Manual

Chapter 14: Quality of Service
Section II: Advanced Operations 196
Configuring CoS
As explained in Quality of Service Overview on page 192, a tagged
packet received on a port is placed it into one of four priority queues on
the egress port according to the switch’s mapping of 802.1p priority
levels to egress priority queues. The default mappings are shown in
Table 8 on page 193.
However, you can override the mappings at the port level so that all
tagged packets are placed into a specific egress priority queue
regardless of the priority level in the packets themselves.
Note that this determination is made when a packet is received on the
ingress port and before the frame is forwarded to the egress port.
Consequently, you need to configure this feature on the ingress port.
For example, when you configure a switch port so that all ingress tagged
frames are handled by the egress priority queue Q2, all tagged frames
received on the port are directed to the Q2 priority egress queue on the
egress ports.
You can also use CoS to control which priority queue handles untagged
frames that ingress a port. By default, untagged frames (that is, frames
without VLAN or priority level information) are automatically assigned to
Q0, the lowest priority queue. But you can configure CoS on a port so
that all untagged frames received on the port are directed to one of the
other queues.
To configure CoS for a port, perform the following procedure:
1. From the Main Menu, type 7 to select Security and Services.
The Security and Services menu is shown in Figure 55.
Figure 55 Security and Services Menu
Allied Telesyn Ethernet Switch AT-8524M - AT-S62
Production Switch
User: Manager 11:20:02 02-Jan-2004
Security and Services
1 - Port Access Control (802.1X)
2 - Denial of Service (DoS)
3 - Class of Service (CoS)
4 - Keys/Certificates Configuration
5 - Secure Shell (SSH)
6 - Secure Socket Layer (SSL)
R - Return to Previous Menu
Enter your selection?