THREADED CASE STUDY OF WASHINGTON SCHOOL DISTRICT

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THREADED CASE STUDYOF WASHINGTON SCHOOL DISTRICT
Bryan Shami
Jack
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WAN Pros and Cons

• Pros-
• Management of schools is made simple
• Cost is nominal
• All the schools are connected

• Cons-
• If one of the core routers goes down it will take
  some time to get it up, must have backup
  equipment on hand.
• Everything is very dependent on core routers

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Washington Elementary School District Map
The Washington School District is eight miles
North and South and seven miles East and West
Covering a total of 56 square miles.
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The Benefits of Using PPP

• Error correction with checksum
• LCPs establish, configure, and test the
  data-link connection
• NCPs establish and configure different
  network-layer
• protocols such as IP, IPX, and AppleTalk
• PAP or CHAP can be used for authentication
• Provides for dynamic assignment of IP addresses

The PPP implementation on serial 0 interface is
achieved by using the following router commands

Router config terminal Router (config)
interface s0 Router (config-if) encapsulation
ppp Router (config-if) ppp authentication
chap Router (config-if) ppp chap hostname
hostname Router (config-if) ppp chap password
secret
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Washington District Addressing
One T1 Link will connect each school to the
Core ISDN will connect each school to core Four
T1 Links will connect Core to Core One
Frame-Relay link will connect the Core to the
Internet
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WAN Logical Topology IP Addressing

• The class B IP address of 190.20.0.0 is reserved
  for our core WAN topology. Each of the 3 routers
  has 4 serial ports connections to each other by 4
  TI. For each connection, a pair of IP addresses
  are needed for the connected ports. So in all, 3
  x 4 pairs 24 IP addresses are needed for the 3
  routers.190.20.0.0 is subnetted by borrowing 14
  bit, so each subnet consists of 4 IP (2 bit host
  portion), in which only 2 IP usable. So we have
  the IP ranges from subnet 190.20.0.4, 190.20.0.8,
  and so on with the subnet 255.255.255.252
• Router Data Center to Router Service CenterData
  Center S0 190.20.0.5 to Service Center S0 -
  190.20.0.6Data Center S1 190.20.0.9 to Service
  Center S1 - 190.20.0.10Data Center S2
  190.20.0.13 to Service Center S2 -
  190.20.0.14Data Center S3 190.20.0.17 to
  Service Center S3 - 190.20.0.18
• Router Data Center to Router Shaw ButteData
  Center S4 190.20.0.21 to Shaw Butte S0 -
  190.20.0.22Data Center S5 190.20.0.25 to Shaw
  Butte S1 - 190.20.0.26Data Center S6
  190.20.0.29 to Shaw Butte S2 - 190.20.0.30Data
  Center S7 190.20.0.33 to Shaw Butte S3 -
  190.20.0.34
• Router Shaw Butte to Router Service CenterShaw
  Butte S4 190.20.0.37 to Service Center S4 -
  190.20.0.38Shaw Butte S5 190.20.0.41 to Service
  Center S5 - 190.20.0.42Shaw Butte S6
  190.20.0.45 to Service Center S6 -
  190.20.0.46Shaw Butte S7 190.20.0.49 to Service
  Center S7 - 190.20.0.50

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Data Center MDF

• CSU/DSU
• Back up
• Application Server
• Uninterrupted Power Supply
• Dial up connection for backup
• Computer for monitoring
• Patch Panel
• Router
• Firewall

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Service Center and Shaw Butte MDF

• Back up
• Application Server
• Uninterrupted Power Supply
• Dial up connection for backup
• Computer for monitoring
• Patch Panel
• Router

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Frame Relay
The WAN will have one T1 speed (Frame relay) line
that will connect all sites to the internet. This
connection will occur at the Data Center, from
the firewall routers to the Frame relay cloud.
The DLCI number assigned by Service provider is
100.
Benefits of Frame Relay 1. High-speed, reliable
links 2. Cost-effective alternative to
point-to-point 3. Each site can be connected to
every other by a virtual circuit 4. The router
needs only one physical interface to the carrier
To implement Frame Relay on the Data Center
router interface s0 the following router commands
will be used Router configure terminal Router
(config) interface s0 Router (config-if) ip
address 190.20.0.5 255.255.255.252 Router
(config-if) clockrate 56000 Router (config-if)
no shut Router (config) interface s0 Router
(config-if) encapsulation frame-relay Router
(config-if) frame-relay intf-type dce Router
(config-if) frame-relay map ip 190.20.0.5 100
broadcast Router (config-if) frame-relay map ip
190.20.0.6 100 broadcast
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Routing protocol
The routing protocol used is IGRP, with its
implementation Router config
terminal Router(config) router igrp
100 Router(config-router) network 190.20.0.0
Router(config-router) Ctrl-Z
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Security

• We recommend the use of CHAP security for the PPP
  encapsulation. CHAP stands for (Challenge
  Handshake Authentication Protocol) which prevents
  unauthorized access. We are recommending CHAP
  because of the encryption feature. CHAP is used
  to periodically verify the identity of any remote
  nodes. CHAP makes robust security designs
  easier. CHAP is a popular authentication protocol
  for call screening. Chap is also simple to
  configure on your routers.
• We will also be using the Pix Firewall. The Cisco
  PIX 525 Firewall enables secure private
  communications over the Internet or any IP
  network. It integrates key features of VPNs to
  provide a secure, scalable platform to better and
  more cost-effectively accommodate remote-access,
  remote-office, and extranet connectivity using
  public data services.

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Router Configuration
Routergt enableRouter config tRouter(config)
hostname data_center    enable secret    
line con0    login    password    
exit data_center(config) line aux 0    line
vty 0 4    login    password     exit
data_center(config) interface serial
0data_center(config-if) ip address 190.20.0.1
255.255.255.252    encapsulation frame-relay   
clockrate 56000    frame-relay inverse-arp IP
100 no shutdown    exit
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Router Configuration Cont
data_center(config) interface serial
4data_center(config-if) ip address 190.20.0.2
255.255.255.252    encapsulation frame-relay   
clockrate 56000    no shutdown   
exitdata_center(config) interface serial
8data_center(config-if) ip address 190.20.0.3
255.255.255.252    encapsulation frame-relay   
clockrate 56000    no shutdown    exit
data_center(config) router igrp 121   
network 190.20.0.1    network 190.20.0.2   
network 190.20.0.3    ip classless    end
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