Configuring Interface-based VLAN Assignment (LNP Dynamically Negotiates the Link Type)

Procedure

1. Run system-view

   The system view is displayed.

2. Run undo lnp disable

   LNP is enabled globally.

   By default, LNP is enabled on all interfaces.

3. Run interface interface-type interface-number

   The view of the Ethernet interface that needs to be enabled with LNP is displayed.

4. Run undo port negotiation disable

   LNP is enabled on the Layer 2 Ethernet interface.

   By default, LNP is enabled on all interfaces of the device.

   

   When performing this step, ensure that the interface is a Layer 2 interface. If the interface is not a Layer 2 interface, run the portswitch command to configure the interface as a Layer 2 interface.

   When an LNP-capable device is used with an LNP-incapable device, the LNP-capable device continuously sends LNP packets, which wastes bandwidth. You can run the port negotiation disable command in the Layer 2 Ethernet interface view to disable LNP.

   To ensure successful negotiation, ensure that LNP is enabled both globally and in the interface view.

5. Run port link-type { negotiation-desirable | negotiation-auto }

   An LNP mode is configured.

   By default, the LNP mode of a Layer 2 Ethernet interface on the S2720-EI, S5720I-SI, S5720-LI, S5735-L, S5735S-L, S5735S-L-M, S5720S-LI, S6720-LI, S6720S-LI, S5730-SI, S5730S-EI, S6720-SI, S6720S-SI, S5720-SI, S5735-S, S5735S-S, S5735-S-I, and S5720S-SI is negotiation-auto, and the LNP negotiation mode of a Layer 2 Ethernet interface on other models is negotiation-desirable.

   There are limitations on an interface where the LNP mode is set to negotiation-desirable or negotiation-auto:

   • The sub-interface cannot be created.
   • The MUX VLAN cannot be enabled.
   • The voice VLAN in auto mode cannot be configured on the interface.

6. Configure the VLAN allowed by an interface.

   • When a trunk interface is negotiated, perform the following operations:

     1. Run port trunk allow-pass only-vlan { { vlan-id1 [ to vlan-id2 ] } &<1-10> | none }

        The VLAN allowed by the trunk interface is configured.

        By default, a trunk interface allows all VLANs.

     2. (Optional) Run port trunk pvid vlan vlan-id

        The default VLAN of the interface is configured.

        When the interface connected to an AP or voice terminal receives untagged and tagged frames, configure the default VLAN for the interface so that the interface adds the VLAN tag to untagged frames.

        By default, the default VLAN of a trunk interface is VLAN 1.

   • When an access interface is negotiated, perform the following operation:

     Run port default vlan vlan-id

     The default VLAN is configured for the access interface and the access interface is added to the specified VLAN.

     By default, the default VLAN of an access interface and the VLAN that an access interface joins are both VLAN 1.