Cisco Catalyst 4500 Series, Software Configuration Manual

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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 1 Product Overview
Layer 3 Software Features
For information on configuring EIGRP Stub Routing, see Chapter 35, “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 69, “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
GLBP
The Gateway Load Balancing Protocol (GLBP) feature provides automatic router backup for IP hosts
configured with a single default gateway on a LAN. Multiple first hop routers on the LAN combine to
offer a single virtual first hop IP router while sharing the IP packet forwarding load. GLBP devices share
packet-forwarding responsibilities, optimizing resource usage, thereby reducing costs. Other routers on
the LAN may act as redundant GLBP routers that will become active if any of the existing forwarding
routers fail. This improves the resiliency of the network and reduces administrative burden.
For details on GLBP, refer to this URL:
http://www.cisco.com/en/US/docs/ios/12_2t/12_2t15/feature/guide/ft_glbp.html
Cisco IOS XE IP Application Services Features in Cisco IOS XE 3.1.0SG
This section list the IP Application Services software features that are supported in Cisco IOS XE
3.1.0SG. Links to the feature documentation are included.
Feature guides may contain information about more than one feature. To find information about a
specific feature within a feature guide, see the Feature Information table at the end of the guide.
Feature guides document features that are supported on many different software releases and platforms.
Your Cisco software release or platform may not support all the features documented in a feature guide.
See the Feature Information table at the end of the feature guide for information about which features in
that guide are supported in your software release. Use Cisco Feature Navigator to find information about
platform support and Cisco software image support. To access Cisco Feature Navigator, go to
http://www.cisco.com/go/cfn . An account on Cisco.com is not required.