Hi all. I have 2 questions about synching and peering over multiple interfaces and subnets.
For redundancy reasons our supplier of a SCADA system wants to get NTP-time over multiple interfaces. The routers act as stratum-3 servers. (they could possibly be raised to stratum-2 if necessary) Question 1 The SCADA servers is serving 4 different subnets with services and getting it's NTP time from the default gateway on each subnet. These 4 subnets are served by 2 physical routers handling 2 subnets each, so what the SCADA system believes are 4 routers are actually 2. Is there any problem asking the same NTP source twice from different subnets? Any risk of synchronisation loops or other strange behaviour? Question 2 My second question is similar but is about peering. I want to "clean up" the existing NTP-configuration and introduce peering between the SCADA server because they are mutual dependent on each other and there's a need to keep their clocks as close to each other as possible. If I want to peer the SCADA servers with each other, is it any problem peering them over 2 subnets? Each SCADA server will then have 2 peering instances per neighbour in the conf files. Will this cause any strange behaviour in the NTP-synchronisation? If anyone needs a picture to follow my description above, I can send it as PDF to anyone willing to help me solve this issues. Thanks in advance. Best regards Uffe Norberg _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
