HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 2 - LAN Switching Co - Page 166

Protocols and standards, QinQ configuration task list

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The device determines whether a received frame carries an SVLAN or CVLAN tag by checking the TPID value. For example, if a frame carries an SVLAN tag with TPID value 0x9100 and a CVLAN tag with TPID value 0x8100 and the configured TPID value of the SVLAN tag is 0x9100 and that of the CVLAN tag is 0x8200, the device considers that the frame carries only the SVLAN tag but not the CVLAN tag. Devices of different vendors may set the TPID of the outer VLAN tag of QinQ frames to different values. For compatibility with these devices, modify the TPID value so that the QinQ frames, when sent to the public network, carry the TPID value identical to the value of a particular vendor, allowing interoperability with the devices of that vendor. The TPID in an Ethernet frame has the same position as the protocol type field in a frame without a VLAN tag. To avoid problems in packet forwarding and handling in the network, do not set the TPID value to any of the reserved values. Table 20 Reserved protocol type values Protocol type ARP PUP RARP IP IPv6 PPPoE MPLS IPX/SPX IS-IS LACP 802.1X Cluster Reserved Value 0x0806 0x0200 0x8035 0x0800 0x86DD 0x8863/0x8864 0x8847/0x8848 0x8137 0x8000 0x8809 0x888E 0x88A7 0xFFFD/0xFFFE/0xFFFF Protocols and standards IEEE 802.1Q: IEEE standard for local and metropolitan area networks: Virtual Bridged Local Area Networks QinQ configuration task list When you configure QinQ, follow these guidelines: • QinQ requires configurations only on the service provider network. • QinQ configurations made in Ethernet interface view take effect on the interface only. Those made in Layer 2 aggregate interface view take effect on the aggregate interface and all member ports in the aggregation group. • Do not configure QinQ on a reflector port. For more information about reflector ports, see Network Management and Monitoring Configuration Guide. 157

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157
The device determines whether a received frame carries an SVLAN or CVLAN tag by checking the TPID
value. For example, if a frame carries an SVLAN tag with TPID value 0x9100 and a CVLAN tag with TPID
value 0x8100 and the configured TPID value of the SVLAN tag is 0x9100 and that of the CVLAN tag is
0x8200, the device considers that the frame carries only the SVLAN tag but not the CVLAN tag.
Devices of different vendors may set the TPID of the outer VLAN tag of QinQ frames to different values.
For compatibility with these devices, modify the TPID value so that the QinQ frames, when sent to the
public network, carry the TPID value identical to the value of a particular vendor, allowing
interoperability with the devices of that vendor.
The TPID in an Ethernet frame has the same position as the protocol type field in a frame without a VLAN
tag. To avoid problems in packet forwarding and handling in the network, do not set the TPID value to
any of the reserved values.
Table 20
Reserved protocol type values
Protocol type
Value
ARP
0x0806
PUP
0x0200
RARP
0x8035
IP
0x0800
IPv6
0x86DD
PPPoE
0x8863/0x8864
MPLS
0x8847/0x8848
IPX/SPX
0x8137
IS-IS
0x8000
LACP
0x8809
802.1X
0x888E
Cluster
0x88A7
Reserved
0xFFFD/0xFFFE/0xFFFF
Protocols and standards
IEEE 802.1Q:
IEEE standard for local and metropolitan area networks: Virtual Bridged Local Area
Networks
QinQ configuration task list
When you configure QinQ, follow these guidelines:
•
QinQ requires configurations only on the service provider network.
•
QinQ configurations made in Ethernet interface view take effect on the interface only. Those made
in Layer 2 aggregate interface view take effect on the aggregate interface and all member ports in
the aggregation group.
•
Do not configure QinQ on a reflector port. For more information about reflector ports, see
Network
Management and Monitoring Configuration Guide
.