Administrator Guide

!
class-map match-any class_dscp_40
match ip access-group dscp_40_non_ecn set-color yellow
match ip access-group dscp_40_ecn
!
class-map match-any class_dscp_50
match ip access-group dscp_50_non_ecn set-color yellow
match ip access-group dscp_50_ecn
!
policy-map-input pmap_dscp_40_50
service-queue 2 class-map class_dscp_40
service-queue 3 class-map class_dscp_50
Applying Layer 2 Match Criteria on a Layer 3
Interface
To process Layer 3 packets that contain a dot1p (IEEE 802.1p) VLAN Layer 2 header, configure VLAN tags on a Layer 3 port interface
which is configured with an IP address but has no VLAN associated with it. You can also configure a VLAN sub-interface on the port
interface and apply a policy map that classifies packets using the dot1p VLAN ID.
To apply an input policy map with Layer 2 match criteria to a Layer 3 port interface, use the service-policy input policy-name
layer 2 command in Interface configuration mode.
To apply a Layer 2 policy on a Layer 3 interface:
1. Configure an interface with an IP address or a VLAN sub-interface
CONFIGURATION mode
DellEMC(conf)# interface fo 1/49/1
INTERFACE mode
DellEMC(conf-if-fo-1/49/1)# ip address 90.1.1.1/16
2. Configure a Layer 2 QoS policy with Layer 2 (Dot1p or source MAC-based) match criteria.
CONFIGURATION mode
DellEMC(conf)# policy-map-input l2p layer2
3. Apply the Layer 2 policy on a Layer 3 interface.
INTERFACE mode
DellEMC(conf-if-fo-1/49/1)# service-policy input l2p layer2
Managing Hardware Buffer Statistics
The memory management unit (MMU) is 12.2 MB in size. It contains approximately 60,000 cells, each of which is 208 bytes in size. MMU
also has another portion of 3 MB allocated to it. The entire MMU space is shared across a maximum of 104 logical ports to support the
egress admission-control functionality to implement scheduling and shaping on per-port and per-queue levels. Also, the MMU buffer cells
can be used by each port or queue either as a static partition or as a dynamic partition. With dynamic mode, you can specify the
percentage of available buffer that is utilized by a queue. This dynamic partition or block is set to be two-thirds of the available buffers for
all unicast queues and one-fifth of the available buffers for all multicast queues on these platforms.
The maximum number of ports, including fan-out, supported is 104 and the maximum number of queues supported is 21. Analyzing and
evaluating buffer statistics enables monitoring of resources and tuning of allocation of buffers. 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 EMC 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 buffer space statistical values that you can obtain, you can modify the settings for buffer area to achieve enhanced
reliability and efficiency in the handling of packets. This evaluation and administration of buffer statistics is useful and important in
deployments that experience congestion frequently. The receive buffer 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
Configuration mode to specify the threshold weight for the shared buffer for each of the queues per port.
Quality of Service (QoS)
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