Setting Vlan Port Table - Planet XDL-2420R User Manual

Button
: Save configuration.
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4.2.16 Setting VLAN Port Table

This section introduces how to configure VLAN Port table and user can customize their VLAN application. The screen in
4-2-19 appears.
The Set VLAN table is Q-in-Q VLAN concept.
■ IEEE 802.1Q Tunneling (Q-in-Q)
IEEE 802.1Q Tunneling (Q-in-Q) is designed for service providers carrying traffic for multiple customers across their networks.
Q-in-Q 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
4094.
The IP DSLAM supports multiple VLAN tags and can therefore be used in MAN applications as a provider bridge, aggregating
traffic from numerous independent customer LANs into the MAN (Metro Access Network) space. One of the purposes of the
provider bridge is to recognize and use VLAN tags so that the VLANs in the MAN space can be used independent of the
customers' VLANs. This is accomplished by adding a VLAN tag with a MAN-related VID for frames entering the MAN. When
leaving the MAN, the tag is stripped and the original VLAN tag with the customer-related VID is again available.
This provides a tunneling mechanism to connect remote costumer VLANs through a common MAN space without interfering
with the VLAN tags. All tags use Ether Type 0x8100 or 0x88A8, where 0x8100 is used for customer tags and 0x88A8 are used
for service provider tags.
In cases where a given service VLAN only has two member ports on the IP DSLAM, the learning can be disabled for the
particular VLAN and can therefore rely on flooding as the forwarding mechanism between the two ports. This way, the MAC
table requirements is reduced.
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Figure