Configuring Policy Class Of Service (Cos); Using Port-Based Or Policy-Based Cos Settings; About Policy-Based Cos Default And User-Defined Configurations; Configuring User-Defined Cos - Enterasys Matrix DFE-Gold Series Configuration Manual

clear policy port-hit

Configuring Policy Class of Service (CoS)

Using Port-Based or Policy-Based CoS Settings

The Enterasys Matrix Series device supports Class of Service (CoS), which allows you to assign
mission‐critical data to higher priority through the device by delaying less critical traffic during
periods of congestion. The higher priority traffic through the device is serviced first before lower
priority traffic. The Class of Service capability of the device is implemented by a priority queueing
mechanism. Class of Service is based on the IEEE 802.1D (802.1p) standard specification, and
allows you to define eight priorities (0‐7, with 7 granted highest priority) and, depending on port
type, up to 16 transmit queues (0‐15) of traffic for each port.
Enterasys Networks' enhanced CoS implementation allows you to use the following methods to
configure Class of Service on the Enterasys Matrix Series device:
• Allowing the device to automatically assign policy‐based inbound rate limiters and transmit
queues as described in this section.
• Configuring transmit queueing and rate limiting on a per‐port basis as described in
Chapter
By defult, policy‐based CoS is disabled on the device, and default or user‐assigned port‐based
802.1D (802.1p) settings are used to determine transmit queues and traffic rate limiting. When
policy‐based CoS is enabled, the default and user‐assigned settings will override port‐based
settings described in Chapter

About Policy-Based CoS Default and User-Defined Configurations

Once enabled using the set cos state command as described in "set cos state" on page 8‐23, the
policy‐based CoS function provides the following default configuration:
• Transmit queues (TXQ) — A strict‐priority queueing mechanism which gives higher priority
queues absolute preferential treatment over low priority queues. This ensures the transmit
port does not serve a transmit queue unless all higher priority queues are empty. As described
previously in this section, eight priority designations and, depending on port type, up to 16
four transmit queues are defined for each port.
• Inbound rate limiting (IRL) — No inbound rate limiters are configured.
You can add to these default configurations by defining new port groupings, and assigning
inbound rate limiters or transmit queues and priorities. Whether you are specifying IRL or TXQ
parameters, the process for user‐defined CoS configuration involves the following steps and
associated commands listed in Table
Table 8-4 Configuring User-Defined CoS
To do this....
Enable CoS.
If desired, create new or change existing CoS port configurations.
Note: It is recommended that you use Enterasys NetSight Policy Manager as an alternative to CLI
for configuring policy-based CoS on the Enterasys Matrix Series devices.
22.
22.
8‐4.
Enterasys Matrix DFE-Gold Series Configuration Guide 8-21
Configuring Policy Class of Service (CoS)
Use these commands...
set cos state
set cos port-config irl
set cos port config txq