Sub-interfaces can be configured on a Layer 3 Eth-Trunk. When Layer 3 devices connect to Layer 2 devices in different VLANs through the Layer 3 Eth-Trunk, sub-interfaces must be configured on the Eth-Trunk to identify packets from different VLANs and to enable users in different VLANs to communicate with each other.
Procedure
Run system-view
The system view is displayed.
Run interface eth-trunk trunk-id
An Eth-Trunk is created and the Eth-Trunk interface view is displayed.
Run undo portswitch
A Layer 3 Eth-Trunk is configured.
Run quit
The system view is displayed.
Run interface eth-trunk trunk-id.subnumber
An Eth-Trunk sub-interface is created.
subnumber specifies the number of a sub-interface. The value ranges from 1 to 4096.
Run ip address ip-address { mask | mask-length } [ sub ]
An IP address is configured for the sub-interface.
When configuring multiple IP addresses for an Eth-Trunk sub-interface, use the sub keyword to indicate the IP addresses configured after the first one.
