Allied Telesis AT-iMG606BD Spezifikationen PDF herunterladen (Seite 175)

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7. Quality of Service (QoS) QoSPolicies for the FX20 Interface

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AlliedView NMS Administration Guide

Note: In release 10.0 SP2, the EPON supports VLAN translations. As a result, the translated VLAN ID is also included as part of

setting the QOS policies.

7.12 QoSPolicies for the FX20 Interface

7.12.1 Overview

The NMS GUI for QoS allows you to configure ingress traffic parameters on the iMAP ports.

You can set the priority of traffic packets for the entire iMAP by setting the priority (usually through VLANs) and mapping

them to system-wide queues before forwarding. (This is done on the NMS by creating a profile for the Allied Telesis device.

By doing this, the administrator can set a queue number (0 = lowest priority; higher numbers = higher priority) and match it

to the p-bit value in the packet.

In the 11.0 release of iMAP software, there was an enhancement to provisioning egress interfaces for the FX20 interfaces; a

QosPolicy, which defines data stream attributes, could be associated with a specific queue on the FX20 interface. This was an

enhancement over other interfaces, where rate and burst attributes are defined for the entire interface (when using the

attribute EGRESSLIMITER), or where a QOSPOLICY defined data stream attributes on a VLAN basis (when provisioning

EPON).

On the NMS, there is already a GUI framework for creating the QoS Policies for the EPON/ONU configuration, as detailed

in 7.11.

In NMS 11.0 SP4, this FX20 QoS feature is added; using (for the most part) the NMS GUI that is used to configure

QoSPolicies, the administrator can engineer traffic going through the FX20 by creating an NMS Policy that is a set of

QosPolicies that tie together the queues and their data stream attributes. This policy is then included in a Profile that is for

the FX20 port. The same QosPolicy can be shared with multiple ports and queues since the configuration is applied on a per

port and per queue basis.

The following figure summarizes this feature. The iMG/RG is connected to the iMAP over an FX20 interface. Packets from

the network have a priority based on service (usually set through VLANs), and the iMAP-level profile will map the priorities

to queues. At the egress for an FX20 interface, a QoSPolicy is made up of a set of rules that tie together for each queue the

attributes of its data stream.

FIGURE 7-18 Summary of FX20 QoS per Queue Feature

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