Switching

Chapter 1: Analyzing The Cisco Enterprise Campus Architecture

CCNP SWITCH: Implementing IP Switching

Course v6 Chapter # © 2007 – 2010, Cisco Systems, Inc. All rights reserved. Cisco Public

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Chapter 1 Objectives
 Describe common campus design options and how design choices affect implementation and support of a campus LAN.  Describe the access, distribution, and core layers. Describe small, medium, and large campus network designs.  Describe the prepare, plan, design, implement, operate, optimize (PPDIOO) methodology.  Describe the network lifecycle approach to campus design.

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Introduction to Enterprise Campus Network Design

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Enterprise Network
      Core (Backbone) Campus Data Center Branch WAN Internet Edge

Chapter # © 2007 – 2010, Cisco Systems, Inc. All rights reserved. Cisco Public

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Regulatory Standards (U.S.)
 There may be several legal regulations that have an impact on a network’s design.  US regulations on networks include:
• Health InsurancePortability and Accountability Act (HIPAA) • Sarbanes-Oxley Act • “Records to Be Preserved by Certain Exchange Members, Brokers and Dealers”: Securities and Exchange Commission (SEC) Rule 17a4

Chapter # © 2007 – 2010, Cisco Systems, Inc. All rights reserved. Cisco Public

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Campus Designs
 Modular - easily supports growth and change. Scaling the network is eased by adding new modules in lieu ofcomplete redesigns.  Resilient - proper high-availability (HA) characteristics result in near-100% uptime.  Flexible - change in business is a guarantee for any enterprise. These changes drive campus network requirements to adapt quickly.

Chapter # © 2007 – 2010, Cisco Systems, Inc. All rights reserved. Cisco Public

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Multilayer Switches in Campus Networks
 Hardware-based routingusing Application-Specific Integrated Circuits (ASICs)  RIP, OSPF, and EIGRP are supported  Layer 3 switching speeds approximate that of Layer 2 switches  Layer 4 and Layer 7 switching supported on some switches  Future: Pure Layer 3 environment leveraging inexpensive L3 access layer switches

Chapter # © 2007 – 2010, Cisco Systems, Inc. All rights reserved. Cisco Public

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Cisco Switches Catalyst 6500 Family – used in campus, data center, and core as well as WAN and branch
• Up to 13 slots and 16 10-Gigabit Ethernet interfaces • Redundant power supplies, fans, and supervisor engines • Runs Cisco IOS

 Catalyst 4500 Family – used in distribution layer and in collapsed core environments
• Up to 10 slots and several 10-Gigabit Ethernet interfaces • Runs Cisco IOS

Catalyst 3560 and 3750 Families – used in fixed-port scenarios at the access and distribution layers  Nexus 2000, 5000, and 7000 Families – NX-OS based modular data center switches

Chapter # © 2007 – 2010, Cisco Systems, Inc. All rights reserved. Cisco Public

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Multilayer Switching Miscellany
 ASIC-based (hardware) switching is supported even with QoS and ACLs, depending on the platform;6500 switches support hardware-based switching with much larger ACLs than 3560 switches.  ASICs on Catalyst switches work in tandem with ternary content addressable memory (TCAM) and packet-matching algorithms for high-speed switching.
Chapter # © 2007 – 2010, Cisco Systems, Inc. All rights reserved. Cisco Public

 Catalyst 6500 switches with a Supervisor Engine 720 and a Multilayer SwitchFeature Card (MSFC3) must software-switch all packets requiring Network Address Translation.  Unlike CPUs, ASICs scale in switching architectures. ASICs integrate onto individual line modules of Catalyst switches to hardware-switch packets in a distributed manner.
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Traffic Types
 Network Management – BPDU, CDP, SNMP, RMON, SSH traffic (for example); low bandwidth  IP Telephony – Signaling...