Cisco Packet Tracer 7.x tutorials

Packet Tracer 7.2.2 - Precision Time Protocol

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What is Precision Time Protocol (PTP) ?

Precision Time Protocol (P2P) is a feature of Packet Tracer 7.2.2 available in IE2000 industrial switches.

This time synchronization protocol is defined in IEEE-1588 as Precision Clock Synchronization for Networked Measurements and Control Systems, and was developed to synchronize the clocks in networks devices that include distributed device clocks with various levels of precision and stability. Acurate time synchronization is vital for smart grid power automation applications such as virtual power generators and peak-hour billing, but also for network outage monitoring tools which require a high level of time accuracy and stability.

 

PTP configuration in Packet Tracer 7.2.2

Precision Time protocol can be simulated in Packet Tracer 7.2.2 using IE2000 switches. These switches features three PTP modes :

  • boundary
  • end-to-end transparent
  • forward.
Switch(config)#ptp mode ?
  boundary        Boundary Clock mode
  e2etransparent  End-to-End Transparent Clock mode
  forward         Forward packets without processing

 

1.Configure PTP using the following commands

Switch(config)#ptp mode boundary 
Switch(config)#interface fastEthernet 1/1
Switch(config-if)#ptp enable 

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Packet Tracer 7.2.2 - Video tutorials

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Introduction

Cisco Packet Tracer 7.2.2 is a powerful simulation software for CCNA and CCNP certification exam training. The video tutorials provided in this sections will help you to understand the basics of Packet Tracer 7.2.2 operations (tutorial 1) and how the simulation mode works to get a deep analysis of packet flow between network devices (tutorial 2).

Video tutorial 3 provides an advanced network configuration example using Packet Tracer 7.2.2 in a VOIP lab scenario.

 

Tutorial 1 - Basic network configuratio

This first video demonstrates basic use of Packet Tracer 7.2.1. It will show you how to configure IP services on a Cisco ISR router and a workstation in the CiscoTM Packet Tracer 7.2.1 network simulation software :

  • IP address configuration
  • Connection to a router using a crossover cable
  • Initial configuration of the router and the workstation

 

You can configure the workstation's global and interface settings on the Config tab.

The Desktop tab provides additional tools to configure workstation dial-up settings, IP settings, use a terminal window, open a host command line interface, open a web browser, configure LinksysTM wireless settings, establish a VPN connection, generate network frames, and issue SNMP requests to network devices.

 

 

Tutorial 2 -Following packets

This second video tutorial shows how Packet Tracer can capture and display the content of packet as they go through the network (simulation mode). Features are similar to an advanced network tracking software and allows monitoring of frames as they go through and are processed by network devices. The network monitoring tools are available in Packet Tracer simulation mode.

 

 

Tutorial 3 - Configure Cisco Call Manager Express (CME)

This advanced Packet Tracer 7.2.1 video tutorial explains the different options available in Cisco Packet Tracer for Call Manager Express (CME) configuration on a Cisco 2811 ISR router.

 

Legal

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Packet Tracer 7.2.1 - IP telephony devices

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Supported devices in Packet Tracer 7.2.1

Cisco Packet Tracer 7.2.1 supports three telephony devices :

  • Cisco 7960 IP Phone
  • Home VOIP device for analog phone connection to an IP network.
  • Cisco IP Communicator software on desktop or laptop PC

 

Cisco 7960 IP Phone

Cisco 7960 emulated IP phone in Packet Tracer - Front view

 

Power up the phone

Two options are available in Packet Tracer for powering up the 7960 IP Phone :

  • External power adapter
  • PoE (only with 3560 multilayer switch)

If you choose to use the external power adapter, go to the physical tab and drag and drop the "IP_PHONE_POWER_ADAPTER" to the bottom left connector of the 7960 IP Phone.

Cisco 7960 emulated IP phone in Packet Tracer - Back view

 

If you want to use the PoE functionnality of the Cisco 3560 switch, apply the following configuration to the switch interface connected to the phone :

Switch(config)#int fastEthernet 0/1
Switch(config-if)#power inline auto

  

Place calls with 7960 IP Phone

The 7960 IP Phone emulated in Packet Tracer 7.2.1does not have any configurable options. It receives it's IP address through DHCP and it's line number from the Call Manager Express server.

 In the GUI tab, you can place a call, answer a call, and send Do, Re, and Mi notes to the recipient phone. To place a call enter the recipient's line number first using the keypad and then click on the handset to dial out.

To answer a phone call on the analog phone, click on the handset when the phone is ringing. While the line is connected, you can send Do, Re, or Mi to the recipient by pressing the respective buttons. In order to hear the sounds, be sure Sound is enabled in Preferences. To end a call, click on the handset.

 

Home VOIP device

Packet Tracer 7.2.1 - Home VOIP device

The Home VoIP only has a "Server Address" configuration in which you have to place the Call Manager Express IP address.

 

Cisco IP Communicator software

The IP Communicator software is installed on desktop or laptop end devices. Configure the computer for DHCP address assignment and use the "Desktop" tab to access the IP Communicator software. The software will receive it's phone line number from the Cisco Call Manager Express server.

Packet Tracer 7.2.1 - Applications available on a laptop device.

To place a phone call, enter the number of the recipient phone using the keypad and then click the Dial button. Once the recipient has answered the call, the status message will indicate that the Cisco IP Communicator is connected and a green light will show. While the call is still active, click on the Do, Re, or Mi buttons to send the respective sounds to the recipient. To end the call, click the EndCall button. For the best possible experience while making calls, be sure that Sound is enabled in Preferences.

If you want configure the Cisco IP Communicator to use a different TFTP server from the default TFTP server, follow these steps. On the upper right-hand corner of the Cisco IP Communicator GUI, there are four buttons above the words "Cisco IP Phone." Click on the first button from the left to open a context menu and then select Preferences. Select the option Use these TFTP Servers: and then enter the IP address of the TFTP server that you wish to use.

Packet Tracer 7.2.1 - IP Communicator software

Packet Tracer 7.2.1 - Frame Relay configuration

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Introduction

Frame Relay is a protocol standard for WAN internetworking which provides a fast and efficient method of transmitting packets through the network. Frame Relay offers an attractive alternative to both dedicated lines and X.25 networks for WAN links. The success of the Frame Relay protocol is based on the following two factors:

  • Virtual circuits consume bandwidth only when they transport data. Consequently, many virtual circuits can exist across a given transmission line, which is an improvement compared to dedicated leased lines. In addition, each device can use more than the allowed bandwidth as necessary, and thus operate at higher speeds.
  • The increased error-handling sophistication at end stations and the improved reliability of communication lines allows the Frame Relay protocol to discard bad frames and thus eliminate time-consuming error-handling processing.

Cisco Packet Tracer 7.2.1 includes a "Cloud-PT" device for WAN emulation. This device can be configured as a Frame Relay switch.  Router are connected to the Frame Relay switch using serial connections. Virtual circuits, LMI types, and DLCI are configured using the Serial and Frame Relay tabs of the "Cloud-PT" device.

 

 

Network topology used in this tutorial

A hub and sopke sample network topology is created in Cisco Packet Tracer 7.2.2 :

  • R0 router is the spoke router
  • R1 and R2 routers are frame-relay spokes
  • All frame relay routers are interconnected through a Cisco Packet Tracer Cloud device which emulates frame relay circuits.

Packet Tracer 7.1.1 frame relay sample network

 

Frame Relay configuration - WAN cloud

Configure the LMI type and DLCI of virtual circuits on each serial interface of the cloud used for Frame Relay operation.

Create the virtual circuits one the "Frame Relay" tab. DLCI's need to be configured on the "Serial" tabs before creating virtual circuits.

Frame Relay configuration - ISR router configuration

Frame relay hub router configuration (R0)

The hub router is configured with two sub-interfaces to create a virtual circuit with each spoke. Each frame relay sub-interface is mapped with the DLCI number of the corresponding circuit configured in the Packet Tracer WAN emulation Cloud. The DLCI number defines a single virtual connection through the WAN and are the Frame Relay equivalent to a hardware address. 

The encapsulation frame-relay command is mandatory on the main serial interface before configuring frame-relay sub interfaces.

The clock rate defines the speed on the serial interface

interface Serial0/0/0
 no ip address
 encapsulation frame-relay
!
interface Serial0/0/0.101 point-to-point
 ip address 192.168.101.1 255.255.255.252
 frame-relay interface-dlci 101
 clock rate 2000000
!
interface Serial0/0/0.102 point-to-point
 ip address 192.168.102.1 255.255.255.252
 frame-relay interface-dlci 102
 clock rate 2000000

Frame relay spoke routers configuration (R1 and R2)

The spoke routers have only one virtual circuit configured to reach the hub router. The DLCI configured on both spoke routers is the same as the DLCI is locally significant between the WAN Cloud and each customer.

Router R1 configuration

interface Serial0/0/0
 ip address 192.168.101.2 255.255.255.252
 encapsulation frame-relay
 frame-relay interface-dlci 100
!

Router R2 configuration

interface Serial0/0/0
 ip address 192.168.102.2 255.255.255.252
 encapsulation frame-relay
 frame-relay interface-dlci 100
!

Video

Packet Tracer 7.2 - ACL configuration

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Introduction

Access Control Lists (ACL) are used to filter network traffic on Cisco routers. In order to filter network traffic, ACLs control if routed packets have to be forwarded or blocked at the ingress or egress router interface. The router checks each packet to determine whether to forward or drop the packet based on the criteria specified in the ACL applied to the interface.

 

IP ACL types

Two types of IP ACL can be configured in Cisco Packet Tracer 7.2 :

  • Standard ACLs : This is the oldest ACL type which can be configured on Cisco routers. Traffic is filtered based on the source IP address of IP packets. The access-list number can be any number from 1 to 99. This kind of ACL has to be placed near the destination to avoid blocking legitimate trafic from the source.

access-list 1 permit 10.2.25.0 0.0.0.255
access-list 1 deny any

  • Extended ACLs : Introduced in IOS version 8.3, the extended ACLs are more complex and allow filtering of the IP traffic based on a combination of multiple criterias : source IP address, destination IP address, TCP or UDP port, protocol, .... In numbered ACLs, the access-list number can be any number from 100 to 199 or 2000 to 2699 (available in IOS versions >12.0.1). Such ACLs can also be named access lists in which the ACL number is replaced by a keyword. This kind of ACL has to be placed near the source as it allows fine grained control to ressources accessed. Placing the ACL near the destination will make the trafic travel through the network before beeing blocked, resulting in bandwidth waste.

access-list 1 permit ip 10.2.25.0 0.0.0.255 10.1.0.0 0.0.255.255
access-list 101 permit icmp any 10.1.0.0 0.0.255.255 echo
access-list 1 deny ip any any

 

Configuration on Cisco 2911 ISR Router

Restrict remote telnet or SSH access to the ISR router

Access lists can be used to restrict remote SSH or Telnet access to the ISR router management interface (VTY) from specific networks only. Only numbered access-lists are supported on the Virtual Terminal Line.

The access-class command is used to apply the access list on the Virtual Terminal Line. The following configuration deny administrative access to the router except for the 192.168.1.0/24 network hosting admin workstations. Note the wildcard mask used in the access-list configuration for the /24 network.

access-list 1 permit 192.168.1.0 0.0.0.255

line vty 0 4
 access-class 1 in
 login
line vty 5 15
 access-class 1 in
 login