[ntp:questions] Peering recommendation

ulf.norberg at banverket.se ulf.norberg at banverket.se
Fri Jun 29 09:55:54 UTC 2007


Hi.

I've been searching the net for recommendation about peering and how to
avoid synchronisation loops, but I haven't found anything that answers
my questions.

Almost every time I see a picture about NTP, peering is drawn like my
"case1" below, but I never seen an explenation saying, it must look like
this or you have to do it in a certain way.

Can peering be done as described in my case2 and case3 or should anyone
of them be avoided?

Case1
|-------|       |-------|       |-------|       |-------|
|server1| <---> |server2| <---> |server3| <---> |server4|
|-------|       |-------|       |-------|       |-------|
    


Case2
|-------|       |-------| 
|server1| <---> |server2| 
|-------|       |-------| 
    ^               ^
    |               |
    |               |
    v               v
|-------|       |-------|
|server3| <---> |server4|
|-------|       |-------|


Case3
|-------|       |-------| 
|server1| <---> |server2| 
|-------|<     >|-------| 
    ^     \   /     ^
    |      \ /      |
    |       X       |
    |      / \      |
    v     /   \     v
|-------|<     >|-------|
|server3| <---> |server4|
|-------|       |-------|

Best regards
Uffe



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