Improve DVLAN QinQ performance for NP7 platforms over virtual wire pairs

This information is also available in the FortiOS 7.4 Administration Guide: DVLAN QinQ on NP7 platforms over virtual wire pairs

DVLAN 802.1ad and 802.1Q modes are supported on NP7 platforms over virtual wire pairs, which provides better performance and packet processing.

The default DVLAN mode is 802.1ad, but the DVLAN mode can be changed using diagnose npu np7 dvlan-mode <dvlan_mode> {<npid> | all}. The DVLAN mode can be applied to a specific NPID or all NPIDs. For example:

• diagnose npu np7 dvlan-mode 802.1AD 0 will set NP0 to work in 802.1ad mode.
• diagnose npu np7 dvlan-mode 802.1Q all will set all NPUs to work in 802.1Q mode.

A reboot is required for custom DVLAN settings to take effect. To avoid any inconveniences or disruptions, changing the DVLAN settings should be done during a scheduled downtime or maintenance window. The DVLAN mode should only be changed if you are solely using the virtual wire pair (VWP) and are seeking to enhance performance. Enabling this feature may impact VLAN interfaces within your network.

In the virtual wire pair settings, the outer-vlan-id can be set. This is the same value as the outer provider-tag (S-Tag).

To configure the outer VLAN ID:

config system virtual-wire-pair
    edit "dvlan-test"
        set member "port33" "port34"
        set wildcard-vlan enable
        set outer-vlan-id 1234
    next
end