Cisco SRW2008P User Guide - Page 42

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: 8-Port 10/100/1000 Gigabit Switch with Webview •• 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 perflow 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. 36