ZyXEL Communications IES-612-51A Guía de usuario descargar pdf (Pagina 367)

Chapter 55 Virtual Channel Commands

IES-612-51 User’s Guide

367

55.7 Transparent LAN Service (TLS)

Transparent LAN Services (also known as VLAN stacking or Q-in-Q) allows a service

provider to distinguish multiple customers VLANs, even those with the same (customer-

assigned) VLAN ID, within its network.

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 IES-612-51 sends the frames from the customers, the VLAN ID is added to the

frames. When packets intended for specific customers are received on the IES-612-51, the

outer VLAN tag is removed before the traffic is sent.

See Chapter 30 on page 211 for an example.

pppoe pads =

The number of pads PDUs sent by the BRAS to the IES-612-51.

pppoe padt =

The number of padt PDUs sent and received by the IES-612-51.

pppoe srvcname

error

The number of service name errors; for example, the IES-612-

51’s specified service is different than the BRAS’s setting.

pppoe ac system

error

The number of times the access concentrator experienced an

error while performing the Host request; for example, when

resources are exhausted in the access concentrator. This value

does not include the number of times the IES-612-51 checks the

AC name field in the BRAS's reply PDU and finds a mismatch,

however.

pppoe generic

error

The number of other types of errors that occur in the PPPoE

session between the IES-612-51 and the BRAS.

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ZyXEL Communications IES-612-51A Guía de usuario Pagina 367