SMC Networks SMC TigerAccess SMC7824M/FSW - Manual (Page 275)

C
ONFIGURING
IEEE 802.1Q T
UNNELING
12-17
CLI – This example sets port 3 to accept only tagged frames, assigns
PVID 3 as the native VLAN ID, enables GVRP, sets the GARP timers,
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
Console(config)#interface ethernet 1/3 24-2
Console(config-if)#switchport acceptable-frame-types tagged 30-11
Console(config-if)#switchport ingress-filtering 30-12
Console(config-if)#switchport native vlan 3 30-13
Console(config-if)#switchport gvrp 30-4
Console(config-if)#garp timer join 20 30-5
Console(config-if)#garp timer leave 90
Console(config-if)#garp timer leaveall 2000
Console(config-if)#switchport mode hybrid
30-10
Console(config-if)#