Справочник Пользователя для Cisco IOS Software for Supervisor Engine 6-E S45EIPBK9-12240SG=
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Product Bulletin
All contents are Copyright © 1992–2007 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.
Page 4 of 9
Storm Control: Per-Port Multicast Suppression
A storm event occurs when a large number of broadcast and/or multicast packets inundate a
network to degrade its overall performance, preventing control packets from being forwarded. The
storm control feature detects and reacts to such an event so that forwarding of data and control
packets is not affected. This is achieved by monitoring the number of packets received on a port. If
this count exceeds a configured threshold, the feature takes action to control the flood of packets.
Cisco IOS Software Release 12.2(40)SG allows suppression of broadcast and multicast traffic on
a per-port basis.
Cisco Modular QoS Command-Line-Interface
Cisco Modular QoS CLI (MQC) is the framework used to implement Cisco IOS Software QoS.
MQC allows the user to define a traffic class, create a traffic policy (containing the QoS feature to
be applied to the traffic class), and attach the traffic policy to an interface. MQC is a cross-
Cisco[[NOTE: Per Cisco style, Cisco cannot be combined with another term using a hyphen, slash,
or other connector. Please rephrase “cross-Cisco.”]] baseline that provides a consistent syntax and
behavior of QoS features across multiple product families. Cisco IOS Software Release
12.2(40)SG complies to MQC for configuration of QoS features on the Supervisor Engine 6-E.
MQC enables rapid deployment of new features and technology innovations and facilitates the
management of network performance with respect to bandwidth, delay, jitter, and packet loss,
enhancing the performance of mission-critical business applications. The rich and advanced QoS
features that are supported as part of the Supervisor Engine 6-E are enabled using Cisco MQC.
Two-Rate Three-Color Policing
The Two-Rate Three-Color Policing feature limits the input or output transmission rate of a class of
traffic based on user-defined criteria and marks or colors packets by setting the applicable
differentiated services code point (DSCP) values. This feature is often configured on the interfaces
at the edge of a network to limit the rate of traffic entering or leaving the network. Using this
feature, traffic that conforms to user-defined criteria can be sent through the interfaces, while traffic
that exceeds or violates these criteria is sent out with a decreased priority setting or even dropped.
Table 2.
New Features in 12.2(40)SG—Classic Supervisors and Supervisor Engine 6-E
Feature
Classic Supervisors
Supervisor Engine 6-E
Dynamic Multi-Protocol Ternary
Content Addressable Memory
Content Addressable Memory
No
Yes
Service-Aware Resource Allocation
No
Yes
uRPF Strict Mode
No
Yes
IPv6 Forwarding in Hardware
No
Yes
Enhanced Interior Gateway Routing
Protocol IPv6 Support
Protocol IPv6 Support
No
Yes
IPv6 Multicast Listener Discovery
Snooping
Snooping
No
Yes
Gateway Load Balancing Protocol
Yes
Yes
Support for TwinGig Converter
Module
Module
No
Yes
Robust and Flexible File Management
System (FAT File System)
System (FAT File System)
No
Yes
Storm Control: Per-Port Multicast
Suppression
Suppression
No
Yes