Intro to Switching Lecture # 3 Hassan Shuja 03/14/2006

Switching Communication Closets Communication Closets – Ethernet has limits of 300 feet Wiring runs longer than 300 feet could cause service failures Wiring runs longer than 300 feet could cause service failures

Switching Layers Access Layer Access Layer –This is the bottom layer of the 3 layer network design –Users are connected at this layer –Collision domains can be limited through VLANs Distribution Layer Distribution Layer –Routing –Packet Filtering –QOS

Switching Layers Access to Distribution Access to Distribution

Switching Layer Core Layer Core Layer – High speed data transfers and reliability

Switching Equipment Cisco Switches Cisco Switches –Cisco switches can be modular in the number of ports they allow or non-modular Non-Modular come in different sizes but the sizes are fixed and cannot be expanded Non-Modular come in different sizes but the sizes are fixed and cannot be expanded – Non-Modular Models Non-Modular Models –Catalyst 29XX, Catalyst 3500, Catalyst 3560, Catalyst 3750 Modular Models Modular Models –Catalyst 4500, Catalyst 6500

Cisco Switches Non-Modular Switches Non-Modular Switches – Catalyst 2950 – 24 & 48 ports – Catalyst 3560

Cisco Switches Modular Switches Modular Switches –Catalyst 4500 – Can be built with 3, 6, 7, or 10 modules –Catalyst 6500 – Can be built with 3, 4, 6, 9, or 13 modules

Switching Technology Virtual Area LAN Network (VLAN) Virtual Area LAN Network (VLAN) –A LAN not restricted by physical location Can be developed based on more than physical location Can be developed based on more than physical location –Benefits of VLAN Performance Performance Formation of virtual workgroups Formation of virtual workgroups Easy Administration Easy Administration Cost Cost Security Security

Switching Technology VLAN Deployment VLAN Deployment –Dynamic VLANs Switch ports are joined to a VLAN based on the workstation’s MAC address Switch ports are joined to a VLAN based on the workstation’s MAC address Cisco Works 2000 or VLAN Management Policy Server (VMPS) can be used to associate MAC addresses to VLANS Cisco Works 2000 or VLAN Management Policy Server (VMPS) can be used to associate MAC addresses to VLANS Management is a headache in large networks Management is a headache in large networks –Static VLANs Membership is based on the VLAN that a switch port belongs to Membership is based on the VLAN that a switch port belongs to –Every port is configured to be belong to a VLAN Static VLANs allow for tighter control of resources and user movement Static VLANs allow for tighter control of resources and user movement Easy management Easy management –No need to maintain large MAC address tables

Switching Technology Software Software –CatOS OS loaded on Switches OS loaded on Switches Older OS and Cisco is working to move away from CatOS and to IOS Older OS and Cisco is working to move away from CatOS and to IOS IOS is used on routers IOS is used on routers New equipment shipped comes with IOS New equipment shipped comes with IOS