Procedure

1. Run system-view

   The system view is displayed.

2. (For the CE16800 equipped with G/GK series cards) Run m-lag forward layer-3 enhanced enable

   Enhanced M-LAG Layer 3 forwarding is enabled.

   By default, enhanced M-LAG Layer 3 forwarding is disabled.

   After enhanced M-LAG Layer 3 forwarding is enabled, backup FRR resources are requested for all ARP and ND entries with M-LAG member interfaces as outbound interfaces. The outbound interfaces can be changed to peer-link interfaces to establish active and standby paths for traffic forwarding. If the FEI side detects that an M-LAG member interface fails, dual-homing networking is changed to single-homing networking. The next hop in the corresponding ARP or ND entry is changed from the M-LAG member interface to the peer-link interface. This improves the switchover performance when faults occur.

   • After enhanced M-LAG route convergence is enabled, you can disable this function only after 300s. After enhanced M-LAG route convergence is disabled, you can enable this function only after 300s.
   • You can configure this command in the Admin-VS only.
   • After enhanced M-LAG route convergence is enabled, the active and standby paths may fail to be delivered due to increased next-hop resource consumption. As a result, packet loss occurs.
   • After enhanced M-LAG route convergence is enabled, the MAC addresses of VLANIF interfaces and VBDIF interfaces on the two M-LAG member devices must be the same.
   • In an M-LAG scenario where devices in the M-LAG are upgraded and replaced with devices of different models, if enhanced M-LAG route convergence has been enabled before the upgrade, disable enhanced M-LAG route convergence and enhanced M-LAG Layer 3 forwarding, and then perform the upgrade and replacement operations.
   • In VXLAN scenarios, only on the CE16800 equipped with G/GK series cards support enhanced M-LAG Layer 3 forwarding, to use enhanced M-LAG Layer 3 forwarding in an IPv4 scenario, you also need to run the arp broadcast-detect enable command.

3. (For the CE16800 equipped with A series cards) Run one of the following commands based on the device type:

   m-lag forward layer-3 { ipv4 | ipv6 } enhanced enable

   Enhanced M-LAG Layer 3 forwarding is enabled in an IPv6 scenario.

   By default, enhanced M-LAG Layer 3 forwarding is disabled.

   After enhanced M-LAG Layer 3 forwarding is enabled, backup FRR resources are requested for all ARP and ND entries with M-LAG member interfaces as outbound interfaces. This allows active and standby paths to be established for traffic forwarding and outbound interfaces to be changed to peer-link interfaces. If the FEI side detects that an M-LAG member interface fails, dual-homing networking is changed to single-homing networking. The next hop in the corresponding ARP or ND entry is changed from the M-LAG member interface to the peer-link interface. This improves the switchover performance when faults occur.

   • After enhanced M-LAG Layer 3 forwarding is enabled, the active and standby paths may fail to be delivered due to increased next-hop resource consumption. As a result, packet loss occurs.
   • After enhanced M-LAG Layer 3 forwarding is enabled, you need to configure an Eth-Trunk interface to clear all the learned ARP and ND entries when the Eth-Trunk joining in or being removed from M-LAG. This prevents the upper-layer protocol module from detecting the waste of FRR resources caused by the change of M-LAG member interfaces.
   • After enhanced M-LAG Layer 3 forwarding is enabled, you can disable this function only after 300s. After enhanced M-LAG Layer 3 forwarding is disabled, you can enable this function only after 300s.
   • You can configure this command in the Admin-VS only, and the configuration takes effect for the entire device.
   • In VXLAN scenarios, to use enhanced M-LAG Layer 3 forwarding in an IPv4 scenario, you also need to run the arp broadcast-detect enable command.
   • The enhanced M-LAG Layer 3 forwarding function takes effect only in scenarios where virtual MAC addresses are statically configured for M-LAG dual-active gateways.
   • When enabling the enhanced Layer 3 forwarding function in an M-LAG, enable the function on both member devices in the M-LAG.

4. Run m-lag forward route convergence enhanced enable

   Enhanced M-LAG route convergence is enabled in IPv4 and IPv6 scenarios.

   By default, enhanced M-LAG route convergence is disabled in IPv4 and IPv6 scenarios.

   • Before enabling enhanced M-LAG route convergence, run the m-lag forward layer-3 enhanced enable command to enable enhanced M-LAG Layer 3 forwarding. Before disabling enhanced M-LAG Layer 3 forwarding, run the undo m-lag forward route convergence enhanced enable command to disable enhanced M-LAG route convergence.
   • After enhanced M-LAG route convergence is enabled, the active and standby paths may fail to be delivered due to increased next-hop resource consumption. As a result, packet loss occurs.
   • After enhanced M-LAG route convergence is enabled, you can disable this function only after 300s. After enhanced M-LAG route convergence is disabled, you can enable this function only after 300s.
   • You can configure this command in the Admin-VS only, and the configuration takes effect for the entire device.
   • After enhanced M-LAG route convergence is enabled, the MAC addresses of VLANIF interfaces and VBDIF interfaces on the two M-LAG member devices must be the same.
   • In an M-LAG scenario where devices in the M-LAG are upgraded and replaced with devices of different models, if enhanced M-LAG route convergence has been enabled before the upgrade, disable enhanced M-LAG route convergence and enhanced M-LAG Layer 3 forwarding, and then perform the upgrade and replacement operations.
   • Only on the CE16800 equipped with G/GK series cards support the enhanced M-LAG route convergence.

5. Run commit

   The configuration is committed.