Avaya P580 - Manual (Page 651)

Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, v5.3.1 -5
80-Series QoS
2. Forwarding the frame or packet from the queue to the egress
port for transmission.
The switch uses algorithms that allocate bandwidth among
the egress queues to forward the traffic in the queues. The
Avaya Multiservice switch software supports the following
queue-servicing algorithms for egress ports:
— Weighted fair queuing (WFQ)
— Class-based queuing (CBQ)
— Class-based weighted fair queuing (CBWFQ)
— Strict Priority Queuing
Example
You want to assign a priority of 5 to a VoIP flow that is destined to
an IP 600 phone switch. You then want the switch to use the
CBWFQ queue-servicing algorithm to forward frames from queue 5.
The IP 600 phone switch is connected to an Avaya P882
Multiservice switch on port 5.5.
1. You set up an ACL rule that associates a priority of 5 with the
destination IP address of the VoIP flow. (VoIP traffic cannot
tolerate latency or frame loss, so it needs a high priority to
ensure its timely delivery.)
*Note: Priority 5 serves as an example only. Actual
implementations may vary.
2. You enable CBWFQ for queue 5 on port 5.5.
3. The switch assigns a priority of 5 to the ingress VoIP packets
and forwards them through ingress queue 5 to the egress
port.
4. The switch stores the VoIP packets in egress queue 5 on port
5.5. (The switch places packets in the queue that matches
their priority.)
5. The switch uses the CBWFQ algorithm to remove the packets
from queue 5 and forward them to the IP 600 phone switch.