Queue Parameters
28 Quality of Service Guide
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 Figure 1.
Figure 1: WRED queue: native mode
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.
qos
queue-group-templates
egress
queue-group <queue-group-name> create
queue <queue-id> create
wred-queue [policy <slope-policy-name>] mode native
Pool/megapool/
named-pool
High slope Low slope Exceed
slope
n/a n/a If slope shutdown,
total pool size is
used.
Table 3: WRED Per Queue Congestion Control Summary (Continued)
In profile
traffic
Out
profile
traffic
Exceed
profile
traffic
Wred-
queue
Mode
Slope
usage
Comments
Slopes in WRED queues
operate on the full
WRED pool size (MBS)
Buffers from reserve portion of
egress access/network pool
Buffers from shared portion of
egress access/network pool
MBS drop tail
Egress access/network
buffer pool
MBS
0946
CBS
Queue
depth
low-slope exceed-slope
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