When I was power failure . My device 6513 will be stop the clock.

[chaoping chen]

When I was power failure . My device 6513 will be stop the clock.

Please tell me why?

Following Information for device:

================================================================

------------------ show module ------------------
Mod Ports Card Type                                 Model                           Serial No.
--- ----- -------------------------------------- ------------------ -----------
  7    2  Supervisor Engine 720 (Active)         WS-SUP720-BASE      SAD111111MZ
  8    2  Supervisor Engine 720 (Hot)            WS-SUP720-BASE       SAD111111K2
  9    6  Firewall Module                              WS-SVC-FWM-1          SAD111111U6
 10   24  CEF720 24 port 1000mb SFP              WS-X6724-SFP       SAL111111JM
 11   24  CEF720 24 port 1000mb SFP              WS-X6724-SFP       SAL1111117P
 12   24  CEF720 24 port 1000mb SFP              WS-X6724-SFP       SAL1111111E
 13   48  CEF720 48 port 10/100/1000mb Ethernet  WS-X6748-GE-TX     SAL111111LC
Mod MAC addresses                       Hw    Fw           Sw           Status
--- ---------------------------------- ------ ------------ ------------ -------
  7  0011.21b5.4d20 to 0011.21b5.4d23   3.1   8.1(3)       12.2(17a)SX4 Ok
  8  0011.21a1.4230 to 0011.21a1.4233   3.1   8.1(3)       12.2(17a)SX4 Ok
  9  0016.9daa.88b4 to 0016.9daa.88bb   4.0   7.2(1)       3.1(6)       Ok
 10  0012.01fc.b404 to 0012.01fc.b41b   2.1   12.2(14r)S5  12.2(17a)SX4 Ok
 11  0012.01fc.b62c to 0012.01fc.b643   2.1   12.2(14r)S5  12.2(17a)SX4 Ok
 12  0011.9298.7670 to 0011.9298.7687   2.1   12.2(14r)S5  12.2(17a)SX4 Ok
 13  0012.4377.2870 to 0012.4377.289f   2.1   12.2(14r)S5  12.2(17a)SX4 Ok

[Leo Laohoo]

Huh?  What am I looking for? 

[chaoping chen]

I just need to know when power failure let to my device stop the clock?

[Leo Laohoo]

Hard to tell.  Is this the only unit that had the power failure?  Any unit connected to this machine that did not had a power failure?

[chaoping chen]

THX for you reply.

   In my network , I used  one unit 6513 for NTP SERVER. But One Day my data center was power failure 2 hour . when the power recover. I found my network clock Delayed for 2 hours. so please let me know. When I was power failure . My device 6513 will be stop the clock？

[Leo Laohoo · Accepted solution]

You use your 6500 as a master NTP server????  Why?

Cisco appliance doesn't have a authoritative clock.  All they have is a simple clock (like the ones powering a PC).  Either you let your 6500 go out to the internet to get an authoritative clock of you consider getting a dedicated GPS receiver that functions as an authoritative NTP source.

[chaoping chen]

Thanks You For Your Idea.

[chaoping chen]

But I has One question， Why the 6500 can't keep clock time running (like PC) when the power failure?

[Leo Laohoo]

You can "save" the calendar/time of a 6500, however, it's not "accurate".  The clock can be, for example, 10 minutes ahead.  Compare the clock now on the 6500 and the correct clock and you'll see discrepancies.

[chaoping chen]

Thank for your keep answering my question , I do know the 6500's clock is undependable now. But my customer wanted to find the exactly reason about the worry time after the power recover. As we know ,it should be two result as the scenario, one is the time go back to 1993 as default , and another is continue not matter it's some minutes ahead or behind.

The problem I meet is the time only delay the same as the power failure time lasted, e.g. the power failed for 2 hours,and when the 6500 recover, the clock displayed 2 hours delayed.

So it's so confused

[Leo Laohoo]

Check the config of your 6500 for the command "ntp update-calendar".

If this present, the command periodically update the calendar (time and date) from your source NTP.  Example, presume that the last calendar update was at 14:00, 13 October 2011.  Luck would have it that you had a power outage at 14:01, 13 October 2011 and recovered the next day at 06:00 14 October 2011.  Guess what time the clock of the 6500 would be.  It would be 14:00 13 October 2011.