2011. Overview of School Network Devices. Typical School Network Devices

5/9/2011 Overview of School Network Devices Typical School Network Devices 1 5/9/2011 Network Operations Center Network Operations Center 2 ...
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5/9/2011

Overview of School Network Devices

Typical School Network Devices

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Network Operations Center

Network Operations Center

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Network Operations Center

Network Operations Center

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Network Operations Center • To check to see if you have a switch down on your campus, type in a web browser; – http://slaweb/index.php/outages/ • If you have a switch down, you’ll see a device under the “Switch” list that starts with your 3-letter ship-to, followed by the room number (communications closet) where that switch is located.

AT&T WAN (Internet) Devices US Robotics v.92 Modem – Used to connect to the router when the internet is down. The 4 red LEDs indicate the modem is working properly. (AA, CD, TR, and CS)

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AT&T WAN (Internet) Devices

AT&T WAN (Internet) Devices Cisco 1841 Router

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AT&T WAN (Internet) Devices Cisco 7301 Router

AT&T WAN (Internet) Devices Cisco 2821 Router

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AT&T WAN (Internet) Devices Cisco 3845 Router

AT&T WAN (Internet) Devices • Fiber Connection Box – Canoga Perkins • Connects directly to AT&T Router via an Ethernet patch cable • Usually mounted flat on the wall behind the main communications rack

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AT&T WAN (Internet) Devices • Another type of fiber connections box – Edge Access

Cisco Switches 3500 and 3550 Series switches “Stackables” These are edge switches with 10/100Mb port for computers, and gigabit uplink ports to connect to the backbone switch and/or other edge switches. Single power cord in the back, no On or Off button. 12-port model with fiber GBIC and Gigastack GBIC

48-port model

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Cisco Switches Gigastacks Gigastack gbics connect stacks of Cisco switches together at gigabit speeds. Each connected switch has a gigastack gbic with one yellow cable connecting the switch above it and another yellow cable below it.

Cisco Switches Fiber and RJ45 “Copper” GBICs Fiber and Copper GBICs provide gigabit uplink capability. Fiber GBICs connect remote closet switches to the backbone switch. RJ45 GBICs provide connectivity to other switches that may have built-in gigabit RJ45 ports, and also gigabit servers in some cases. RJ45

FIBER

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Cisco Switches Core (“Backbone”) Switches Core switches act as the backbone of your network; all remote switches in other communication closets connect to this switch in one way or another. These switches can have 10/100/1000Mb ports depending on the modules installed. Common core switch models are the Cisco Catalyst 6506, 4006, and 4003. If possible, it is preferred that most school routers and servers are plugged into the core switch. These core switches have gigabit capable RJ45 ports. Note that if these switches were to go down or go offline, your entire site will likely lose network connectivity.

Cisco Switches Cisco 6500

Cisco Core Switch Examples Cisco 4006

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HP Switches HP model switches can be modular or have a fixed amount of ports. Depending on the model and module type, port speeds can be 10/100, or 10/100/1000, and can also provide POE for phones and access points. Seen below on the left is a 5400 (used as a core network switch and also as an edge switch), and on the right a 3500yl.

HP Switches Fault indicators All HP switches (with the exception on the 9300 models) have FAULT LEDs in the upper left corner of the device. When operating normally, the green POWER LED will be solid green. A blinking FAULT LED usually indicates a bad fan or bad port – another LED will blink at the same time as the FAULT LED to indicate what the problem is. A solid FAULT LED indicates a more serious hardware or software error on the switch.

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HP Switches HP 9300 Core Switch HP 9300 model core network switch. Shown below is a 4 module model, also in the schools are 8 module models. Power is in the front of these devices, no on/off switch or button. Green LEDs indicate the power supplies are on and receiving power.

HP Switches HP switch in a school’s main communications closet.

Wireless controller

Core network switch with fiber uplinks

AT&T modem

AT&T WAN (Internet) Router

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HP Switches Remote communications closet

Cisco Wireless All Access Points at a school are controlled by a WLAN Controller located at that campus. Power cords for WLAN Controllers are in the back, no on/off button. WLAN Controllers are uplinked to the core network switch. Models include 4400 (shown below), 4000, and 4100 series. Depending on how many access points are at a campus, a site may have more then one WLAN Controller.

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Cisco Wireless Cisco 4101 WLAN Controller

Access Points LED indicators Normal operation Power LED = Green Alarm = OFF 2.4 Ghz = Amber 5.0 Ghz = Red All LED’s blinking at once = Software is downloading, do not unplug.

Cisco 1020

All LEDs are scrolling back and forth indicate no network connection, or the AP cannot find the WLAN Controller. Solid Red Alarm LED indicates a possible faulty access point

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Access Points

Cisco 1142

Cisco 1131

Green LED indicates the AP is operational, with no clients associated. Blue LED indicates the AP is operational, and has clients currently associated.

Access Points

Cisco 1252

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Common Causes for Network Related Problems • Power related – Network devices not plugged into a UPS, or the UPS it is plugged into has a bad battery. Power going on and off rapidly could lead to hardware failure of network devices if left un-protected. • Network Loops – Both ends of a network cable plugged into a network switch. This could be in the communications closet itself or in a classroom. • Rogue Network Devices – Home routers, hubs, and non-district approved access points (Apple Airport, Linksys, D-Link) brought on campus may not be cabled correctly, causing network loops, and could also give out incorrect DHCP addresses. • Client Drivers – Updating the network driver or software on a client, especially for wireless adapters, can resolve many connectivity problems. • Keep critical servers or devices plugged into core network switches (on gigabit ports) where possible. If located in a remote closet, make sure it’s plugged into the switch that has the fiber uplink. • Green cables are generally for uplinks for critical devices, and sometimes yellow and blue are used for router uplinks, these connections should not be moved.

To report a network related problem, please contact the ETS Service Desk at (754) 321-0411.

If you have any further questions or suggestions about this presentation, please contact me! Michael Luzadder JDL Technologies SBBC Network Operations Center [email protected]

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