214
Step Command Remarks
replace the VLAN tags of the
packets destined for the user
network.
packets destined for the user
network.
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 46. One-to-t
wo 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.
• Enter Layer 2 Ethernet interface
view:
interface interface-type
interface-number
• Enter Layer 2 aggregate
interface view:
interface bridge-aggregation
interface-number
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.
Configuring two-to-two VLAN mapping
Configure two-to-two VLAN mapping on the customer-side port of an edge device that connects two
SP networks, for example, on PE 3 in Figure 46. T
wo-to-two VLAN mapping enables two sites in
different VLANs to communicate at Layer 2 across two service provider networks that use different
VLAN assignment schemes.
Before you configure two-to-two VLAN mapping, create the original VLANs and the translated
VLANs.
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