Monday, 30 May 2011

Automatic Backup of Cisco Router Configuration using KRON


About KRON:
The Command Scheduler (KRON) Policy for System Startup features enables support for Command Scheduler upon system startup.
Command Scheduler allows customers to schedule fully-qualified EXEC mode CLI commands to run once, at specified intervals, at specified calendar dates and times, or upon system startup. Originally designed to work with CNS commands, Command Scheduler has a broader application. Using the CNS image agent feature, remote routers residing outside a firewall or using Network Address Translation (NAT) addresses can use Command Scheduler to launch CLI at intervals to update the image running in the router.
Command Scheduler has two basic processes. A policy list is configured containing lines of fully-qualified EXEC CLI commands to be run at the same time or interval. One or more policy lists are then scheduled to run after a specified interval of time, at a specified calendar date and time, or upon system startup. Each scheduled occurrence can be set to run once only or on a recurring basis. 

Commands
RX2(config)# kron policy-list netx
RX2(config-kron-policy)# cli sh running-config | redirect tftp://172.16.1.150/backup-cfg
RX2(config-kron-policy)#  exit
RX2(config)#  kron occurrence netx-kron at 10:00 recurring
RX2(config-kron-occurrence)#  policy-list netx
RX2(config-kron-occurrence)#  exit

Verification:
RX2#sh kron schedule
Kron Occurrence Schedule
netx-kron inactive, will run again in 0 days 21:03:06 at 10:00 on

The above configuration can be used to schedule automatic backup of Cisco Router Configuration. As per the configuration given, Router is scheduled to take backup at 10:00AM everyday to TFTP Server specified.

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