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Cisco IOS Software
Modeled after the Cisco 2500 and 3600, the Cisco 2600 Series supports a full range of Cisco Internetworking
Operating System, (IOS) features. These feature sets include a wide variety of intranet, multiprotocol, QoS, and
legacy IBM applications in use today. The Cisco 2600 Series offers several base protocol feature sets and a
combination of premium feature options including the Plus, encryption and firewall feature sets.
The available IOS feature sets are:
•IP
• IP/IPX/AppleTalk/DEC
• Remote Access Services
• Enterprise
• Enterprise APPN
• Telco
The Base feature sets support popular protocols and standards such as network address translation (NAT), open
shortest path first (OSPF), Border Gateway Protocol (BGP), Remote Access Dial-In User Service (RADIUS),
IP Multicast, remote monitoring (RMON), and WAN optimization features (such as Bandwidth on Demand;
Custom, Priority and WFQ, Dial Back-up and RSVP).
Some base feature sets are offered in combination with premium capabilities found in the Plus, Firewall and
Encryption feature sets. The Plus feature sets contain additional value-added features such as, L2TP, L2F, Voice/Data
integration, legacy mainframe protocols, DLSw, Asynchronous Transfer Mode (ATM), virtual LANs (VLANs),
Netflow, etc. Additional premium security oriented features include IPSec, and 3DES encryption as well as Firewall
capabilities.
The Cisco IOS
®
Telco feature set is a specialized image for service providers. This optimized Cisco IOS image
supports IP, X.25/PAD, X.25/IP protocol translations, and all OSI routing and protocol translation features. This
image offers the service provider the critical network-management features required to manage a diverse network
topology. The Cisco IOS Telco image enhances memory utilization by stripping away underutilized features such as
Appletalk and Banion Vines. This Cisco IOS image is specific to the Cisco DCN environment, and is not available
with Cisco IOS 12.2.2T.
The Enterprise Plus feature set is the Cisco comprehensive offering of protocols, standards, and value-add
networking capabilities. This feature set includes a broad array of QoS, LAN and WAN protocols including legacy
mainframe protocols, protocol translation, remote node and terminal services. Additionally, the Enterprise Plus
feature set includes a number of telco-oriented features, such as OSI and X.25 Pad, IP/X.25 protocol translation,
request for comment (RFC) 1613-XOT, TL1 transport and TARP Storm Avoidance.
The Remote Access Services feature set includes various management, multicast, security (excluding encryption),
protocoltranslation, remote node and terminal servicesand some LAN and WAN service and optimization protocols
but excludes some of the capabilities found in the Enterprise Plus feature set.
A more detailed list of features can be found in the Cisco 2600 IOS release notes. The memory requirements for a
given feature set can be found in the Cisco 2600 software features and memory requirements product bulletin. Some
Cisco IOS feature sets require additional memory. Refer to Table 8 for memory default configurations.
