only from the user side.

8. Perform one of the following steps to configure host route advertisement.

   Table 1 Configuring host route advertisement

   Overlay Network Type	Type of Route to Be Advertised Between Gateways	Host Route Advertisement Configuration
   IPv4	IRB route	Run the arp collect host enable command in the VBDIF interface view.
   	IP prefix route	Run the arp vlink-direct-route advertise [ route-policy route-policy-name | route-filter route-filter-name ] command in the IPv4 address family view of the VPN instance to which the VBDIF interface is bound.
   IPv6	IRB route	Run the ipv6 nd collect host enable command in the VBDIF interface view.
   	IP prefix route	Run the nd vlink-direct-route advertise [ route-policy route-policy-name | route-filter route-filter-name ] command in the IPv6 address family view of the VPN instance to which the VBDIF interface is bound.

9. Run commit

   The configuration is committed.