Per-Port Storm-Control; Port Security; Ethernet Switching In Cisco Avvid Architecture - Cisco NM-8B-U - HW ROUTERS L-M User Manual

Feature Overview

Per-Port Storm-Control

A packet storm occurs when a large number of broadcast, unicast, or multicast packets are received on
a port. Forwarding these packets can cause the network to slow down or to time out. By default, per-port
storm-control is disabled.
Per-port storm-control uses rising and falling thresholds to block and then restore the forwarding of
broadcast, unicast, or multicast packets. You can also set the switch to shut down the port when the rising
threshold is reached.
Per-port storm-control uses a bandwidth-based method to measure traffic activity. The thresholds are
expressed as a percentage of the total available bandwidth that can be used by the broadcast, multicast,
or unicast traffic.
The rising threshold is the percentage of total available bandwidth associated with multicast, broadcast,
or unicast traffic before forwarding is blocked. The falling threshold is the percentage of total available
bandwidth below which the switch resumes normal forwarding. In general, the higher the level, the less
effective the protection against broadcast storms.
Per-port storm control and global storm-control cannot be enabled at the same time.

Port Security

You can use port security to block input to an Ethernet, Fast Ethernet, or Gigabit Ethernet port when the
MAC address of the station attempting to access the port is different from any of the MAC addresses
specified for that port. Alternatively, you can use port security to filter traffic destined to or received from
a specific host based on the host MAC address.

Ethernet Switching in Cisco AVVID Architecture

This section describes the Ethernet switching capabilities of the Ethernet switch network module, which
is designed to work as part of the Cisco Architecture for Voice, Video, and Integrated Data (AVVID)
solution.
The section outlines some of the concepts involved in configuring Ethernet ports on the Ethernet switch
network module to support Cisco IP phones in a branch office on your network. Also included is a
section describing the default settings on the Ethernet switch network module.
The following topics are included:
•
•
Configuring the Ethernet Switch Network Module for Cisco AVVID/IP Telephony
The Ethernet switch network module has sixteen 10/100 switched Ethernet ports with integrated inline
power and QoS features that make it an ideal choice for extending Cisco AVVID (Architecture for Voice,
Video and Integrated Data) based voice-over-IP (VoIP) networks to small branch offices.
As an access gateway switch, the Ethernet switch network module can be deployed as a component of a
centralized call-processing network using a centrally deployed Cisco CallManager (CCM). Instead of
deploying and managing key systems or PBXs in small branch offices, applications are centrally located
at the corporate headquarters or data center and are accessed via the IP WAN.
Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ
40
16- and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series
Configuring the Ethernet Switch Network Module for Cisco AVVID/IP Telephony, page 40
Default Switch Configuration, page 41