[ntp:questions] NTP over redundant peer links, undetected loops
"terje.mathisen at tmsw.no" at ntp.org
Wed Feb 11 20:35:07 UTC 2009
Stefan Schimanski wrote:
> We are trying to implement a NTP installation over a redundant
> network, connecting the stratum 2 servers to the stratum 3 clients.
> The precise situation is the following (compare with
> 3 networks, 192.168.3.0, 192.168.4.0, 192.168.5.0
> ATOM1, ATOM2 - stratum 1 servers in network 3
> GW1, GW2 - stratum 2 servers in all networks, i.e. 3, 4, 5
> CLIENT1...CLIENTn - stratum 3 clients in network 4 and 5
I did quite a bit of work while setting up a big corporate network, with
dual servers, one of which had a Motorola Oncore UT+, in each of three
geographically distributed locations.
I had similar plans like you, wanting to setup two or three layers of
servers, but then I realized that this was totally superfluous!
We had less than 40K server and client machines worldwide, so even if
every single one of them configured all 6 primary servers, the resulting
load would be negligible, the timing results would be optimal, and so
would the redundancy level.
The icing on the cake is that I don't need to consider where a client
machine is located, I simply tell everyone to use exactly the same
configuration file, with one exception:
The core/root DNS servers (as well as DHCP servers and some other
network gear) use the same six servers, but they use the IP addresses
directly instead of the DNS names.
- <Terje.Mathisen at tmsw.no>
"almost all programming can be viewed as an exercise in caching"
More information about the questions