Interlogix GE-DSSG-244-POE User Manual - Manual (Page 98)

IFS NS3601-24P/4S GE-DSSG-244 and 244-POE User Manual
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Frame Income
Frame Leave
Income Frame is tagged Income Frame is untagged
Leave port is tagged Frame remains tagged Tag is inserted
Leave port is untagged Tag is removed Frame remain untagged
Table 4-6-1 Ingress/Egress port with VLAN VID Tag/Untag table
■ IEEE 802.1Q Tunneling (Q-in-Q)
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.
The Managed Switch 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 EtherType 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 switch, 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.