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Chapter 5
Advanced Configuration
40
WebView Switches
Security > Storm Control
Security > Storm Control
Port Displays the port number for which storm control is
enabled.
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. This option is
not available on the SRW224G4 and SRW248G4.
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 70–100,000.
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
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.
QoS > CoS Settings
The CoS Settings screen has two areas, CoS Settings and
CoS to Queue.
QoS Mode Indicates if QoS is enabled on the interface.
The possible values are:
Disable • Disables QoS on the interface.
Basic • Enables QoS on the interface.
Advanced • Enables Advanced mode QoS on the
interface. This feature has been added to version
1.2 of the SRW2024/SRW2016 and version 1.1 of the
SRW224G4/SRW248G4.