Cisco WS-X6248-RJ-45 - Catalyst 6000 Expansion Module Manual de usuario descargar pdf (Pagina 29)

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Conﬁguring Interface QoS

Trust State

Ports can be set to trust certain ﬁelds such as CoS, IP-precedence, or DSCP in the incoming frames. The following is

a sample conﬁguration:

Cisco IOS Software does not support the Extended Trust feature for differentiating IP Phone voice trafﬁc and

workstation data trafﬁc.

Default Port CoS

You can set a default CoS value for all trafﬁc entering a particular port in both operating systems. The syntax is

provided here:

Port QoS Mode

QoS policies can be applied on either a port or a VLAN basis. By default, QoS functionality is port based. In this

case, all QoS policies should be applied to a particular port. Policies that are applied to a VLAN will not affect trafﬁc

that is ingress on a port which is conﬁgured as port-based. If a policy is mapped to a VLAN, you must inform the

interface that QoS is VLAN based for each port in the VLAN to which the VLAN policy is applicable. The mls qos

vlan-based command on the intended interfaces does this, as seen below.

CoS-to-Queue Mapping

The mapping of CoS values to queues/thresholds in the standard receive and transmit queues is discussed next. In

Cisco IOS, the rcv-queue keyword is used for standard receive queue conﬁguration, the wrr-queue keyword is used

for round-robin transmit queues, and the priority-queue keyword is used for priority queues. In the CatOS

implementation, the CoS-to-queue mapping is conﬁgured per queue type (for example, all 1p2q2t ports will have the

same conﬁguration). In the IOS implementation, the CoS-to-queue mapping is conﬁgured per interface and the

conﬁguration changes are implemented on all ports that are managed by the same port ASIC. (ASIC to port layout

CatOS Cisco IOS Software

set port qos 3/1 trust trust-cos interface gigabitethernet 3/1

mls qos trust cos

CatOS Cisco IOS Software

set port qos 3/1 cos 3 interface gigabitethernet 3/1

mls qos cos 3

CatOS Cisco IOS Software

set port qos 3/1 vlan-based interface gigabitethernet 3/1

mls qos vlan-based

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Cisco WS-X6248-RJ-45 - Catalyst 6000 Expansion Module Manual de usuario Pagina 29