Configuring one-to-two VLAN mapping
Configure one-to-two VLAN mapping on customer-side ports of the edge devices from which customer traffic enters SP networks, for example, on PE 1 and PE 4 in Figure 64. One-to-two VLAN mapping enables the edge devices to add an SVLAN tag to each incoming packet.
Before you configure one-to-two VLAN mapping, create the CVLAN and the SVLAN.
The MTU of an interface is 1500 bytes by default. After a VLAN tag is added to a packet, the packet length is added by 4 bytes. As a best practice, set the MTU to a minimum of 1504 bytes for ports on the forwarding path of the packet in the service provider network.
To configure one-to-two VLAN mapping:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter Layer 2 Ethernet interface view or Layer 2 aggregate interface view. |
| N/A |
3. Configure the link type of the port as hybrid. | port link-type hybrid | By default, the link type of a port is access. |
4. Assign the port to the CVLANs. | port hybrid vlan vlan-id-list { tagged | untagged } | By default, a hybrid port is an untagged member of the VLAN to which the port belongs when its link type is access. |
5. Assign the port to the SVLANs as an untagged member. | port hybrid vlan vlan-id-list untagged | By default, a hybrid port is an untagged member of the VLAN to which the port belongs when its link type is access. |
6. Configure a one-to-two VLAN mapping. | vlan mapping nest { range vlan-range-list | single vlan-id-list } nested-vlan vlan-id | By default, no VLAN mapping is configured on an interface. |