Linksys SRW208G, SRW208MP, SRW208L, SRW208P manual Security Storm Control, QoS CoS Settings

Chapter 5 Advanced Configuration

Number of Violations  Indicates the number of packets that arrived on the interface in single-host mode, from a host whose MAC address is not the supplicant MAC address.

Security > Storm Control

Port  Displays the port number for which storm control is enabled.

Security > Storm Control

Broadcast Control  Indicates whether broadcast packet types are forwarded on the specific interface.

Mode  Specifies the Broadcast mode currently enabled on the device. The possible field values are:

•• Unknown Unicast, Multicast & Broadcast  Counts Unicast, Multicast, and Broadcast traffic.

•• Multicast & Broadcast  Counts Broadcast and Multicast traffic together.

•• Broadcast Only  Counts only Broadcast traffic.

Rate Threshold  The maximum rate (packets per second) at which unknown packets are forwarded. The default value is 3500. The range is 70 -100000.

QoS

Network traffic is usually unpredictable, and the only basic assurance that can be offered is best effort traffic delivery. To overcome this challenge, Quality of Service (QoS) is applied throughout the network. This ensures that network traffic is prioritized according to specified criteria, and that specific traffic receives preferential treatment. QoS in the network optimizes network performance and entails two basic facilities:

Classifying incoming traffic into handling classes, based on an attribute, including:

•• The ingress interface

•• Packet content

•• A combination of these attributes

Providing various mechanisms for determining the allocation of network resources to different handling classes, including:

•• The assignment of network traffic to a particular hardware queue

•• The assignment of internal resources

•• Traffic shaping

The terms Class of Service (CoS) and QoS are used in the following context:

CoS provides varying Layer 2 traffic services. CoS refers to classification of traffic to traffic-classes, which are handled as an aggregate whole, with no per-flow settings. CoS is usually related to the 802.1p service that classifies flows according to their Layer 2 priority, as set in the VLAN header.

QoS refers to Layer 2 traffic and above. QoS handles per- flow settings, even within a single traffic class.

QoS > CoS Settings

QOS > CoS Settings

The CoS Settings screen contains fields for enabling or disabling CoS. In addition, the Trust mode can be selected. The Trust mode relies on predefined fields within the packet to determine the egress queue settings.

The CoS Settings screen has two areas, CoS Settings and CoS to Queue.

CoS Mode  Indicates if QoS is enabled on the interface. The possible values are:

•• Disable  Disables QoS on the interface.

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