Cisco Systems SLM2008RF QoS

Advanced Configuration

QoS

Cisco SLM2008 8-Port Gigabit Smart Switch with PD and AC Power Administration Guide 35

•Multicast Rate—Select the storm control multicast rate threshold from the

list or select the default value, No Limit.

STEP 3 Click Save.

QoS

Network traffic is usually unpredictable and the only basic assurance that can be

offered is best effort traffic delivery. To overcome this challenge, 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

You can set the switch to service the queues based on a strict rule that requires all

traffic in a higher priority queue to be processed before lower priority queues are

serviced, or use Weighted Round-Robin (WRR) queuing that specifies a relative

weight of each queue. WRR uses a pre-defined relative weight for each queue that

determines the percentage of service time the switch services each queue before

moving on to the next queue. This prevents the head-of-line blocking that can

occur with strict priority queuing.