Restrictions And Guidelines; Configuring Qinq; Enabling Qinq - HP FlexFabric 12900 Series Configuration Manual

IEEE 802.1ad, IEEE Standard for Local and Metropolitan Area Networks-Virtual Bridged Local Area
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Networks-Amendment 4: Provider Bridges

Restrictions and guidelines

When you configure QinQ, follow these restrictions and guidelines:
The inner 802.1Q tag of QinQ frames is treated as part of the payload. For correct transmission of
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QinQ frames, HP recommends that you set the MTU to a minimum of 1504 bytes for each port on
the forwarding path of QinQ frames. This value is the sum of the default Ethernet interface MTU
(1500 bytes) and the length (4 bytes) of a VLAN tag.
EVB and QinQ are mutually exclusive. Do not enable both of the features on a port.
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• Two-to-two VLAN mapping and QinQ are mutually exclusive. You cannot configure the two features
on the same port.
You cannot enable QinQ on a port that has VLAN mapping configuration.
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When you first enable QinQ and then configure one-to-two VLAN mapping on a port, packets are
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processed as follows:
Packets matching the one-to-two VLAN mapping configuration are tagged with the specified
SVLAN tag.
Packets not matching the one-to-two VLAN mapping are tagged with the PVID tag.
• When you first enable QinQ and then configure one-to-one VLAN mapping on a port, packets are
processed as follows:
The CVLAN tag of packets matching the one-to-one VLAN mapping configuration is replaced
with the specified SVLAN tag.
Packets not matching the one-to-one VLAN mapping are tagged with the PVID tag.
For more information about VLAN mapping, see

Configuring QinQ

Enable QinQ on customer-side ports of PEs.

Enabling QinQ

A QinQ-enabled port tags an incoming frame with its PVID.
To enable QinQ:
Step
1. Enter system view.
2. Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface view.
3. Enable QinQ.
"Configuring VLAN
Command
system-view
interface interface-type
interface-number
qinq enable
153
mapping."
Remarks
N/A
N/A
By default, QinQ is disabled.