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) Routing will have to be configured across the serial WAN link to establish data communications.
2) Configure Telnet access on each router.
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.
1) Confirm Application Layer connectivity by telnetting from R2 to R1.
2) Troubleshoot and establish connectivity if the pings or Telnet fail.
c. After confirming the initial configurations, maintain a console terminal session connection with R2.
Step 2: Examine priority queue commands
a. Enter the following command and note the options available.
FC-CPE-1(config)#priority-list 1 ?
default Set priority queue for unspecified datagrams
interface Set priorities for packets from a named interface
protocol priority queueing by protocol
queue-limit Set queue limits for priority queues
b. Note some of the protocol options available.
FC-CPE-1(config)#priority-list 1 protocol ?
arp IP ARP
bridge Bridging
cdp Cisco Discovery Protocol
compressedtcp Compressed TCP (VJ)
http HTTP
ip IP
llc2 llc2
pad PAD links
pppoe PPP over Ethernet
snapshot Snapshot routing support
c. Note the IP protocol options available.
FC-CPE-1(config)#priority-list 1 protocol ip ?
high
medium
normal
low
d. Note the HTTP protocol options available.
FC-CPE-1(config)#priority-list 1 protocol http ?
high
medium
normal
low
e. Note the IP protocol high priority options available.
FC-CPE-1(config)#priority-list 1 protocol ip high ?
fragments Prioritize fragmented IP packets
gt Prioritize packets greater than a specified size
list To specify an access list
lt Prioritize packets less than a specified size
tcp Prioritize TCP packets 'to' or 'from' the specified port
udp Prioritize UDP packets 'to' or 'from' the specified port
f. Note the IP protocol high priority TCP options available.
FC-CPE-1(config)#priority-list 1 protocol ip high tcp ?
<0-65535> Port number
domain Domain Name Service (53)
echo Echo (7)
ftp File Transfer Protocol (21)
ftp-data FTP data connections (20)
irc Internet Relay Chat (194)
nntp Network News Transport Protocol (119)
pop3 Post Office Protocol v3 (110)
smtp Simple Mail Transport Protocol (25)
telnet Telnet (23)
www World Wide Web (HTTP, 80)
Over 30 port/service options are available.
Step 3: Configure an example priority queue
From the global configuration mode, issue the following commands.
FC-CPE-1(config)#priority-list 1 protocol http high
FC-CPE-1(config)#priority-list 1 protocol ip normal tcp ftp
FC-CPE-1(config)#priority-list 1 protocol ip medium tcp telnet
What do these commands establish?
A priority list (numbered "1") that sets HTTP packets to be marked as high priority, FTP packets as low priority, and Telnet packets as medium priority.
Step 4: Assign the priority list to an interface
a. From the global configuration mode, issue the following commands to assign the priority list to interface serial 0/1/0.
FC-CPE-1(config)#int s0/1/0
FC-CPE-1(config-if)#priority-group 1
b. Confirm the priority list configuration. From the privileged EXEC mode, issue the show runningconfig command.
Which statements in the configuration show that the priority list has been configured and applied correctly?
interface Serial0/1/0
ip address 10.10.0.2 255.255.255.252
priority-group 1
priority-list 1 protocol http high
priority-list 1 protocol ip normal tcp ftp
priority-list 1 protocol ip medium tcp telnet
c. Confirm that issuing the show queueing priority command from the privileged EXEC mode
produces the following output:
FC-CPE-1#show queueing priority
Current DLCI priority queue configuration:
Current priority queue configuration:
List Queue Args
1 high protocol http
1 normal protocol ip tcp port ftp
1 medium protocol ip tcp port telnet
Step 5: Examine the priority queues operation
a. On Host1, launch a web browser and enter the URL http://172.17.1.1 to access the web
services configured on the server.
b. Use FTP to download a file. On Host1, launch a new web browser window and enter the URL
ftp://172.17.1.1, or from the command line issue ftp 172.17.1.1
c. Download a large file from the server; for example, the Thunderbird setup program file.
d. From the privileged EXEC mode, issue the following command:
FC-CPE-1#show queueing interface s0/1/0
Output similar to this should be displayed:
Interface Serial0/1/0 queueing strategy: priority
Output queue utilization (queue/count)
high/94 medium/0 normal/106759 low/0
Note the packet count for each queue:
High __________ Medium __________ Normal __________ Low __________
e. Initiate a Telnet session from R2 to R1 and issue some show commands on R1.
f. Close the Telnet session.
g. Issue the following command from the R2 privileged EXEC mode:
FC-CPE-1#show queueing interface s0/1/0
Note the packet count for each queue:
High __________ Medium __________ Normal __________ Low __________
What is the significant difference when compared to the previous output form this command in
Step 5d?
The Medium queue now has a packet count; this is the priority assigned to Telnet packets.
Step 6: Determine the priority queue requirements for the case study
a. Using the FilmCompany case study, what would you expect the priority queue requirements to be?
b. Discuss and compare your priorities with other students.
c. Amend your priority list statements to include traffic associated with the proposed network upgrade.
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.
Challenge
The following privileged EXEC command displays the contents of packets inside a queue for a particular interface: show queue interface-type interface-number However, in this lab, it is not likely that sufficient data traffic was generated at one time for the interface queues to hold packets long enough to be inspected. Discuss how a network has to be load tested to ensure that all traffic priorities are met.
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 64000
!
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
priority-group 1
!
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
!
priority-list 1 protocol http high
priority-list 1 protocol ip normal tcp ftp
priority-list 1 protocol ip medium tcp telnet
!
!
!
control-plane
!
!
!
line con 0
password cisco
login
line aux 0
line vty 0 4
password cisco
login
!
scheduler allocate 20000 1000
end
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