Network Requirements

Introducing Campus Networks

Network Requirements

Intelligent Information Network

• Intelligent Information Network (IIN) integrates networked resources and information assets.

• IIN extends intelligence across multiple products and infrastructure layers.

• IIN actively participates in the delivery of services and applications.

• Three phases in building an IIN are:

– Integrated transport

– Integrated services

– Integrated applications

Cisco SONA Framework

• The Cisco Service-Oriented Network Architecture (SONA) is an architectural framework.

• SONA brings several advantages to enterprises:

– Outlines how enterprises can evolve toward the IIN

– Illustrates how to build integrated systems across a fully converged intelligent network

– Improves flexibility and increases efficiency

Cisco SONA Framework Layers

Cisco Enterprise Architecture

Nonhierarchical Network Devices

• Large collision domain

• Large broadcast domain

• High latency

• Difficult to troubleshoot

Issues• No traffic between VLANs

• Unbounded broadcast domain

• Servers not centrally located

Layer 2 Switching

• Hardware-based bridging

• Wire-speed performance

• Collision domain per port

• Traffic containment based on MAC address

Layer 3 Routing

• Single broadcast domain per interface

• ACLs can be applied between segments

Issues• High per-port cost

• Layer 3 processing required

• High latency over Layer 2 switching

Multilayer Switching

• Combined functionality

– Layer 2 switching

– Layer 3 switching

– Layer 4 switching

• Low latency

• High-speed scalability

Issues with Multilayer Switchesin a Nonhierarchical Network

• Single point of failure for Layer 2 and Layer 3

• Underutilization of hardware

• Spanning tree complexity

• Servers not centrally located

Hierarchical Campus Model

ECNM Functional Areas

Enterprise Composite Network Model

Modules in the Enterprise Campus

Campus Infrastructure Module

Switch Configuration Interfaces

• Two interfaces are used to configure Cisco Catalyst switches:

– Cisco Catalyst software

– Cisco IOS

• Cisco Catalyst software was traditionally used to configure Layer 2 parameters on the modular switches:

– Cisco Catalyst 4000, 5500, 6500 Series

– These switches now support Cisco IOS (native IOS)

• Cisco IOS software is standard for most other switches and for Layer 3 configuration on the modular switches.

Cisco Catalyst Software

• Cisco Catalyst software is used to configure Layer 2 parameters.

• Cisco Catalyst software configuration commands are prefaced with the keyword set.

– Console(enable) set port enable 3/5

• Layer 3 configuration is implemented on MSFC with the Cisco IOS interface.

• Some platforms can now use the Cisco IOS interface to configure both Layer 2 and Layer 3 (native IOS).

Cisco Catalyst 4000, 5500, and 6500 switches

Cisco IOS Interface

On most Catalyst switches, Cisco IOS interface is standard for• Layer 2 configuration

• Layer 3 configuration on multilayer switch

Summary

• The SONA framework guides the evolution of the enterprise network toward IIN.

• Cisco enterprise architecture with a hierarchical network model facilitates the deployment of converged networks.

• Nonhierarchical network designs do not scale and do not provide the required security necessary in a modern topology.

• Layer 2 networks do not provide adequate security or hierarchical networking.

• Router-based networks provide greater security and hierarchical networking; however, they can introduce latency issues.

Summary (Cont.)

• Multilayer switches combine both Layer 2 and Layer 3 functionality to support the modern campus network topology.

• Multilayer switches can be used in nonhierarchical networks; however, they will not perform at the optimal level.

• The enterprise composite model identifies the key components and logical design for a modern topology.

• Implementation of an ECNM provides a secure, robust network with high availability.

• The Campus infrastructure, as part of an ECNM, provides additional security and high availability at all levels of the campus.

• The two Cisco Catalyst switch interfaces have different features and different font.