Introducing Campus Networks Network Requirements Introducing Campus Networks

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

Layer 2 Switching Issues Hardware-based bridging Wire-speed performance Collision domain per port Traffic containment based on MAC address Issues No traffic between VLANs Unbounded broadcast domain Servers not centrally located

Layer 3 Routing Issues 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 Low latency High-speed scalability

Issues with Multilayer Switches in 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.