Note: Connect only IP Phone 1 at the beginning of the lab. IP Phone 2 must be disconnected. Tasks 1: Configure interface FastEthernet 0/0 and DHCP server on RouterA (2811 router) Configure the FastEthernet 0/0 interface with 192.168.10.1/24 ip address. Don't forget to enable the interface with the no shutdown command! CS8581 Networks Laboratory Manual - Click here Related: CSE 5 th Sem All Study materials Join with us and get an instant update if we have uploaded new study materials. Cisco Packet Tracer 8.0.1 is a powerful network simulator for CCNA TM and CCNP TM certification exam training allowing students to create networks with an almost unlimited number of devices and to experience troubleshooting without having to buy real Cisco TM routers or switches. CCNA Lab Manual 7 Lab # 2 How to Create A LAN Objective This lab demonstrates how to make a LAN Network. The demonstration includes: 1. To connect 2 PC's with a cross cable. To connect 2 PC's with a switch using a straight cable. Connecting 2 PC's via Cross Cable Diagram Cross Cable Host A Host B IP Address: 10.0.0.1 IP Address: 10.
Lab 3-2: Network Time Protocol
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Equipment Required
This lab uses the following equipment:
- Cisco router (and a second Cisco router if Internet access is not allowed from the first router)
- Switch that supports voice VLANs
Learning Objectives
Upon completion of this lab, you will be able to configure Network Time Protocol (NTP).
Scenario
SOI wants its new data network to use NTP to synchronize time for network devices.
NTP is not only important for synchronizing the time in network device event logs, but also for VoIP to show the correct time on the display of the phones and record the correct timestamp on voicemails, among other uses. The best way to keep everything synchronized is to use an NTP server to coordinate time.
This lab has instructions for two options:
- Option A assumes access to a production network that can reach an NTP server on the Internet.
- Option B configures another Cisco router to provide NTP time to simulate an Internet NTP server.
These instructions refer to the Pod Addressing Table in Appendix A to determine the IP addresses and VLAN numbers used for your pod. Wherever an x is shown, substitute the pod number.
Task 1: NTP Services
Step 1-1: Load Prior Configurations
Use the configuration from Lab 3-1. If necessary, load the configuration for both the switch and router.
Step 1-2: (Optional) Configure Local Time Zone
NTP is calculated using UTC (Greenwich Mean Time), but you might want to see the time displayed on the router and phones using your local time zone.
For example, U.S. Central Daylight Time would use clock timezone cdt -6.
For example, U.S. Central Daylight Time would use clock summer-time cdt recurring.
Step 1-3: Manually Set the Clock
By manually setting the clock close to the correct time, you reduce the amount of time it takes to synchronize with the NTP server. Ideally, you should be within a minute or two of the correct time.
Use the privileged EXEC mode command clock set to manually set time:
For example, if the current day is Thursday, August 16, 2012 and the time is 9:40 p.m., you would enter clock set 21:40:00 16 August 2012.
Step 1-4 (Option A): Contact an NTP Server on the Internet
(Proceed to Step 1-4 [Option B] if you do not have access to the Internet.)
Configure an interface on the router to reach the Internet. The commands in this step assume that Fast Ethernet 0/1 is cabled to a production network with Internet access and a DHCP server that will assign IP addresses to the router.
A list of NTP stratum two servers can be found at www.ntp.org (http://support.ntp.org/bin/view/Servers/StratumTwoTimeServers). Best free app for photo editing for mac. After selecting one close to you, use the ntp server command:
Skip Step 1-4 (Option B) and go to Step 1-5 to verify NTP operation.
Step 1-4 (Option B): Configure Another Cisco Router to Act as an NTP Server
(Skip this step if you completed Option A.)
The commands in this step assume that Fast Ethernet 0/1 on the voice router is cabled to another Cisco router. (A serial interface could also be used, but the Ethernet interfaces do not require any additional hardware.)
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First, configure the other router to connect to the voice router.
Set the time zones and clock on the NTP_Server router to match the VoIP router (as you did in Steps 1-2 and 1-3).
Because you are configuring a 'fake' NTP server, it is best to use a higher NTP stratum number to avoid conflicting with real NTP servers. Configure the NTP_Server router to be an NTP time source with the ntp masterstratum number command.
Configure the VoIP router to connect to the NTP_Server router.
Go to Step 1-5 to verify NTP operation.
Step 1-5: Verify That the Time Is Synchronized
Use the following commands to verify that NTP is working:
In Examples 3-2a to 3-2g, the Pod 11 router is shown acquiring NTP time from another router. Your results will vary, but the descriptions will help you understand the various outputs you might see as the router uses NTP to synchronize.
The show ntp associations command output start with an 'INIT' as the status, while the show ntp associations detail command output shows the server as 'insane, invalid, unsynced' and the filter error is 16 (showing no polling data). Delta bicycle light.
Example 3-2a. Output Showing Pod 11 Router Acquiring NTP Time
After the INIT phase is done (which can take a minute), the router shows the difference between the NTP server time and the time on the router. The router is now establishing the variation in time between the received time and local time. At the point the incrementing 'when' counter equals the 'poll' number, the NTP server will be queried again.
Example 3-2b. Output Showing Pod 11 Router Acquiring NTP Time
In Example 3-2c, the router is 3,489.807 seconds off from the NTP server time. This phase will take several minutes.
Example 3-2c. Output Showing Pod 11 Router Acquiring NTP Time
The next phase is to accept the time from the NTP server and establish the accuracy of the local clock. Notice that the router is just over 2 milliseconds off from the NTP server. The 'filteroffset' and 'filtererror' are now 0 for the first poll.
Example 3-2d. Output Showing Pod 11 Router Acquiring NTP Time
Every 64 seconds, the router polls the NTP server again. You can see the polls show up, as the 'filtererror' is gradually set to 0 for each new poll.
Example 3-2e. Output Showing Pod 11 Router Acquiring NTP Time
After enough polls have been completed, the time on the router is NTP synchronized. Your router now considers the NTP server 'our master, sane, and valid.'
Example 3-2f. Output Showing Pod 11 Router Acquiring NTP Time
The asterisk (*) in front of the NTP server IP address shows that the server is synchronized. The show ntp status command also shows that the server is synchronized.
Example 3-2g. Output Showing Pod 11 Router Acquiring NTP Time
Step 1-6: (Optional) Configure the Switch to Get NTP from the Router
For the sake of making sure that all networking devices are synchronized using NTP, the switch should use the router as an NTP source.
Step 1-7: Save the Configurations
Save the configurations into a text file for both the router and switch. They will be needed for future labs.
