QoS Policies
Quality of Service Guide 29
slope-usage exceed-low
exit
exit
exit
exit
sap-egress <policy-id> create
queue <queue-id> [<queue-type>] [create]
wred-queue [policy <slope-policy-name>] mode native
slope-usage exceed-low
exit
exit
Congestion control is provided by both the slope policy applied to the queue and the MBS tail
drop.
The slope-usage defines the mapping of the traffic profile to the WRED slope and only
exceed-low is allowed with a native mode queue. The slope mapping is shown below and
requires the low and exceed slopes to be no shutdown in the applied slope policy (otherwise
traffic will use the MBS drop tail or a pool slope):
• Out of profile maps to the low slope.
• Exceed profile maps to the exceed slope.
The instantaneous queue depth is used against the slopes when native mode is configured,
consequently the time-average-factor within the slope policy is ignored.
The in profile traffic uses the MBS drop tail for congestion control (the high slope is not used
with a native mode queue).
If a queue is configured to use native mode WRED per queue on hardware earlier than FP3,
the queue operates as a regular queue.
If the following SAP egress QoS policy is applied to SAP on an FP3 with the egress:
sap-egress 10 create
queue 1 create
wred-queue policy "slope1" mode native
slope-usage exceed-low
exit
exit
the details of both the pool and queue can then be shown using this command:
*A:PE# show pools access-egress 2/1/2 service 1
===============================================================================
Pool Information
===============================================================================
Port : 2/1/2
Application : Acc-Egr Pool Name : default
To Next Page
Loading...
