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Monitoring CoS Forwarding Classes

Purpose

Use the monitoring functionality to view the current assignment of CoS forwarding classes to queue numbers on the system.

Action

To monitor CoS forwarding classes in the CLI, enter the following CLI command:

user@switch> show class-of-service forwarding-class

Meaning

Table 1 summarizes key output fields for CoS forwarding classes.

Table 1: Summary of Key CoS Forwarding Class Output Fields

Field	Values
Forwarding Class	Names of forwarding classes assigned to queue numbers. By default, the following unicast forwarding classes are assigned to queues 0, 3, 4, and 7, respectively: best-effort—Provides no special CoS handling of packets. Loss priority is typically not carried in a CoS value. fcoe—Provides guaranteed delivery for Fibre Channel over Ethernet (FCoE) traffic. no-loss—Provides guaranteed delivery for TCP lossless traffic network-control—Packets can be delayed but not dropped. By default, the following multidestination forwarding class is assigned to queue 8: mcast—Provides no special CoS handling of packets.
Queue	Queue number corresponding to the forwarding class name. By default, four queues (0, 3, 4, and 7) are assigned to unicast forwarding classes and one queue (8) is assigned to a multidestination forwarding class.
No-Loss	Packet drop attribute associated with each forwarding class: Disabled—The forwarding class is configured for lossy transport (packets might drop during periods of congestion) Enabled—The forwarding class is configured for lossless transport Note: To achieve lossless transport, you must ensure that priority-based flow control (PFC) and DCBX are properly configured on the lossless priority (IEEE 802.1p code point), and that sufficient port bandwidth is reserved for the lossless traffic flows.

Field

Values

Forwarding Class

Names of forwarding classes assigned to queue numbers. By default, the following unicast forwarding classes are assigned to queues 0, 3, 4, and 7, respectively:

best-effort—Provides no special CoS handling of packets. Loss priority is typically not carried in a CoS value.
fcoe—Provides guaranteed delivery for Fibre Channel over Ethernet (FCoE) traffic.
no-loss—Provides guaranteed delivery for TCP lossless traffic
network-control—Packets can be delayed but not dropped.

By default, the following multidestination forwarding class is assigned to queue 8:

mcast—Provides no special CoS handling of packets.

Queue

Queue number corresponding to the forwarding class name.

By default, four queues (0, 3, 4, and 7) are assigned to unicast forwarding classes and one queue (8) is assigned to a multidestination forwarding class.

No-Loss

Packet drop attribute associated with each forwarding class:

Disabled—The forwarding class is configured for lossy transport (packets might drop during periods of congestion)
Enabled—The forwarding class is configured for lossless transport
Note: To achieve lossless transport, you must ensure that priority-based flow control (PFC) and DCBX are properly configured on the lossless priority (IEEE 802.1p code point), and that sufficient port bandwidth is reserved for the lossless traffic flows.

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Monitoring CoS Forwarding Classes

Purpose

Action

Meaning

Related Documentation

Published: 2014-07-23

Supported Platforms

Related Documentation

Published: 2014-07-23