Cisco WS-X6416-GE-MT - Interface Module - Expansion Manual de usuario descargar pdf (Pagina 37)

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Cisco Catalyst OS Cisco IOS Software

set qos map 1p1q4t rx 2 1 cos 5

set qos map 1p2q2t tx 1 1 cos 0,1

set qos map 1p2q2t tx 3 1 cos 5

interface gigabitethernet 3/1

rcv-queue cos-map 2 1 5

wrr-queue cos-map 1 1 0 1

priority-queue cos-map 1 5

Queue Sizes

The total amount of buffer per port is a fixed quantity. However, the allocation of that packet buffer

per queue can be configured on most Ethernet ports. Specifically, the transmit buffer allocation

can be changed on the classic Fast Ethernet, any Gigabit Ethernet, and any 10 Gigabit Ethernet

line card. The receive buffer allocation is configurable on the fabric-enabled Fast Ethernet ports

(6548, 6524 line cards) and on the 10 Gigabit Ethernet ports (6501, 6502 line cards).

Cisco Catalyst OS Cisco IOS Software

set qos txq-ratio 1p2q2t 10 90

set qos rxq-ratio 1p1q0t 10 90

interface gigabitethernet 3/1

wrr-queue queue-limit 10 90

interface fastethernet 4/1

rcv-queue queue-limit 10 90

WRR Scheduling

The Weighted Round Robin (WRR) scheduling mechanism is used to prioritize traffic as it exits an

egress port. The prioritization is based on the relative weighting of each of the participating

queues, so that traffic in a higher priority queue will be serviced before traffic in a low priority

queue. The WRR scheduling feature is supported on the transmit queues for all Ethernet line

cards. An example (for Gigabit Ethernet ports) is shown below. As with the CoS-to-queue

mapping, the WRR scheduling is configured on a per-ASIC basis.

Cisco Catalyst OS Cisco IOS Software

set qos wrr 1p2q2t 30 70 interface gigabitethernet 3/1

wrr-queue bandwidth 30 70

Configuring QoS Policies

The configuration of QoS policies differs significantly between Cisco IOS Software and the Cisco

Catalyst OS. For the Cisco Catalyst OS, a QoS ACL statement is used to configure all match and

action parameters for marking and policing. Cisco IOS Software QoS supports classification,

marking, and policing using the Modular QoS CLI (MQC) syntax.

A Cisco IOS Software policy uses traffic classes (with the class-map statement) to identify

interesting traffic. These traffic classes can be defined for different types of traffic flows; for

example, a user could have a different class for IP traffic, IPX traffic, and MAC traffic. Each traffic

class uses Cisco IOS Software based ACLs and/or class match statements to identify traffic. The

policy-map includes the desired action for the matched traffic (mark, police, trust, etc). The policy

defined by a policy-map is mapped to an interface using the service-policy command.

Examples of both are included below.

Trust with an ACL

As an alternative to setting the trust state for all traffic on a port (as described above), a QoS policy

can be created to trust traffic that matches a specific QoS ACL. This functionality is available in

both the Cisco Catalyst OS and Cisco IOS Software. As such, it is a straightforward example of the

configuration differences between the Cisco Catalyst OS QoS ACL syntax and the Cisco IOS

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