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Changing the IOS version in flash would cause serious problems, so the router will not allow you to do it. 10 Using SNMP to Perform Mass Configuration Changes Problem You want to automate the distribution of a set of configuration commands to a large number of routers. Solution The Perl script in Example 17-3 will distribute configuration commands to a large number of routers. It works using SNMP to trigger TFTP file transfers into the routers. In effect, this script lets you automatically distribute a series of configuration commands to a list of routers.

All rights reserved. 20 Using RMON to Send Traps Problem You want the router to send a trap when the CPU rises above a threshold, or when other important events occur. Solution You can configure a router to monitor its own CPU utilization and trigger an SNMP trap when the value exceeds a defined threshold with the following set of configuration commands: Router#configure terminal Enter configuration commands, one per line. End with CNTL/Z. 0 60 absolute rising-threshold 70 1 fallingthreshold 40 2 owner ijbrown Router(config)#end Router# The following commands will configure the router to monitor its own buffer failures and send an SNMP trap when the number of failures exceeds a threshold: Router#configure terminal Enter configuration commands, one per line.

End with CNTL/Z. 1 ORATRAP Router(config)#snmp-server trap-source loopback0 Router(config)#end Router# Discussion Normally, when you enable SNMP traps to a remote server, that server will see the source IP address of the router’s closest interface. However, this is not always meaningful. For instance, it is relatively common practice to populate your DNS with only the router’s loopback interfaces. In this case, the server will not be able to resolve the originator of the trap. Further, it can be difficult to correlate traps from the same router delivered through different interfaces.

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