Feature History For 4-Level Scheduler - Cisco 10000 Series Configuration Manual

Quality of service configuration guide

Hide thumbs Also See for 10000 Series:

Table of Contents

Hierarchical Scheduling and Queuing

The subinterface layer (lower logical) supports the bandwidth remaining ratio command for Ethernet

VLANs and ATM VCs, and the weight command for ATM VCs.

The 4-level scheduler provides bandwidth sharing and maximum rate shaping among the sessions at the

session layer (upper logical) and at the same time among the VLANs and VCs at the subinterface layer

(lower logical). The scheduler supports the simultaneous oversubscription of the sessions on a VLAN or

VC and of the VLAN or VC on a physical port.

During congestion, the 4-level scheduler does the following:

The 4-level scheduler is disabled by default.

The router does not convert 3-level queuing hierarchies to 4-level hierarchies. Instead, if 3 levels are

needed, then the router uses only 3 levels.

For information about the 3-level scheduler, see the

Scheduler" section on page

Feature History for 4-Level Scheduler

Cisco IOS Release

Release 12.2(33)XNE1

Physical layer (Ethernet interface or ATM virtual path)—A real-time calendar ensures that the

maximum rate for the class and the logical interface are not exceeded.

Shares bandwidth fairly at the VLAN, QinQ, or VC level.

Shares the distributed VLAN, QinQ, or VC bandwidth fairly among the sessions of that VLAN,

QinQ, or VC.

Shares the bandwidth distributed to a session fairly among the class queues of that session.

"MQC Hierarchical Queuing with 3-Level

This feature was introduced on the Cisco 10000 series

router for the PRE3 and PRE4.

Cisco 10000 Series Router Quality of Service Configuration Guide

4-Level Scheduler

PRE Required

Table of Contents