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Stateful switchover dramatically increases system and network availability while maintaining continuous network access and services. Voice-

over-IP calls do not drop, video multicast does not freeze, and user access security does not disappear. Stateful switchover is typically deployed

in the network access layer to enhance system availability with a single chassis.

Non-Stop Forwarding Awareness

The Non-Stop Forwarding Awareness (NSF-aware) feature helps NSF-capable switches and routers perform nonstop packet forwarding during

their switchovers. It enables neighboring NSF-capable devices to maintain the integrity and accuracy of Layer 3 routing protocol databases.

Supported routing protocols include Open Shortest Path First (OSPF), Intermediate System-to-Intermediate System (IS-IS), Enhanced Interior

Gateway Routing Protocol (EIGRP), and Border Gateway Protocol (BGP). NSF-aware is fully integrated with Cisco IOS Software Release

12.2(20)EWA and is enabled by default. It requires no configuration for EIGRP/OSPF/IS-IS protocols. It is compatible with non-NSF-aware

and non-NSF-capable neighbors.

802.1x with Voice VLAN ID

802.1x with Voice VLAN ID (VVID) allows an IP phone without 802.1x supplicant capability to operate through an 802.1x port. When a

Cisco IP phone is recognized through Cisco Discovery Protocol, the switch allows phone traffic on the auxiliary VLAN without 802.1x

authentication. If a workstation is connected to the Cisco IP phone, standard 802.1x authentication is performed for the workstation. 802.1x

VVID enables uniform 802.1x switch port configuration, with or without IP phones.

Forced 10/100 Autonegotiation

The forced 10/100 autonegotiation feature provides an option to limit interface speed autonegotiation to 100 Mbps or less on a

10/100/1000BASE-T port. It offers investment protection for Cisco Catalyst 4500 Series 10/100/1000 and 10/100/1000 PoE modules. The wire

speed 1000 Mbps can be enabled or disabled through switch port configuration changes. Customers can deploy 10/100/1000 modules today and

selectively enable 1000-Mbps wire speed in the network for design, rollout, or other business reasons.

SUPPORT

Cisco IOS Software Release 12.2(20)EWA follows the standard Cisco Systems

support policy, available at:

http://www.cisco.com/en/US/products/products_end-of-life_policy.html

For more information about the Cisco Catalyst 4500 Series, visit: http://www.cisco.com/univercd/cc/td/doc/product/lan/cat4000/index.htm

MIGRATION PATHS

Cisco IOS Software Release 12.2EW train offers the latest features for the Cisco Catalyst 4500 Series. Customers with Cisco Catalyst 4500

Series switches that need the latest hardware support and software features should migrate to Cisco IOS Software Release 12.2(20)EWA.

Cisco IOS Software Release 12.1(19)E1 and all subsequent 12.1E maintenance releases have only the feature set based on Cisco IOS Software

Release 12.1(12c)EW1 for the Cisco Catalyst 4500 Series. Customers with Cisco Catalyst 4500 Series switches who require the stability of a

general deployment release could stay with Cisco IOS Software Release 12.1E train.

Cisco IOS Software Release 12.2(18)EW1 and all subsequent 12.2(18)EW maintenance releases have only the feature set based on Cisco IOS

Software Release 12.2(18)EW for the Cisco Catalyst 4500 Series. Customers with Cisco Catalyst 4500 Series switches who require the stability

of a bug fix maintenance release could stay with the Cisco IOS Software Release 12.2(18)EW maintenance releases.

PRODUCT NUMBERS

Tables 1 and 2 provide product numbers and ordering information for Cisco IOS Software Release 12.2(20)EWA and for supporting hardware.

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Cisco S4KL3EK9-12220EWA= Datasheet Page 2