Quality Of Service (Qos); Prioritized Bridging; Scheduling Mechanisms - Draytek Vigor VigorAccess IVD User Manual

Multi-Protocol Encapsulation
IVD supports bridge and routed of multi-protocol encapsulation over ATM adaptation Layer 5
based on RFC2684.
Management
IVD supports some management method as listed below.
Remote configuration backup/restore via EMS client/server.
Remote firmware upgrade
SNMP management
Command Line Interface, it can be accessed by local Console or Telnet interface.
Multiple PVC on single port
IVD allows you to use different virtual connection also called PVC (Permanent Virtual Circuits) for
different services or subscribers. Users can define up to 8 PVC connections on each DSL port for
different services or levels of service, and users can assign different priority for each connection.
PVC Binding VLAN
DSLAM supports binding of ATM PVCs of a given DSL port to different VLANs according to
WT101 of DSL Forum, IPDSLAM supports simultaneously the following
‧ binding multiple ATM PVCs (of same or different DSL ports) to a singe VLAN,
‧ binding multiple (m) ATM PVCs (of same or different DSL ports) to multiple (n)
‧ VLAN where m>=n and n≠1.
A given ATM PVC will not be bound to more than one VLAN.
IGMP Snooping
IGMP (Internet Group Management Protocol) snooping reduces multicast traffic for maximum
performance. The feature is very popular for video multicast application for example IPTV service.

3.2 Quality of Service (QoS)

Quality of Service (QoS) refers to the capability of a network to provide better service to select
network traffic over various technologies. The primary goal of QoS is to provide priority including
dedicated bandwidth, controlled jitter and latency (required by some real-time and interactive
traffic), and improved loss characteristics. Also it is important to make sure that providing priority
for one or more flows does not make other flows fail. QoS technologies provide the elemental
building blocks that will be used for future business applications in campus, WAN and service
provider networks. This feature can be used for VoIP traffics.

3.2.1 Prioritized Bridging

IVD supports for multiple queues per port. There are different queues both on ATM and Ethernet
uplink.
Four queues supported per ATM port.
Eight queues supported per physical Ethernet port.

3.2.2 Scheduling Mechanisms

IVD supports multiple scheduling mechanisms.
Strict Priority Scheduling
Probabilistic Priority Scheduling
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Version: 1.5