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Full Discussion: Expect script help needed- script failing if router unavailable
Top Forums Shell Programming and Scripting Expect script help needed- script failing if router unavailable Post 302523935 by mrkz1974 on Friday 20th of May 2011 10:04:37 AM
Old 05-20-2011
Expect script help needed- skipping unavailable routers?
Hey all. Sometimes I'm tasked to change some router configs for the entire network (over 3,000 Cisco routers). Most of the time its a global config parameter so its done with a loop and an IP list as its the same configuration change for all routers. This is working OK.

However, sometimes an expect script must be generated for ALL routers since the config changes are different for each router. The way we approach it, we divide the routers per regional domains (6 in total), and produce 1 expect script per regional domain. The problem I'm having is that when I schedule these type of expect scripts to run via crontab, they usually get hung anytime a router fails to respond (maintenance, outage, etc). How can I make the script go to the next router if a router cannot be reached? Here's a sample line of the 20K lines:

....
Code:
#
set timeout 10
spawn telnet 10.156.112.1
match_max 100000
expect Username:
sleep .1
send -s -- "username\r"
expect Password:
sleep .1
send -s --  "passwordstring\r"
expect *
sleep .1
send -s --  "conf t\r"
expect *
sleep .2
send -s -- "no ip flow-export destination 172.17.187.127 9995\r"
expect *
sleep .2
send -s -- "no ip flow-export destination 10.24.180.110 9995\r"
expect *
sleep .2
send -s -- "ip flow-export destination 172.17.187.188 9995\r"
expect *
sleep .2
send -s -- "ip flow-export destination 10.24.180.110 9995\r"
expect *
sleep .2
send -s -- "end\r"
expect *
sleep .4
send -s --  "wr mem\r"
expect *
sleep .2
send -s --  "exit\r"
expect eof
#
#
set timeout 10
spawn telnet 10.156.112.2
match_max 100000
expect Username:
sleep .1
send -s -- "username\r"
expect Password:
sleep .1
send -s --  "passwordstring\r"
expect *
sleep .1
send -s --  "conf t\r"
expect *
sleep .2
send -s -- "no ip flow-export destination 172.17.187.127 9995\r"
expect *
sleep .2
send -s -- "no ip flow-export destination 10.24.180.110 9995\r"
expect *
sleep .2
send -s -- "ip flow-export destination 172.17.187.188 9995\r"
expect *
sleep .2
send -s -- "ip flow-export destination 10.24.180.110 9995\r"
expect *
sleep .2
send -s -- "end\r"
expect *
sleep .4
send -s --  "wr mem\r"
expect *
sleep .2
send -s --  "exit\r"
expect eof
#
#

Thanks!
Marcos
Last edited by mrkz1974; 05-20-2011 at 11:42 AM..
 

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LEARN ABOUT OPENSOLARIS

sleep

sleep(3UCB)					     SunOS/BSD Compatibility Library Functions					       sleep(3UCB)

NAME

       sleep - suspend execution for interval

SYNOPSIS

       /usr/ucb/cc [ flag ... ] file ...

       int sleep(seconds)
       unsigned seconds;

DESCRIPTION

       sleep() suspends the current process from execution for the number of seconds specified by the argument.  The actual suspension time may be
       up to 1 second less than that requested, because scheduled wakeups occur at fixed 1-second intervals, and may be an arbitrary amount longer
       because of other activity in the system.

       sleep()	is implemented by setting an interval timer and pausing until it expires.  The previous state of this timer is saved and restored.
       If the sleep time exceeds the time to the expiration of the previous value of the timer, the process sleeps only until the timer would have
       expired, and the signal which occurs with the expiration of the timer is sent one second later.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Async-Signal-Safe 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       cc(1B), alarm(2), getitimer(2), longjmp(3C), siglongjmp(3C), sleep(3C), usleep(3C), attributes(5)

NOTES

       Use of these interfaces should be restricted to only applications written on BSD platforms.  Use of these interfaces with any of the system
       libraries or in multi-thread applications is unsupported.

       SIGALRM should not be blocked or ignored during a call to sleep(). Only a prior call to alarm(2) should generate SIGALRM  for  the  calling
       process	during	a call to sleep(). A signal-catching function should not interrupt a call to sleep() to call siglongjmp(3C) or longjmp(3C)
       to restore an environment saved prior to the sleep() call.

WARNINGS

       sleep() is slightly incompatible with alarm(2). Programs that do not execute for at least one second of clock time between successive calls
       to  sleep()  indefinitely  delay  the alarm signal. Use sleep(3C). Each sleep(3C) call postpones the alarm signal that would have been sent
       during the requested sleep period to occur one second later.

SunOS 5.11							    30 Oct 2007 						       sleep(3UCB)
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