Cisco Catalyst 4500 Series Configuration Guide

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Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
OL-25340-01
Chapter 1 Product Overview
Layer 3 Software Features
Bidirectional Forwarding Detection (BFD) protocol. BFD is a detection protocol designed to provide
fast forwarding path failure detection times for all media types, encapsulations, topologies, and routing
protocols. It includes a description of how to configure multihop BFD sessions. BFD provides a
consistent failure detection method for network administrators in addition to fast forwarding path failure
detection.
For information on configuring BFD, see Chapter 37, “Configuring Bidirection Forwarding Detection.”
Cisco Express Forwarding
Cisco Express Forwarding (CEF) is an advanced Layer 3 IP-switching technology. CEF optimizes
network performance and scalability in networks with large and dynamic traffic patterns, such as the
Internet, and on networks that use intensive web-based applications or interactive sessions. Although
you can use CEF in any part of a network, it is designed for high-performance, highly resilient Layer 3
IP-backbone switching.
For information on configuring CEF, see Chapter 33, “Configuring Cisco Express Forwarding.”
EIGRP Stub Routing
The EIGRP stub routing feature, available in all images, reduces resource utilization by moving routed
traffic closer to the end user.
The IP base image contains only EIGRP stub routing. The IP services image contains complete EIGRP
routing.
In a network using EIGRP stub routing, the only route for IP traffic to follow to the user is through a
switch that is configured with EIGRP stub routing. The switch sends the routed traffic to interfaces that
are configured as user interfaces or are connected to other devices.
For information on configuring EIGRP Stub Routing, see Chapter 32, “Configuring Layer 3 Interfaces.”
Enhanced Object Tracking
Before the introduction of the Enhanced Object Tracking feature, the Hot Standby Router Protocol
(HSRP) had a simple tracking mechanism that allowed you to track the interface line-protocol state only.
If the line-protocol state of the interface went down, the HSRP priority of the router was reduced,
allowing another HSRP router with a higher priority to become active.
The Enhanced Object Tracking (EOT) feature separates the tracking mechanism from HSRP and creates
a separate standalone tracking process that can be used by other Cisco IOS processes as well as HSRP.
This feature allows tracking of other objects in addition to the interface line-protocol state.
A client process, such as HSRP, Virtual Router Redundancy Protocol (VRRP), or Gateway Load
Balancing Protocol (GLBP), can now register its interest in tracking objects and then be notified when
the tracked object changes state.
For details on EOT, refer to this URL:
For platform specific information on Enhanced Object Tracking, see Chapter 57, “Configuring
Enhanced Object Tracking.”
For more detailed information on Enhanced Object Tracking, see the URL:
http://www.cisco.com/en/US/docs/ios-xml/ios/ipapp/configuration/12-4t/iap-eot.html

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E