ATL Telecom R1-SW Ethernet Switch - Manual (Page 183)

Configuring QoS
9-15
QoS on the Corecess R1-SW24L2B
This section describes QoS features supported by the Corecess R1-SW24L2B. The following
figure shows QoS structure on the Corecess R1-SW24L2B:
The Corecess R1-SW24L2B classifies the packets from ingress (incoming) port according to the
criteria defined the class map, stores the classified packets to each transmit queue (0 ~ 7), and
transmits packets via TC (Traffic Class) applied the QoS action defied the policy map.
Packet Classification
Packet classification partitions traffic into multiple priority levels, or classes of service. The
Corecess R1-SW24L2B uses the values in the following fields of the layer 1 ~ layer 4 IP packet
header as a criterion to classify packets:
y Layer 1:Input/output port number
y Layer 2: Source/destination MAC address, EtherType field, DSAP field, 802.1P filed, VLAN ID
y Layer 3:Source/destination IP address, protocol ID, TOS/IP Precedence/DSCP filed
y Layer 4:Input/output port number, TCP flag
Input port #1
Output
port #1
Q0
.
.
Q1
Q6
Q7
TC #1
TC #1
TC #1
.
.
.
.
TC #216
TC #217
TC #218
Input port #n
Classifier
match
.
.
.
.
match
match
.
.
.
.
.
.
Output
port #n
Q0
.
.
Q1
Q6
Q7