SWITCH SELECTION GUIDE – HOW TO SELECT NETWORK SWITCHES
November 11th, 2009
Overview
The network switch is a usual member with many network infrastructure and as such preference of a brand brand brand new switch or upgrading is a key partial of many network pattern projects. Wireless designs will have switches interfacing with entrance points. That will in a little cases have an start on the switch such as increasing utilization, reserved switch ports, entrance lists, trunking, energy over Ethernet wattage pull or travelling tree protocol. The preference to buy brand brand brand new switches or ascent will be dynamic after deliberation the network comment and pattern facilities specified. The 5 network switch components embody switch chassis, Supervisor Engine, switching modules, energy reserve and IOS/Cat OS software.
Switch Chassis Features
Dimensions, array of slots, processor container assignments, switching fabric, Supervisor Engines supported, Supervisor Engine diversity, energy supplies, energy supply failover, rack units.
Supervisor Engine Features
Switches have been implemented with a Supervisor Engine (Switch Processor) for estimate packets on a network segment. Routing is accessible with an onboard multilayer switch underline label (MSFC) or track processor using IOS code. The network switch Supervisor Engine using IOS formula on the MSFC and the switch processor is in local mode, whilst those using Cat OS on the processor is in hybrid mode. Some engines won’t await local and hybrid mode. The engine with no MSFC supports what is called Cat OS mode. Select the engine which matches pattern specifications. The MSFC procedure is integrated with the Supervisor Engine or upgradeable. You contingency exercise a PFC procedure with any MSFC. Some Supervisor Engines have no MSFC module. The routing is integrated with the hardware and as such await local mode only.
The Supervisor Engine facilities embody – upheld switch chassis, uplink speed, processor memory, local IOS, Cat OS, PFC, MSFC, container assignment, diversity.
- Supervisor Engine 720: 6500 array switches, 400 mpps, MSFC3, IOS, Cat OS
- Supervisor Engine 32: 6500 array switches, fifteen mpps, MSFC2A, IOS, Cat OS
- Supervisor Engine 5: 4500 array switches, 72 mpps, Integrated Routing, IOS
- Supervisor Engine 4: 4500 array switches, 48 mpps, Integrated Routing, IOS
Switching Module Features
The Switching Module facilities embody – upheld switch chassis, interface speed, array of ports, media, cabling, connectors, throughput, Supervisor Engine supported, custom features, Power over Ethernet, Cisco Prestandard or 802.3af.
- Media: Copper, Fiber
- Cabling: UTP Cat 5, CAT 5e, CAT 6, STP, MMF, SMF
- Connectors: RJ45, RJ21, SC, LC
- Transceivers: GBIC, SFP
Power Supply Features
The Power Supply facilities embody – upheld chassis, wattage ratings, Power over Ethernet, input/output amps, energy connective tissue type, IOS, Cat OS.
IOS/Cat OS Software
Cisco network switches can be deployed with IOS, IOS and Cat OS or disdainful Cat OS software. Design facilities will establish what mode and IOS or Cat OS chronicle is selected. The program using on the Route Processor contingency be IOS whilst the Supervisor Engine switch processor will run IOS (native mode) or Cat OS (hybrid mode). Some Cisco switches such as the 4507R muster the Supervisor Engine IV with no MSFC onboard. The routing processor is integrated with the engine. With which pattern the Supervisor Engine IV doesn’t await Cat OS.
- Native IOS – deployed at the network corner where many routing occurs and needs a little switching
- Hybrid – deployed at the network core where there is both routing and high speed switching
- Cat OS – deployed at the network entrance covering where many switching and no routing occurs
Switch Selection Process
The following describes the 5 components of any network switch preference process.
1. Consider Network Assessment and Design
2. Select Switch with Design Features
3. Select Switch with Scalability
4. Balance Cost with Features
5. Select IOS and/or Cat OS Version
The network comment and pattern specifications should be deliberate prior to selecting any specific network switch. The network comment examines what is implemented and what sourroundings the comparison switch will be deployed. The pattern specifications will establish performance, accessibility and scalability facilities needed. Selecting IOS and/or Cat OS versions start after you have the underline set determined. Companies will mention a bill and which is a key care with any apparatus selection. It isn’t price in effect to name a 6509 switch for an bureau with 50 employees. It is critical which you name switches which encounter the pattern specifications, has the scalability facilities indispensable whilst being price effective.
Some customary switch facilities to consider:
1) Are there sufficient framework slots ?
2) What Supervisor Engines have been upheld ?
3) Does the Supervisor Engine await farrago ?
4) Is Multilayer Switching accessible ?
5) What Switching Modules have been accessible ?
6) What Uplinks have been accessible ?
7) What Power Supply wattage is accessible ?
Number of Rack Units ?
Switch Selection Example:
The Network Assessment detected the following apparatus at the association office.
· Distribution bureau has 300 employees
· Fast Ethernet at the Desktop
· 6509 Switch with Gigabit Ethernet Trunking
· 3800 Router with twin T1 circuits
· Power over Ethernet is implemented
· Multiple VLANS defined
· Local Unix and Windows Servers
· Some bandwidth complete applications
· Voice over IP is implemented
· Wiring closets have been 500 feet apart
· Several rack units have been available
The pattern specifies an one some-more 180 people will be in use soon. The association will have employees operative from a third building where the electric wires broom closet is 500 feet from the 6509 switch. The association will exercise a little Wireless, IP Telephony and conclude VLANS with specified groups.
The following is a list of specific facilities needed:
1. 4 slots with Switching Modules of 48 Port – 10/100BaseT
2. Gigabit Trunking in in between electric wires closets
3. Supervisor Engines with diversity
4. Multilayer Switching
5. Power over Ethernet support
6. Dual Power Supplies with at slightest 2800W for IP Telephony
7. Quality of Service for VoIP
8. Performance switching for converged telephony network
Selected Switch: Cisco 4507R
The 7 container switch such as the Cisco 4507R is a great preference with an one some-more 180 employees. The switch will have 4 – 48 pier Switching Modules with a container accessible for any one some-more employees. The twin Supervisor Engine IV will be reserved 2 slots with failover, Multilayer Switching in in between VLANS and Gigabit uplinks joining the 6509 switch. Each switch procedure is PoE able with the brand brand brand new 802.3af standard. Dual energy reserve yield sufficient wattage for implementing hundreds of IP phones and entrance points. The opening is 75 mpps with handle speed switching. The 4507R is some-more price in effect than the nearest 6509 Cisco switch. Several Supervisor Engine models have been accessible with one some-more opening features.
- 7 container framework with 2 Supervisor Engines and 4 Switching Modules with 48 Port – 10/100BaseT
- Supervisor Engine IV with integrated Multilayer Switching, diversity, twin Gigabit uplinks
- Power over Ethernet (PoE) await with 802.3af standard
- Dual Power Supplies with 2800W or 4200W for Telephony, Wireless, Power over Ethernet
- Quality of use facilities for voice traffic
- Fast opening with 75 mpps handle speed switching for converged networking
The 3750 array Cisco switch wasn’t as costly however there were not sufficient slots, stacking record is costly and switches at 38.7 mpps compared with the 4507R switch at 75 mpps. The association would have to buy 5 apart switches with 48 ports for 180 employees. The 2950 Cisco switch doesn’t have energy supply failover with each switch and scalability. The 6509 switch was most some-more expensive, had 2 one some-more slots, some-more opening than was indispensable and the switching modules were expensive. Implementation is rather formidable with the 6500 Cisco switches.
Shaun Hummel is the writer of Network Planning and Design Guide and has a web site focused on report record pursuit poke solutions, web conferencing and online technical interviews.
http://www.networkjobsolutions.com
Shaun Hummel, CCNP, is a Senior Network Engineer with eleven years knowledge in craving network planning, design, and implementation. He has worked for assorted in isolation and open companies in Canada and the United States mending infrastructure, security, and management. He has created Network Planning and Design Guide, Cisco Wireless Network Design Guide and Network Assessment Guide.
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