Ingress Buffer Policy; Egress Queue Bandwidth Allocation; Guidelines And Limitations - Cisco Nexus 7000 Series Configuration Manual

Ingress Buffer Policy

• system-q2
• system-q3
• system-q-default
The COS value indicates the Data Centre Ethernet (DCE) cos2q mapping of the active QoS network. The
default COS value allocation for each system-defined queue is as follows:
The table below describes the system-defined queues that you can use to perform cos2q fabric mapping.
Table 29: System-Defined Queue Types
Queue Type
system-pq1
system-q2
system-q3
system-q-default
For information about configuring cos2q fabric mapping, see the "Configuring Cos2q Fabric Mapping" section.
Ingress Buffer Policy
In the ingress direction, the queue limit for the system-q-default queue can be configured for burst-optimized,
default, mesh-optimized, or percent.
For information about configuring ingress buffer policy for policy maps, see the "Configuring Ingress Buffer
Policy" section.

Egress Queue Bandwidth Allocation

In the egress direction, priority and bandwidth can be configured for the system-defined queues. Only the
system-pq1 queue can take the priority. If system-pq1 is configured for priority, the remaining 3 system queues
can be configured based on bandwidth percentage. If system-pq1 is not configured for priority, all 4
system-defined queues share the bandwidth configured for each.
For information about configuring egress queue bandwidth allocation for policy maps, see the "Configuring
Egress Queue Bandwidth Allocation" section.

Guidelines and Limitations

• When you are working with fabric QoS mapping, all the ports on M Series modules much be allocated
• M3 modules do not support fabric QoS mapping.
Cisco Nexus 7000 Series NX-OS Quality of Service Configuration Guide
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to the default VDC.
Configuring Fabric QoS Mapping
Default COS Value
5,6,7
3,4
2
0,1