Some ISP providers require a VLAN tag for Internet connection. However, we would find that Internet connection could not work when setting a specified VLAN tag value on WAN Interface. That may be due to the VLAN ID having been reserved by Vigor Router. In this case, we need to change the range of the VLAN ID reserved for the system to make the Internet connection work.
Vigor Router reserve some VLAN IDs for its system by default. To check the range of the VLAN IDs reserved for the system, we can use the telnet command "vlan sysvid show".
Take Vigor2927 for example, the VLAN ID reserved for the system is in the range 3900 ~ 4015.
Suppose an ISP provider requires a VLAN ID 4001 on WAN Interface, VLAN ID 4001 is reserved for the system, and a conflict will occur. We can use the telnet command "vlan sysvid [VLAN ID]" to change the range of the VLAN ID reserved for the system.
Since the reserved VLAN ID is different on each model, we could check the command example first by commanding "vlan sysvid ?" before we change it.
After commanding "vlan sysvid 3800", we can see the VLAN ID range reserved for the system has been changed to 3800~3915. Please reboot the router by “sys reboot” to make sure the new VLAN setting is applied.
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