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rtrchg.exp
#!/usr/local/bin/expect
#
#    rtrcfg.exp -- a script to perform mass configuration changes to  
#                  a list of routers using telnet and Expect       
#
#
# Set Behavior
set tftp "172.25.1.1"
set workingdir /home/cisco/rtr
#
puts stdout "Enter user name:"
gets stdin userid
system stty -echo
puts stdout "Enter login password:"
gets stdin vtypasswd
puts stdout "\nEnter enable password:"
gets stdin enablepwd
system stty echo
system "cp $workingdir/NEWCONFIG /tftpboot/NEWCONFIG"
set RTR [open "$workingdir/RTR_LIST" r]
set LOG [open "$workingdir/RESULT" w]
while {[gets $RTR router] != -1} {
   if {[ string range $router 0 0 ] != "#"} {
     set timeout 10
     spawn telnet; expect "telnet>"; send "open $router\n"
     expect {
              {Username}   { send "$userid\r"
                             expect {
                                       {*Password*} { send "$vtypasswd\r" }
                                    }
                           }
              {Password}   { send "$vtypasswd\r" }
              timeout      { puts $LOG "$router - telnet failed"
                             close; wait; continue
                           }
            }

     expect {
              {Password}   { puts $LOG "$router - vty login failed"
                             close; wait; continue
                           }
              {Username}   { puts $LOG "$router - vty login failed"
                             close; wait; continue
                           }
              {>}          { puts $LOG "$router - vty login ok" }

              timeout      { puts $LOG "$router - vty login failed"
                             close; wait; continue
                           }
            }

      send "enable\r"
      expect "Password"
      send "$enablepwd\r"
      #
      expect {
               {*#}        { puts $LOG "$router - enable login ok" }

               {*>}        { puts $LOG "$router - enable login failed"
                             close; wait; continue
                           }

              timeout      { puts $LOG "$router - enable login failed"
                             close; wait; continue
                           }
             }
     # CMDs
     set timeout 30
     send "copy tftp://$tftp/NEWCONFIG running-config\r"
     expect "running-config"
     send "\r"
     expect  {
               {OK}        { puts $LOG "$router - TFTP successful"}
               timeout     { puts $LOG "$router - TFTP failed"
                             close; wait; continue }
             }
     send "copy running-config startup-config\r\r\r"
     expect  {
               {OK}        { puts $LOG "$router - config saved"}
               timeout     { puts $LOG "$router - config failed"
                             close; wait; continue }
             }
     #CMDs
     send "exit\r"; close; wait
    }
}
close $RTR; close $LOG
system "rm /tftpboot/NEWCONFIG"