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
• 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
• 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 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.