Router Troubleshooting 2

Q.You want to clear an old configuration out of your router and return it to a factory default configuration.

Ans.You can delete the current startup configuration files and return the router to its factory default settings with the erase nvram: command:

Router1#erase nvram:
Erasing the nvram filesystem will remove all files! Continue? [confirm]
[OK]
Erase of nvram: complete
Router1#reload
System configuration has been modified. Save? [yes/no]: no
Proceed with reload? [confirm]
You can achieve the same result with the erase startup-config command:
Router1#erase startup-config
Erasing the nvram filesystem will remove all files! Continue? [confirm]
[OK]
Erase of nvram: complete
Router1#reload
Proceed with reload? [confirm]

Q.You want to upgrade the IOS image that your router uses.

Ans. The copy tftp command allows you to use TFTP to download a new IOS version into the router's Flash memory:

Router1#copy flash:
Destination filename [c2600-ik9o3s-mz.122-12a.bin]?
Accessing ..
Erase flash: before copying? [confirm]
Erasing the flash filesystem will remove all files! Continue? [confirm]
Erasing
device... eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee ...
erased
Erase of flash: complete
Loading c2600-ik9o3s-mz.122-12a.bin from 172.25.1.1 (via Fastethernet0/0.1): !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!![OK - 11135588 bytes]
Verifying checksum... OK (0xE643)
11135588 bytes copied in 82.236 secs (135410 bytes/sec)
Router1# reload
Proceed with reload? [confirm]

Q.You want to save a backup copy of your IOS image on a TFTP server.

Ans. You can upload a copy of your router's IOS image to a TFTP server with the following set of commands:

Freebsd% touch /tftpboot/c2600-ik9o3s-mz.122-12a.bin
Freebsd% chmod 666 /tftpboot/c2600-ik9o3s-mz.122-12a.bin
Freebsd% telnet Router1
Trying 172.25.1.5...
Connected to Router1.Escape character is '^]'.
User Access Verification
Password:
Router1>enPassword:
Router1#copy flash:c2600-ik9o3s-mz.122-12a.bin tftp
Address or name of remote host [ ]? 172.25.1.1
Destination filename [c2600-ik9o3s-mz.122-12a.bin]? !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!11135588 bytes copied in 52.588 secs (211752 bytes/sec)
Router1#

Q.You want to load an IOS image into your router through a serial connection to the console or AUX ports.

Ans. You can use the following set of commands to copy an IOS image onto a router through the console or the AUX port:

Router1#copy xmodem: slot1:
**** WARNING ****
x/ymodem is a slow transfer protocol limited to the current speedsettings of the auxiliary/console ports. The use of the auxilaryport for this download is strongly recommended.During the course of the download no exec input/output will be available.
---- ******* ----
Proceed? [confirm]
Destination filename [ ]? c3620-ik9s-mz.122-12a.bin
Erase slot1: before copying? [confirm]
Use crc block checksumming? [confirm]
Max Retry Count [10]:
Perform image validation checks? [confirm]
Xmodem download using crc checksumming with image validationContinue? [confirm]
Ready to receive file...........CC
4294967295 bytes copied in 1450.848 secs (1271445669961 bytes/sec)
Router1#

Q.You want to configure and monitor your router using a browser interface.

Ans. Cisco includes an HTTP server in the IOS. You can enable this feature on a router and then use any standard web browser instead of Telnet to access the router:

Router1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router1(config)#access-list 75 permit 172.25.1.1
Router1(config)#access-list 75 deny any
Router1(config)#ip http server
Router1(config)#ip http access-class 75
Router1(config)#end
Router1#

Q.You want to set the router to automatically reload at a specified time.

Ans.You can set the router to reload after waiting a particular length of time with the reload in command:

Router1#reload in 20
Reload scheduled for 11:33:53 EST Sat Feb 1 2003 (in 20 minutes)
Proceed with reload? [confirm]
Router1#
The reload at command lets you specify a particular time and date when you want the router to reload:
Router1#reload at 14:00 Feb 2
Reload scheduled for 14:00:00 EST Sun Feb 2 2003 (in 26 hours and 44 minutes)
Proceed with reload? [confirm]
Router1#