QoS Scheduler Policies
Quality of Service Guide 533
Figure 35: Applying a Port Scheduler Policy to a Vport
The user adds a vport to an Ethernet port using the following command:
CLI Syntax: configure>port>ethernet>access>egress>vport vport-name
create
The vport is always configured at the port level even when a port is a member of a LAG. The
vport name is local to the port it is applied to but must be the same for all member ports of a
LAG. It however does not need to be unique globally on a chassis.
The user applies a port scheduler policy to a vport using the following command:
CLI Syntax: configure>port>ethernet>acess>egress>vport>port-
scheduler-policy port-scheduler-policy-name
A Vport cannot be parented to the port scheduler when it is using a port scheduler policy
itself. It is thus important the user ensures that the sum of the max-rate parameter value in
the port scheduler policies of all Vport instances on a given egress Ethernet port does not
oversubscribe the port’s rate. If it does, the scheduling behavior degenerates to that of the H/
W scheduler on that port. A Vport which uses an agg-rate, or a scheduler-policy can be
parented to a port scheduler. This is explained in Section Applying Aggregate Rate Limit to
a VPORT. The application of the agg-rate rate, port-scheduler-policy and scheduler-
policy commands under a VPORT are mutually exclusive.
W1
Uncontended
PORT
W4
Virtual Port for S-
VLAN=20 (provides
destination agg-rate
support)
VPORT
max-rate
(S-VLAN=20
rate)
C-VLAN1 Residential
Subscriber agg-rate-limit
H2 Q 4
H1 Q 5
EF Q 6
C-VLAN2 Business
Subscriber agg-rate-limit
BE Q 1
L2 Q 2
L1 Q 3
Weight X
Weight Y
Weight Z
Prio=4
H2 Q 4
H1 Q 5
EF Q 6
BE Q 1
L2 Q 2
L1 Q 3
Weight X
Weight Y
Weight Z
Weighted Scheduler
Group
Residential
Business
Prio=5
Prio=7
Prio=8
Prio=3
Prio=4
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