Alcatel-Lucent OmniSwitch AOS Release 7 - Page 504

page 21-12 OmniSwitch AOS Release 7 Network Configuration Guide March 2011
Queue Set (QSet) Framework (Unicast Traffic)
In this example illustration:
• Ingress packets destined for port 1/1 and port 2/1 are queued into CoS/VOQs allocated by the ingress
TM. These are the physical VOQs (pVOQs), that reside on each NI for every port in the switch.
• The centralized scheduler within the switch fabric maintains a QSI for port 1/1 and port 2/1.
• The QSP assigned to the QSI for port 1/1 and port 2/1 s applied by the scheduler to all pVOQ flows
destined for port 1/1 or port 2/1.
• There are four pre-defined QSPs supported. In this example, the default QSP 1 is associated with the
QSI for port 1/1. However, QSP 4 was assigned to the QSI for port 2/1.
• QSP 1 applies the default WRED profile 1 (WRP 1) to the QSI for port 1/1. QSP 4 applies the user-
defined WRP 4 to the QSI for port 2/1.
• The QSet framework shown in this example applies to unicast traffic. Selecting QSPs and configuring
WRPs only applies to unicast VOQ queue management.
Note that the VOQs that reside in the switch fabric, as represented by QSet instances, is just a state space
where configured and dynamic parameters for each VOQ is specified. There is no physical buffer memory
associated with these VOQs in the fabric. Packets are not buffered in fabric
Ingress Packet
Processor
(PP)
Ingress Traffic
Manager
(TM)
Slot 1
Dst port 1/1
7
6
5
4
3
2
1
0
QSI for 1/1
QSet Profile 4
Q1 = EF, 20% BW
Q2 = SP7+6, 100% BW
Q3 = SP5, 100% BW
Q4 = AF4, 40% BW
Q5 = AF2, 30% BW
Q6 = AF1, 20% BW
Q7 = AF0, 10% BW
Q8 = BE, 0% BW
WRED Profile 2
Queue thresholds and
drop probability for
green, yellow, and red
packets.
Dst port 2/1
7
6
5
4
3
2
1
0
Physical VOQs
(pVOQs)
Ingress Packet
Processor
(PP)
Ingress Traffic
Manager
(TM)
Slot 2
Dst port 1/1
7
6
5
4
3
2
1
0
Dst port 2/1
7
6
5
4
3
2
1
0
VOQs
7
6
5
4
3
2
1
0
VOQs
7
6
5
4
3
2
1
0
QSet Profile 1
Q1 = SP7, 100% BW
Q2 = SP6, 100% BW
Q3 = SP5, 100% BW
Q4 = SP4, 100% BW
Q5 = SP3, 100% BW
Q6 = SP2, 100% BW
Q7 = SP1, 100% BW
Q8 = SP0, 100% BW
WRED Profile 1
Queue thresholds and
drop probability for
green, yellow, and red
packets.
QSI for 2/1
Switch Fabric