HPE FlexFabric 5940 SERIES Configuration Guide

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Protocols and standards
• IEEE 802.1Q, IEEE Standard for Local and Metropolitan Area Networks-Virtual Bridged Local
Area Networks
• IEEE 802.1ad, IEEE Standard for Local and Metropolitan Area Networks-Virtual Bridged Local
Area 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. As a best practice to
ensure correct transmission of QinQ frames, set the MTU to a minimum of 1504 bytes for each
port on their forwarding path. This value is the sum of the default Ethernet interface MTU (1500
bytes) and the length (4 bytes) of a VLAN tag.
• You can use a QoS policy, a VLAN mapping, and QinQ on a port for VLAN tag manipulation. If
their settings conflict, the QoS policy has the highest priority, the VLAN mapping has the
medium priority, and QinQ has the lowest priority.
Enabling QinQ
Enable QinQ on customer-side ports of PEs. A QinQ-enabled port tags an incoming frame with its
PVID.
Before you enable or disable QinQ on a port, you must remove any VLAN mappings on the port.
To enable QinQ:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface view.
interface
interface-type
interface-number
N/A
3. Enable QinQ.
qinq enable
By default, QinQ is disabled.
Configuring transparent transmission for VLANs
You can exclude a VLAN (for example, the management VLAN) from the QinQ tagging action on a
customer-side port. This VLAN is called a transparent VLAN.
To ensure successful transmission for a transparent VLAN, follow these configuration guidelines:
• Set the link type of the port to trunk or hybrid, and assign the port to the transparent VLAN.
• Do not configure any other VLAN manipulation actions for the transparent VLAN on the port.
• Make sure all ports on the traffic path permit the transparent VLAN to pass through.
• If you use both transparent VLANs and VLAN mappings on an interface, the transparent VLANs
cannot be the following VLANs:
{ Original or translated VLANs of one-to-one, many-to-one, and one-to-two VLAN mappings.
{ Original or translated outer VLANs of two-to-two VLAN mappings.
To enable transparent transmission for a list of VLANs:

HPE FlexFabric 5940 SERIES Specifications

General

Brand	HPE
Model	FlexFabric 5940 SERIES
Category	Switch
Language	English