I'd like to suggest a change.
RUNRMTCMD
CMD('\supporttools\DNSCMD GDSDNS /recordadd dekko-1 myibmi 600 A
10.10.1.211')
RMTLOCNAME(GDSPC74 *IP) RMTUSER('downtime') RMTPWD('deleted')

Adding the 600 changes the TTL, or Time To Live, to 600 seconds, or 10
minutes. During your switch process you do not want really long standard
default times or clients will keep trying to attach via the old address.
Now, at least a day before your switch you may want to decrease your TTL
in your dns down to 10 minutes also. Perhaps a day after the switch back
you may want to increase your TTL back to standard default times to reduce
load on your DNS.

So the scenario might be:

Thursday: Go into your Windows DNS client. View, Advanced. Find your
existing dns entry. Change TTL down to 10 minutes.

Friday: Switch process runs. Part of it runs
/* Delete primary address */
RUNRMTCMD
CMD('\supporttools\DNSCMD GDSDNS /recorddelete dekko-1 myibmi A
10.17.1.86 /f')
RMTLOCNAME(GDSPC74 *IP) RMTUSER('downtime') RMTPWD('deleted')
/* Add backup address, with low TTL */
RUNRMTCMD
CMD('\supporttools\DNSCMD GDSDNS /recordadd dekko-1 myibmi 600 A
10.10.1.211')
RMTLOCNAME(GDSPC74 *IP) RMTUSER('downtime') RMTPWD('deleted')

Sunday: Switch back. Part of it runs
/* Delete backup address */
RUNRMTCMD
CMD('\supporttools\DNSCMD GDSDNS /recorddelete dekko-1 myibmi A
10.10.1.211 /f')
RMTLOCNAME(GDSPC74 *IP) RMTUSER('downtime') RMTPWD('deleted')
/* Add primary address, with default TTL */
RUNRMTCMD
CMD('\supporttools\DNSCMD GDSDNS /recordadd dekko-1 myibmi A 10.17.1.86')
RMTLOCNAME(GDSPC74 *IP) RMTUSER('downtime') RMTPWD('deleted')

Rob Berendt

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