Configuring IEEE 802.1Q Tunneling
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Web – Click VLAN, 802.1Q VLAN, Port Configuration or Trunk Configuration. Fill in
the required settings for each interface, click Apply.
Figure 3-77 Configuring VLANs per Port
CLI – This example sets port 3 to accept only tagged frames, assigns PVID 3 as the
native VLAN ID, and then sets the switchport mode to hybrid.
Configuring IEEE 802.1Q Tunneling
IEEE 802.1Q Tunneling (QinQ) is designed for service providers carrying traffic for
multiple customers across their networks. QinQ tunneling is used to maintain
customer-specific VLAN and Layer 2 protocol configurations even when different
customers use the same internal VLAN IDs. This is accomplished by inserting
Service Provider VLAN (SPVLAN) tags into the customer’s frames when they enter
the service provider’s network, and then stripping the tags when the frames leave
the network.
A service provider’s customers may have specific requirements for their internal
VLAN IDs and number of VLANs supported. VLAN ranges required by different
customers in the same service-provider network might easily overlap, and traffic
passing through the infrastructure might be mixed. Assigning a unique range of
VLAN IDs to each customer would restrict customer configurations, require intensive
processing of VLAN mapping tables, and could easily exceed the maximum VLAN
limit of 4096.
QinQ tunneling uses a single Service Provider VLAN (SPVLAN) for customers who
have multiple VLANs. Customer VLAN IDs are preserved and traffic from different
customers is segregated within the service provider’s network even when they use
the same customer-specific VLAN IDs. QinQ tunneling expands VLAN space by
Console(config)#interface ethernet 1/3 4-116
Console(config-if)#switchport acceptable-frame-types tagged 4-171
Console(config-if)#switchport ingress-filtering 4-171
Console(config-if)#switchport native vlan 3 4-172
Console(config-if)#switchport mode hybrid 4-170
Console(config-if)#
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