Tls Network Example - ZyXEL Communications MSC1024G Series User Manual

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Use TLS to add an outer VLAN tag to the inner IEEE 802.1Q tagged frames that enter the

network. By tagging the tagged frames ("double-tagged" frames), the service provider can

manage up to 4,094 VLAN groups with each group containing up to 4,094 customer VLANs.

This allows a service provider to provide different services, based on specific VLANs, for

many different customers.

A service provider's customers may require a range of VLANs to handle multiple

applications. A service provider's customers can assign their own inner VLAN tags to traffic.

The service provider can assign an outer VLAN tag for each customer. Therefore, there is no

VLAN tag overlap among customers, so traffic from different customers is kept separate.

Before the switch sends the frames from the customers, the VLAN ID is added to the frames.

When packets intended for specific customers are received on the MSC, the outer VLAN tag is

removed before the traffic is sent.

11.8.7 TLS Network Example

In the following example figure, both A and B are Service Provider's Network (SPN)

customers with VPN tunnels between their head offices and branch offices respectively. Both

have an identical VLAN tag for their VLAN group. The service provider can separate these

two VLANs within its network by adding tag 37 to distinguish customer A and tag 48 to

distinguish customer B at edge device 1 and then stripping those tags at edge device 2 as the

data frames leave the network.

Figure 141 VLAN Stacking Example

11.8.7.1 VLAN Tag Format

A VLAN tag (service provider VLAN stacking or customer IEEE 802.1Q) consists of the

following three fields.

Table 91 VLAN Tag Format

Type is a standard Ethernet type code identifying the frame and indicates that whether the

frame carries IEEE 802.1Q tag information. SP TPID (Service Provider Tag Protocol

Identifier) is the service provider VLAN stacking tag type. The system use 0x8100.

MSC1000G/1024G/1224G Series User's Guide

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