Administration of the Avaya G350 Media Gateway - Avaya Support

Frame relay encapsulationFrame relay encapsulationThe Avaya G350 Media Gateway supports the following frame relay encapsulation features:●●●Priority DLCITraffic shaping and marking per Virtual Channel (VC)Priority queuingNote:Note:The term Virtual Channel (VC) refers to the unidirectional flow of ATM cellsbetween connecting (switching or end-user) points that share a commonidentifier number.To improve voice quality using RTP, see Configuring RTP header compression on page 72.Priority DLCITo implement new priority mechanisms, ISPs rely on new classes of service. Traffic types andusers are divided into these classes and treated differently during peak periods. A premium, orfirst class user or traffic stream receives higher priority than a general user. This rating systemensures that the critical Internet user maintains peak performance. It also provides a means forISPs to enhance the cost structure of network operations.The G350 supports class-based traffic assignment (priority DLCI). Priority DLCI is essentially ameans for implementing QoS. The G350 separates traffic with different QoS levels to up to fourdifferent VCs on the same frame relay sub-interface. This feature enables you to assign uniquePermanent VCs (PVC) for VoIP and non-VoIP traffic. You can set and adjust the priority usingpolicy. For more information, see Configuring policy on page 253.Configure Priority DLCI using the frame-relay priority-dlci-group command in theserial sub-interface context. Specify the DLCIs in this command from the highest to lowestpriority. If you specify less than four DLCIs, the last DLCI specified is automatically used for themissing priorities.When using Priority DLCI, the primary DLCI is used to determine the state of the sub framerelay interface. When the primary DLCI is up, the sub frame relay interface is up. When theprimary DLCI is down, the sub frame relay interface is down. When using Priority DLCI, it istherefore recommended to verify that the primary DLCI is set as the High Priority DLCI in thePriority DLCI group.On the Avaya G350 Media Gateway, OSPF is mapped by default to the High Priority DLCI. Forbetter network reliability, it is recommended to verify that the same configuration exists on theother side of the frame relay connection.Issue 3 January 2005 103