Cabletron Systems SmartSwitch 8-slot, User'S Reference Manual

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Chapter 10: QoS Configuration Guide
SSR User Reference Manual 10 - 3
If a port operates in flow-bridging mode, the user can be more specific and configure
priorities for frames that match both a source AND a destination MAC address and a
VLAN ID. You can also specify a list of ports to apply the policy.
Note: In flow mode, you can also ignore the source MAC address and configure
the priority based on the destination MAC address only.
When applying QoS to a layer-2 flow, priority can be assigned as follows:
• The frame gets assigned a priority within the switch. Select “low, medium, high or
control”.
• The frame gets assigned a priority within the switch, AND if the exit ports are trunk
ports, the frame is assigned an 802.1Q priority. Select a number from 0 to 7. The
mapping of 802.1Q to internal priorities is the following: (0 = low) (1,2,3 =medium)
(4,5,6 = high) (7 = control)
To set a QoS policy on a layer-2 flow, enter the following command in Configure
mode:
Configure Layer-3 and 4 QoS
QoS policies applied at layer-3 and 4 allow you to assign priorities based on specific
fields in the IP and IPX headers. You can set QoS policies for IP flows based on source
IP address, destination IP address, source TCP/UDP port, destination TCP/UDP port,
type of service (TOS) and transport protocol (TCP or UCP). You can set QoS policies
for IPX flows based on source network, source node, destination network, destination
node, source port and destination port. A QoS policy set on an IP or IPX flow allows
you to classify the priority of traffic based on:
• Layer-3 source-destination flows
• Layer-4 source-destination flows
• Layer-4 application flows
Configure IP QoS Policies
To configure an IP QoS policy, perform the following tasks:
1. Identify the Layer-3 or 4 flow and set the IP QoS policy.
Set a layer-2 QoS policy.
qos set l2 name <name> source-mac <MACaddr>
dest-mac
<MACaddr> vlan <vlanID>
in-port-list <port-list>
priority control|high|medium|low| <trunk-
priority>