Native Queue Mode - Alcatel-Lucent 7450 Quality Of Service Manual

Queue Parameters
Table 3: WRED Per Queue Congestion Control Summary (Continued)
Pool/megapool/
named-pool

Native Queue Mode

When an egress queue is configured for native mode, it will use the native WRED capabilities
of the forwarding plane queue. This is only supported on FP3 hardware.
Congestion control within the queue will use the low and exceed slopes from the applied
slope policy together with the MBS drop tail. The queue continues to take buffers from its
associated egress access or network buffer pool, on which WRED can also be enabled. This
is shown in
To configure a native WRED queue, the wred-queue command is used under queue in a SAP
egress QoS policy or egress queue group template with the mode set to native as follows.
28
In profile Out
traffic profile
traffic
High slope Low slope
Figure 1.
MBS drop tail
Egress access/network
buffer pool
qos
queue-group-templates
egress
queue-group <queue-group-name> create
queue <queue-id> create
wred-queue [policy <slope-policy-name>] mode native
Exceed Wred-
profile queue
traffic Mode
Exceed n/a
slope
Figure 1: WRED queue: native mode
Buffers from shared portion of
egress access/network pool
Buffers from reserve portion of
egress access/network pool
low-slope exceed-slope
Queue
depth
MBS
Slope Comments
usage
n/a If slope shutdown,
total pool size is
used.
Slopes in WRED queues
operate on the full
WRED pool size (MBS)
CBS
Quality of Service Guide
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