Avaya X330WAN manual Frame Relay Encapsulation, Priority Dlci

Chapter 4 Operational Concepts and Configuration Examples

Use the following commands to configure Backup interfaces:

•backup delay Configures the Primary-Backup switchover delay.

•backup interface Configures a backup interface for a Primary interface. This command is used within the Primary interface’s context.

Frame Relay Encapsulation

X330WAN supports the following Frame Relay QoS features:

•Priority DLCI

•Traffic Shaping and Marking per VC

•Priority queuing

These features and their implementation are described in the following sections. To improve voice quality using cRTP, refer to the “Configuration tip” on page 54.

Priority DLCI

To implement new priority mechanisms, ISPs rely on new classes of service. Traffic types and users are divided into these classes and treated differently during peak periods. A premium, or first class user or traffic stream receives higher priority than a general user. This rating system ensures that the critical Internet user maintains peak performance, as well as provides a means for the ISPs to enhance the cost structure of network operations.

X330WAN supports Class-based traffic assignment, referred to as Priority DLCI. This separates traffic with different QoS levels to up to four different VCs on the same Frame-Relay sub-interface. This feature enables you to assign unique Permanent VCs (PVCs) for VoIP and non-VoIP traffic. You can set and adjust the priority using Policy. For more information, refer to "Policy" on page 48.

Configure the Priority DLCI using the frame-relaypriority-dlci-groupcommand in the serial sub-interface context. Specify the DLCIs in this command from the highest to lowest priority. If you specify less than four DLCIs, the last DLCI specified is automatically used for the missing priorities.

Note: When using Priority DLCI, the primary DLCI is used to determine the state of

the Sub Frame Relay interface: when the primary DLCI is up, the Sub Frame Relay interface is up, and when the primary DLCI is down, the Sub Frame Relay interface is down. When using Priority DLCI, it is therefore recommended to verify that the primary DLCI is set as the High Priority DLCI in the Priority DLCI group.

46 Avaya X330WAN User’s Guide