« 2009年10月27日 | HOME | 2010年01月08日 »
In case that system does not boot up since IOS is broken or missing.
TFTP
This is for Cisco 800 series. Make sure IOS file is ready on TFTP site.
Check whether IOS is in flash or not.
boot# list
boot# set file-name = c800-y6-mw.121-5.yc2.bin (IOS name on TFTP)
boot# set serv-ip = 192.168.10.51 (IP address for TFTP)
boot# set unit-ip = 192.168.10.2 (IP address for Router)
boot# set netmask = 255.255.255.0 (Subnet mask)
boot# set gate-ip = 192.168.10.1 (In case that TFTP is on other network)
boot# save
Save above setup.
boot# upload tftp
Download from TFTP.
boot# save file = c800-y6-mw.121-5.yc2.bin
Save IOS from RAM to flash
boot# boot
This is how to collect data for Router and network when it is unstable.
Router# show tech-support (page)
You can show all results with show command at once. This is good to see a router and netowrk status with one command. page option can show data page by page.
If you would like to see password too.
Router# show tech-support password
Router# show logging
Show log data which Router has output.
Router(config)# logging console (level)
Router can output a real time message. You need to specify below level.
level0 : emergencies
level1 : alerts
level2 : critical
level3 : errors
level4 : warnings
level5 : notifications
level6 : informational
level7 : debugging
Router(config)# logging hostname or IP-address
You can save a log file to syslog server.
Router# show processes cpu
You can see CPU occupancy when Router is slow.