Learn how to configure advanced switching in GNS3. There are multiple ways to support layer 2 switching in GNS3.
Free software worth $200: https://goo.gl/613TUF
Switching options in GNS3: https://youtu.be/zYaljXNfBdc
GNS3 built-in switch part 1: https://youtu.be/3RqIURPLuLE
VIRL image downloads: https://virl.mediuscorp.com/my-account/
Cisco IOS Software Download: https://software.cisco.com/download/navigator.html
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GNS3 Support (Go here if you need help): https://gns3.com/community
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https://www.youtube.com/watch?v=-uXJo8bD0Zo
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Caution: Using the tftpdnld ROM monitor command may erase the system image, configuration, and data files. System image, configuration, and data files must be present on USB CF in slot0 for the router to boot and perform normal file operations.
SUMMARY STEPS
1. Enter ROM monitor mode
2. Set the IP_ADDRESS=ip_address configuration variable.
3. Set the IP_SUBNET_MASK=ip_address configuration variable.
4. Set the DEFAULT_GATEWAY=ip_address configuration variable.
5. Set the TFTP_SERVER=ip_address configuration variable.
6. Set the TFTP_FILE=[directory-path/]filename configuration variable.
7. (Optional) Set the GE_PORT=[0 | 1| 2 | 3] port number for download.
8. (Optional) Set the TFTP_MEDIA_TYPE=[0 | 1] copper or fiber.
9. (Optional) Set the TFTP_MACADDR= mac address of unit.
10. (Optional) Set the TFTP_VERBOSE= [0 | 1| 2] print setting variable.
11. (Optional) Set the TFTP_RETRY_COUNT=retry_times configuration variable.
12. (Optional) Set the TFTP_TIMEOUT=timeout of operation in seconds.
13. (Optional) Set the TFTP_ACK_RETRY=ack retry in seconds.
14. (Optional) Set the TFTP_CHECKSUM=[0 | 1] perform checksum test on image.
15. (Optional) Set the TFTP_DESTINATION=[flash0: | flash1: | usbflash0: | usbflash1:] flash destination device for file.
16. (Optional) Set the GE_SPEED_MODE= speed configuration.
17. Use the set command to verify that you have set the variables correctly.
18. Use the tftpdnld [-r] command to download the image.
Transcription:
So we’ve been told in this network that the operating system of the router has been lost. Clicking on the router, I can see that the router has booted into ROM monitor mode.
Help shows us various commands that we can use in rommon mode. One of them is dir and we can look at the flash of the router.
At the moment no files are available in flash.
If I use the command reset, the boot process fails and we’re back in rommon mode.
Help again shows us various commands that are available. One of those is TFTP download which allows us to download an image from a TFTP server.
In this network, we have a TFTP server which has the operating system. The TFTP server has an IP address of 10.1.1.100
So again, ip config shows us the IP address of the TFTP server.
So we should be able to connect to the TFTP server via the switch that assumes that the port
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https://www.youtube.com/watch?v=bpxSeO8TNHE
Packet Tracer file (PT Version 7.1) : https://goo.gl/nAuusV
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Get my ICND1 and ICND2 courses for $10 here: https://goo.gl/XR1xm9 (you will get ICND2 as a free bonus when you buy the ICND1 course).
For lots more content, visit http://www.davidbombal.com - learn about GNS3, CCNA, Packet Tracer, Python, Ansible and much, much more.
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Use a TFTP Server to Backup and Restore a Configuration
This is a step-by-step approach to copy a configuration from a router to a TFTP server, and back to another router. Before you proceed with this method, make sure you have a TFTP server on the network to which you have IP connectivity.
At the Router prompt, issue the enable command, and provide the required password when prompted.
The prompt changes to Router#, which indicates that the router is now in privileged mode.
Copy the running configuration file to the TFTP server:
CE_2#copy running-config tftp:
Address or name of remote host []? 64.104.207.171
Destination filename [ce_2-confg]? backup_cfg_for_my_router
!!
1030 bytes copied in 2.489 secs (395 bytes/sec)
CE_2#
Open the configuration file with a text editor. Search for and remove any line that starts with "AAA".
Note: This step is to remove any security commands that can lock you out of the router.
Copy the configuration file from the TFTP server to a new router in privileged (enable) mode which has a basic configuration.
Router#copy tftp: running-config
Address or name of remote host []? 64.104.207.171
Source filename []? backup_cfg_for_my_router
Destination filename [running-config]?
Accessing tftp://10.66.64.10/backup_cfg_for_my_router...
Loading backup_cfg_for_router from 64.104.207.171 (via FastEthernet0/0): !
[OK - 1030 bytes]
1030 bytes copied in 9.612 secs (107 bytes/sec)
CE_2#
https://www.cisco.com/c/en/us/support/docs/ios-nx-os-software/ios-software-releases-122-mainline/46741-backup-config.html
Transcription:
The first task in part 2 is to create a loopback on the router.
So on the router interface loopback 0 IP address and I’ll create it as follows.
So show run
shows us the loopback interface and IP address on the router
show start at the moment, it doesn’t show us that.
We don’t have a loopback interface configured but if I save the configuration and type
show start again notice we can see that the loopback is now part of the startup configuration.
We’re now told to copy the startup configuration from the TFTP server to the startup configuration of the router.
So copy tftp start
Before I do that remember that shows start or show startup config shows us the loopback in the configuration. But when I copy the configuration from the TFTP server will the configura
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03:35 Cyber Security Future
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