I am trying to configure NTP in my network with authentication. I dont have any device in my network with H/W clock. I am planning to set clock manually on cisco 2621 (Acts as master with stratum 4) and enable authentication as well. I configured as below on master (Cisco 2621;host name R1)
r1(config)#ntp master 4
r1(config)#ntp authentication-key 1 md5 cisco
r1(config)#ntp trusted key 1
on client switches
r2(cofnig)#ntp authentication-key 1 md5 cisco
r2(config)#ntp server r1 key 1
is this all needed to get what I wanted? or anything is missing? I couldnt succeed with the above.
As an alternative I am planning to consider NTP Access by restricting with an ACL. What keyword should I use to synchronize is it serve-only or serve???
Do I have to enable authentication even at client by the command "ntp authenticate"? I dont want peer association.
I tried by giving ip address instead of hostname but in vain.
If I configure ACL what keyword should I use for NTP access. Is it serve-only or serve?
I also wanted to know is there any problem in giving loopback ip as NTP server ip address (Currently I am using loopback as NTP serveru ip add). I knew HSRP virtual IP does not work as NTP server ip.................Is this same with Loopback ip aswell?????
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