Service Manual

The maximum number of ports, including fan-out, supported is 104 and the maximum number of queues supported is 21. Analyzing
and evaluating buer statistics enables monitoring of resources and tuning of allocation of buers. Max Use count mode provides
the maximum values of counters accumulated over a period of time. Current Use count mode enables you to obtain a snapshot of
the counters, at a particular time, using a triggering utility. The trigger can either be software-based or based on a predetermined
threshold event. Software-based triggers are supported, which are the values derived from the show command output in the Max
Use count mode. In Dell Networking OS Release 9.3(0.0), only the Max Use count mode of operation is supported for the
computation of maximum counter values.
Depending on the buer space statistical values that you can obtain, you can modify the settings for buer area to achieve
enhanced reliability and eciency in the handling of packets. This evaluation and administration of buer statistics is useful and
important in deployments that experience congestion frequently. The receive buer must be large enough to save all data that is
received when the system processes a PFC PAUSE frame.
You can use the service-class buffer shared-threshold-weight queue0 ... queue7 number command in
Interface Conguration mode to specify the threshold weight for the shared buer for each of the queues per port.
1. Create a 10-Gigabit Ethernet interface.
Dell(conf)#interface TenGigabitEthernet 1/8/1
2. Congure the threshold weight of the shared buer for the queues you want. In this example, this setting is congured for
queues 5 and 7.
Dell(conf-if-te-1/8/1)#Service-class buffer shared-threshold-weight queue5 4 queue7 6
Enabling Buer Statistics Tracking
This functionality is supported on the platform.
You can enable the tracking of statistical values of buer spaces at a global level. The buer statistics tracking utility operates in the
max use count mode that enables the collection of maximum values of counters.
To congure the buer statistics tracking utility, perform the following step:
Enable the buer statistics tracking utility and enter the Buer Statistics Snapshot conguration mode.
CONFIGURATION mode
Dell(conf)#buffer-stats-snapshot
Dell(conf)#no disable
You must enable this utility to be able to congure the parameters for buer statistics tracking. By default, buer statistics
tracking is disabled.
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Quality of Service (QoS)