(Optional) Configuring the Dual-Active Gateway

Procedure

• Configure an IP address and a MAC address for a VLANIF/VBDIF interface to implement dual-active gateway.
  1. Run system-view

     The system view is displayed.

  2. Run interface { vlanif vlan-id | vbdif bd-id }

     The VLANIF or VBDIF interface view is displayed.

  3. Configure an IP address for the interface:
     • On IPv4 networks, run ip address ip-address { mask | mask-length } [ sub ]

       An IPv4 address is configured for the VLANIF/VBDIF interface.

     • On IPv6 networks, perform the following operations:

       1. Run ipv6 enable

          IPv6 is enabled for the VLANIF/VBDIF interface.

       2. Run ipv6 address { ipv6-address prefix-length | ipv6-address/prefix-length }

          Or run ipv6 address { ipv6-address prefix-length | ipv6-address/prefix-length } eui-64

          A global unicast address is configured for the VLANIF/VBDIF interface.

     An IP address is assigned to the VLANIF/VBDIF interface.

     By default, no IP address is configured for an interface.

     VLANIF/VBDIF interfaces corresponding to M-LAG member interfaces of M-LAG master and backup devices must be configured with the same IP address.

  4. Run mac-address (VLANIF interface view) mac-address

     Or run mac-address (VBDIF interface view) mac-address

     A virtual MAC address is configured for the VLANIF/VBDIF interface.

     By default, the MAC address of a VLANIF/VBDIF interface must be the same as the system MAC address.

     VLANIF/VBDIF interfaces corresponding to M-LAG member interfaces of M-LAG master and backup devices must be configured with the same virtual MAC address.

  5. (Optional) Run protocol up-delay-time time-value

     The delay before the Layer 3 protocol status of an interface can go Up is set.

     By default, the delay before the Layer 3 protocol status of a VLANIF interface can go Up is 1s. When there are many ARP entries, the delay is increased.

     When the faulty device or peer-link recovers, many ARP entries need to be synchronized in a batch. You can configure the delay so that the protocol status of the interface goes Up after ARP entries are synchronized. This prevents protocol packets from being discarded, reduces the packet loss during link recovery, and improves convergence performance.

     After a switch restarts or a card resets, the physical status of an interface changes to Up, but the upper-layer protocol modules do not meet forwarding requirements, resulting in packet loss. To ensure the revertive switching performance, the default delay for an M-LAG member interface to report the Up event is 240 seconds. If a delay after which the Layer 3 protocol status changes to Up is configured on a VLANIF interface, ensure that the delay for an M-LAG member interface to report the Up event is longer than the delay configured on the VLANIF interface. Otherwise, triggering of learning for ND entries that fail to be synchronized depends on ND Miss messages.

  6. Run commit

     The configuration is committed.

• 1. After a switch restarts or a card resets, the physical status of an interface changes to Up, but the upper-layer protocol modules do not meet forwarding requirements, resulting in packet loss. To ensure the revertive switching performance, the default delay for an M-LAG member interface to report the Up event is 240 seconds. If a delay after which the Layer 3 protocol status changes to Up is configured on a VLANIF interface, ensure that the delay for an M-LAG member interface to report the Up event is longer than the delay configured on the VLANIF interface. Otherwise, triggering of learning for ND entries that fail to be synchronized depends on ND Miss messages.