Introducing Campus Networks

1
Network Requirements

• Introducing Campus Networks

2
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

3
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

4
Cisco SONA Framework Layers
5
Cisco Enterprise Architecture
6
Nonhierarchical Network Devices

• Large collision domain
• Large broadcast domain
• High latency
• Difficult to troubleshoot

7
Layer 2 Switching

• 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

8
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

9
Multilayer Switching

• Combined functionality
• Layer 2 switching
• Layer 3 switching
• Layer 4 switching
• Low latency
• High-speed scalability

10
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

11
Hierarchical Campus Model
12
ECNM Functional Areas
13
Enterprise Composite Network Model
14
Modules in the Enterprise Campus
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Campus Infrastructure Module
16
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.

17
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
18
Cisco IOS Interface

• On most Catalyst switches, Cisco IOS interface is
  standard for
• Layer 2 configuration
• Layer 3 configuration on multilayer switch

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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.

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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.

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