Just would like to know if configured multiple NTP server, will it send the NTP queries to all the configured NTP server address or just the prefer one ?? and how to tweak the NTP queries timers to be longer from routers (client) ?? seems to be no way ???
Keep in mind that to accurately maintain time in the face of failing time servers, at least three servers must be continuously queried.
Given that caveat, there are a number of tricks you can play to reduce NTP traffic. My favorite for large hub and spoke networks is to configure all the spokes to use a single server IP, minimizing traffic. The trick is that the IP is not a real server but rather an IP address which is defined (as a loopback interface) on every hub router. The hub routers then use multiple real time servers to keep on time. This approach avoids forwarding spoke time requests across the hub network even when dialed in or otherwise connected to a backup hub router. Of course, this approach assumes that any failures which would cause a hub router to lose time would also cause it to lose the ability to provide any other services to the spokes trying to use it.
WARNING: any time you have multiple routers with duplicate IP addresses, you need to ensure that you understand all the ramifications. In particular, make sure there is a loopback on the router with a globally unique higher IP address before defining the duplicated IP. Picking up the duplicated IP address as the router ID in a routing protocol can have undesireable side effects.
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