Miernik, Jerzy (Jerzy) wrote:
I have a question about how to use ntp in a long linear network. Assume there
are 50 nodes with the one most in the West having GPS, and every node running
ntpd:
node1 --- node2 --- node3 --- ... --- node50
GPS
Which approach to synchronization would be better in terms of the time accuracy
in nodes:
1. configure 'server node1 ...' in nodes 2, 3, ..., 50; or
2. use manycast for automatic client / server self-organization?
Approach 1 seems to me to lead to inferior accuracy due to increasing distance
between a client in nodex and server in node1, where routing in nodes node2,
node3, ..., node(x-1) would add to jitter. Yet we would have one node stratum1
and all others stratum2, it would seem...
I would think approach 2 with manycast would end up in smaller offsets (if any)
between clocks, but would lead to clocks of stratum 16, 17, ..., 50, and I am
not sure how ntpd would react in node16, node17, ..., node50.
Could an expert please offer a comment on which approach would be preferable?
You would want to configure every single node2..node50 to talk directly
to node1, using regular "server node1 iburst" config lines.
Terje
--
- <Terje.Mathisen at tmsw.no>
"almost all programming can be viewed as an exercise in caching"
_______________________________________________
questions mailing list
[email protected]
http://lists.ntp.org/listinfo/questions
