[ntp:questions] monitoring symmetric peers
Kostas Magkos
kmag at islab.demokritos.gr
Tue Jul 13 09:22:32 UTC 2010
Dear David,
First of all, thank you for your reply!
> Your symmetric peers have the same upstream system peer, so by rule
> they are not going to believe each other unless one of them switches
> to a different upstream source.
Well, because I anticipated this one, I've configured the servers to use
a different set of stratum 1 peers.
> Even if they have differerent upstream sources, one of them will not
> beleive the other, since that would create a loop.
So, what you mean is that they could never be sys.peers, right?
But what about symmetrical peering? I cannot verify this association.
For example, when I query the servers for their peers with ntpq (ntpq
-p) they give out a 'u' (in the 't' column) for each other. Shouldn't
there be a 's' code, as in symmetric peer?
Below, some sample output, where 172.16.1.11 and 172.16.1.12 are my servers.
$ ntpq -pn ntp2
remote refid st t when poll reach delay offset
jitter
==============================================================================
-172.16.1.11 193.79.237.14 2 u 510 1024 377 0.001 0.086
28.478
+193.0.0.228 .GPS. 1 u 207 1024 377 55.048 -24.032
28.488
-193.10.7.246 .PPS. 1 u 722 1024 377 75.233 10.813
17.102
*131.130.251.107 .PPS. 1 u 727 1024 377 33.881 -16.762
18.901
-193.204.114.233 .CTD. 1 u 915 1024 377 50.021 1.255
2.851
-213.10.47.241 .GPS. 1 u 203 1024 377 81.600 7.437
27.455
+129.6.15.28 .ACTS. 1 u 726 1024 377 144.306 -18.561
19.022
$ ntpq -pn ntp1
remote refid st t when poll reach delay offset
jitter
==============================================================================
-172.16.1.12 213.10.47.241 2 u 795 1024 376 0.001 -16.716
0.134
-194.177.210.214 .GPS. 1 u 1 1024 377 1.403 -30.231
437.853
*62.119.40.98 .PPS. 1 u 985 1024 377 97.694 3.408
11.246
-193.171.23.163 .PPS. 1 u 891 1024 377 33.508 7.661
8.615
-193.204.114.232 .CTD. 1 u 398 1024 377 49.940 15.822
25.070
-193.79.237.14 .PPS. 1 u 274 1024 377 56.543 -32.257
28.882
+204.152.184.72 .GPS. 1 u 911 1024 377 207.045 -3.783
3.356
+129.6.15.29 .ACTS. 1 u 365 1024 377 149.932 -5.298
25.786
Let me rephrase my question: Were the two servers symmetric peers, what
would I see in the association and peer listing?
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