Lab 4.4.4 Investigating Video Traffic Impact on a Network
Step 1: Cable and configure the network
NOTE: If the PC used in this lab is also connected to your Academy LAN or to the Internet, ensure that you
record the cable connections and TCP/IP settings so that these can be restored at the conclusion of the lab.
a. Connect and configure the devices in accordance with the given topology and configuration.
1) Set clock rate on the serial link to 56000.
2) Routing will have to be configured across the serial WAN link to establish data communications.
NOTE: Your instructor may substitute for Discovery Server an equivalent server for this lab.
b. Ping between Host1 and Discovery Server to confirm network connectivity. Troubleshoot and
establish connectivity if the pings fail.
Step 2: Observe data traffic
In this step, you will generate concurrent data traffic and observe the time the flows take.
a. From Host1 command line, issue the command ping 172.17.1 1 –n 500 to generate a large
number of pings to Discovery Server.
b. While the pings are being generated on Host1, launch a web browser and enter the URL
http://server.discovery.ccna or http://172.17.1.1 to access the web services
configured on the server.
c. Use FTP to download a file. On Host1, launch a new web browser window and enter the URL
ftp://server.discovery.ccna, or issue ftp server.discovery.ccna from the command
line. If DNS is not configured, the IP address 172.17.1.1 must be used instead of the domain name.
d. Download a large file from the server; for example, the Thunderbird setup program file.
Note the total time taken to complete the pings, access the web page, and download the file.
answers vary
Step 3: Stream the video file
Before beginning to stream the video ensure that QuickTime Player is installed on Host1, and that the video streaming service has been enabled on Discovery Server. See your instructor for advice if you are unsure. Launch QuickTime Player. Under File menu, go to Open URL Enter URL rtsp://172.17.1.1/MWO.sdp, or a URL as provided by the instructor.
Note rate at which it plays back and the video and sound quality.
Video Quality Answers vary.
Sound Quality Answers vary.
Step 4: Observe both video and data traffic
a. From Host1 command line, issue the command ping 172.17.1 1 –n 500 to generate a large
number of pings to Discovery Server.
b. While the pings are being generated, use QuickTime Player to access the streaming video URL again.
c. While the video is being played, launch a new web browser window on Host1 and enter the URL http://server.discovery.ccna or http://172.17.1.1 to access the web services
configured on the server.
d. On Host1, launch another web browser window and enter the URL ftp://server.discovery.ccna, or issue ftp server.discovery.ccna from the command
line. If DNS is not configured, the IP address 172.17.1.1 must be used instead of the domain name.
e. Download a large file from the server; for example, the Thunderbird setup program file.
Note the total time taken to complete the pings, access the web page, and download the file.
Answers vary.
Note rate at which it plays back and the video and sound quality.
Video Quality Answers vary.
Sound Quality Answers vary.
Step 5: Observe the data flows with a different serial link clock rate
a. Change the serial link clock rate to 250000 on the router with the DCE interface.
b. Repeat Step 4 and record your observations.
Note the total time taken to complete the pings, access the web page, and download the file.
Answers vary.
Note rate at which it plays back and the video and sound quality.
Video Quality Answers vary.
Sound Quality Answers vary.
c. Change the serial link clock rate to 2000000 on the router with the DCE interface.
d. Repeat Step 4 and record your observations.
Note the total time taken to complete the pings, access the web page, and download the file.
Answers vary.
Note rate at which it plays back and the video and sound quality.
Video Quality Answers vary.
Sound Quality Answers vary.
Instructor Note: The Cisco 1841 router with WIC 2T Serial interfaces can support clock rates up to 4 000 0000 bits per second (4Mbps); other platforms and WIC 2A/S Serial interfaces may have a lower maximum clock rate.
Step 6: Record your general observations
Compare the different download times and video quality.
Step 7: Clean up
Erase the configurations and reload the routers and switches. Disconnect and store the cabling. For PC hosts that are normally connected to other networks (such as the school LAN or to the Internet), reconnect the appropriate cabling and restore the TCP/IP settings.
Step 8: Reflection
Consider and discuss how video and other data traffic can share network resources while maintaining acceptable performance.
Video and data traffic can share the same network resources if adequate bandwidth is available or if traffic is
prioritized. Data traffic can be delayed slightly in order to allow the more time sensitive video traffic to make use
of the available bandwidth.
Final Configurations
Router 1
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname ISP
!
boot-start-marker
boot-end-marker
!
enable password cisco
!
no aaa new-model
ip cef
!
!
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 172.17.0.1 255.255.0.0
duplex auto
speed auto
!
interface Serial0/1/0
ip address 10.10.0.1 255.255.255.252
no fair-queue
clock rate 2000000
!
interface Serial0/1/1
no ip address
shutdown
clock rate 2000000
!
router rip
version 2
network 10.0.0.0
network 172.17.0.0
!
!
!
ip http server
no ip http secure-server
!
!
!
control-plane
!
!
!
line con 0
password cisco
login
line aux 0
line vty 0 4
password cisco
login
!
scheduler allocate 20000 1000
end
Router 2
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname FC-CPE-1
!
boot-start-marker
boot-end-marker
!
enable password cisco
!
no aaa new-model
ip cef
!
!
!
interface FastEthernet0/0
ip address 10.0.0.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/1/0
ip address 10.10.0.2 255.255.255.252
!
interface Serial0/1/1
no ip address
shutdown
clock rate 2000000
!
router rip
version 2
network 10.0.0.0
!
!
!
ip http server
no ip http secure-server
!
!
!
control-plane
!
!
!
line con 0
password cisco
login
line aux 0
line vty 0 4
password cisco
login
!
scheduler allocate 20000 1000
en
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