Cabletron Systems SmartSwitch Router 9032578-02 - Manual (Page 179)

SmartSwitch Router User Reference Manual 179
Chapter 11
QoS Configuration
Guide
QoS & Layer-2/Layer-3/Layer-4 Flow Overview
The SSR allows network managers to identify traffic and set Quality of Service (QoS)
policies without compromising wire speed performance. The SSR can guarantee
bandwidth on an application by application basis, thus accommodating high-priority
traffic even during peak periods of usage. QoS policies can be broad enough to encompass
all the applications in the network, or relate specifically to a single host-to-host application
flow.
Within the SSR, QoS policies are used to classify Layer-2, Layer-3, and Layer-4 traffic into
the following priorities:
• Control
• High
• Medium
• Low
By assigning priorities to network traffic, you can ensure that critical traffic will reach its
destination even if the exit ports for the traffic are experiencing greater-than-maximum
utilization.
Layer-2, Layer-3 & Layer-4 Flow Specification
For Layer-2 traffic, you can define a flow based on the MAC packet headers.
• The MAC fields are source MAC address, destination MAC address and VLAN IDs. A
list of incoming ports can also be specified