ciscocisco-catalystntptimetimezone
I would like to synchronize a Cisco Catalyst 2960 series switch with a publicly available NTP server such as time.apple.com. I have reviewed the knowledge base article here:
Catalyst 2960 Configuration Guide but am not entirely sure which parts of the "Configuring NTP" subsection are relevant to my configuration.
To get a better picture of what happens, you can do a show file systems | i flash|nvram, dir nvram:, and dir flash: on some of the devices in question. The short answer: NVRAM is a kind of flash memory, and it is never removable. The location of vlan.dat varies by switching platform... the IOS configfiles are always in nvram unless the device is forced to manually store them elsewhere.
Router#show file systems | i nvram|flash
65536000 32514632 flash rw sup-bootflash:
129004 127128 nvram rw const_nvram:
1964024 1960900 nvram rw nvram:
65536000 32514632 flash rw bootflash:
15990784 15990784 flash rw dfc#3-bootflash:
Router#dir const_nvram:
Directory of const_nvram:/
1 -rw- 1876 <no date> vlan.dat
129004 bytes total (127128 bytes free)
Router#dir nvram:
Directory of nvram:/
1918 -rw- 0 <no date> startup-config
1919 ---- 0 <no date> private-config
1920 -rw- 0 <no date> underlying-config
1 ---- 4 <no date> rf_cold_starts
2 ---- 47 <no date> persistent-data
3 -rw- 0 <no date> ifIndex-table
1964024 bytes total (1960900 bytes free)
Router#show ver | i IOS
IOS (tm) s72033_rp Software (s72033_rp-IPSERVICES_WAN-M), Version 12.2(18)SXF16, RELEASE SOFTWARE (fc2)
Router#
DAL-EDG-SW01#sh ver | i IOS
Cisco IOS Software, C3560 Software (C3560-IPSERVICESK9-M), Version 12.2(55)SE, RELEASE SOFTWARE (fc2)
DAL-EDG-SW01#show file systems | i nvram|flash
File Systems:
Size(b) Free(b) Type Flags Prefixes
* 32514048 8593920 flash rw flash:
524288 488396 nvram rw nvram:
DAL-EDG-SW01#
DAL-EDG-SW01#dir nvram:
Directory of nvram:/
479 -rw- 29740 <no date> startup-config
480 ---- 3028 <no date> private-config
1 ---- 35 <no date> persistent-data
2 -rw- 0 <no date> ifIndex-table
3 -rw- 598 <no date> IOS-Self-Sig#3434.cer
524288 bytes total (488396 bytes free)
DAL-EDG-SW01#dir flash:
Directory of flash:/
2 -rwx 11190304 Mar 1 1993 12:44:55 -05:00 c3560-ipbasek9-mz.122-53.SE1.bin
3 -rwx 12677496 Oct 6 2010 20:11:22 -04:00 c3560-ipservicesk9-mz.122-55.SE.bin
4 -rwx 13336 Feb 28 1993 19:01:18 -05:00 vlan.dat
6 -rwx 3096 Apr 29 2011 15:21:40 -04:00 multiple-fs
7 -rwx 3028 Apr 29 2011 15:21:40 -04:00 private-config.text
8 -rwx 29740 Apr 29 2011 15:21:40 -04:00 config.text
32514048 bytes total (8593920 bytes free)
DAL-EDG-SW01#
TQ-DC5-CORE1#sh file systems | i nvram|flash
* 15998976 7844352 flash rw flash:
15998976 7844352 unknown rw zflash:
393216 377552 nvram rw nvram:
TQ-DC5-CORE1#dir flash:
Directory of flash:/
2 -rwx 5 Mar 13 2011 08:13:56 -04:00 private-config.text
3 -rwx 8127303 Feb 28 1993 19:18:13 -05:00 c3550-ipservices-mz.122-44.SE6.bin
4 -rwx 320 Feb 28 1993 19:19:52 -05:00 system_env_vars
5 -rwx 255 Feb 28 1993 19:34:51 -05:00 info
6 -rwx 255 Feb 28 1993 19:37:38 -05:00 info.ver
7 -rwx 0 Feb 28 1993 19:19:52 -05:00 env_vars
10 -rwx 6736 Oct 29 2010 16:24:23 -04:00 vlan.dat
9 -rwx 1048 Mar 13 2011 08:13:56 -04:00 multiple-fs
11 -rwx 14583 Mar 13 2011 08:13:56 -04:00 config.text
15998976 bytes total (7844352 bytes free)
TQ-DC5-CORE1#dir nvram:
Directory of nvram:/
378 -rw- 14583 <no date> startup-config
379 ---- 5 <no date> private-config
1 -rw- 0 <no date> ifIndex-table
393216 bytes total (377552 bytes free)
TQ-DC5-CORE1#sh ver | i IOS
Cisco IOS Software, C3550 Software (C3550-IPSERVICES-M), Version 12.2(44)SE6, RELEASE SOFTWARE (fc1)
TQ-DC5-CORE1#
I still say console access, who says you need to be there physically? You can use a console server which will allow you to access and control serial consoles at remote location.
For instance:
Best Answer
Example config:
To check status: