Addendum

2. Configure the threshold weight of the shared buffer for the queues you want. In this example, this
setting is configured for queues 5 and 7.
Dell(conf-if-te-0/8)#Service-class buffer shared-threshold-weight queue5 4
queue7 6
Enabling Buffer Statistics Tracking
This functionality is supported on the S6000 platform.
You can enable the tracking mechanism for statistical values of buffer spaces at a global level to be
applicable throughout the system. By default, this capability to monitor buffer statistics is disabled. The
buffer statistics tracking utility operates in the max use count mode that enables the collection of
maximum values of counters.
To configure the buffer statistics tracking utility, perform the following:
Enable the buffer statistics tracking utility and enter the Buffer Statistics Snapshot configuration
mode.
CONFIGURATION mode
FTOS(conf)#buffer-stats-snapshot
FTOS(conf)#no disable
You must enable this utility to be able to configure the parameters for buffer statistics tracking. By
default, buffer statistics tracking is disabled.
Classifying Packets Based on a Combination of DSCP
Code Points and VLAN IDs
This functionality is supported on the S4810, S4820T, Z9000, and MXL platforms.
You can configure a classifier map that contains both the DSCP and MAC VLAN IDs as parameters for
performing a filtering of packets that are received before they are forwarded or dropped. You can now
specify both DSCP—IP packet classification (Layer 3 headers) and Dot1p—(IEEE 802.1p) Packet
classification (Layer 2 headers) as match criteria in a Layer 3 class map.
The type of the class map is determined during the creation of a class map. In releases of Dell Networking
OS earlier than Release 9.2.0.0, you can configure only dot1p value as the filter criterion in Layer 2 class
maps and DSCP value as the filter parameter in Layer 3 class maps. Classifying packets using both the
Layer 2 attribute, dot1p value or MAC VLAN, in a Layer 2 class map and the Layer 3 attribute, DSCP value,
in a Layer 3 class map is also possible. However, it was not possible to configure both dot1p or MAC
VLAN, and DSCP values in the same L2 or L3 class map.
All class maps are Layer 3 by default. You can now configure a Layer 3 class map to differentiate traffic
according to the IP VLAN value and the DSCP value. You can use the match ip vlan vlan-id
command in Class Map Input Configuration mode to specify a match criterion for a class map based on a
VLAN ID. You can attach this class map with a policy map, and associate the policy map with a service
queue. When you link class-maps to queues using the service-queue command, Dell Networking OS
matches the class-maps according to queue priority (queue numbers closer to 0 have lower priorities).
Quality of Service (QoS)
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