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BACnet Configuration Issues: MSTP MAC Address Check for gaps and MaxMaster settings
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Misconfigured MSTP devices will add delay in token passing and therefore updating data. These can change when controllers are added to the MSTP trunk, so should be constantly monitored.
Current Solution
open list view of all devices on MSTP Trunk (If use folders, then need to use Search)
expose the BACnet Address which is the MSTP MAC Address
expose Max Master setting (default 127)
Manually review for gaps in MAC address and remedy in the field
Take the highest MAC address and round up to nearest 5, then set that as MAX MASTER for EACH device, especially the device with the highest MAC. DO NOT change the AS MSTP Port Max Master from 127 because it should always look to pass the token to any possible device.
PROPOSED SOLUTION:
Check MAC addresses explanation
DEPENDANT ON SYSTEM DISCOVERY PROVIDING MAC ADDRESS (BACNET ADDRESS, which is usually not included in XBK)
THESE MAY NEED TO BE DONE IN ORDER BECAUSE DEPENDANT ON DATA FROM PREVIOUS
RULE: For greatest efficiency in MSTP Token Passing per MSTP trunk, all MAC addresses should be in consecutive order from 1 and each have Max Master set to same value, which is highest MAC address rounded up to nearest multiple of 5.
NOTE: Nearest multiple of 5 rule allows for addition of a couple controllers without having to adjust max master value for all MSTP devices on the trunk.
Check for gaps in MAC addresses per MSTP Port
Find all MAC Addresses
Find highest MAC address and record its max master (called MaxMasterFromHighestMAC).
HIGH WARNING: Find gaps in device MAC addresses from 1 MaxMasterfromHighestMAC. If greater than 5, then report Number of Missing MAC addresses and recommend consecutive ordering of device MAC Addresses from 1.
HIGH WARNING: If MaxMasterFromHighestMAC is 127, then recommend change all MSTP device Max Master to RecommendedMaxMaster (which is Highest Mac rounded up to multiple of 5.
MEDIUM WARNING: If MaxMasterFromHighestMAC is greater than MaxMaster plus 10, then recommend changing all MSTP Device to RecommendedMaxMaster
MEDIUM WARNING: If Max Master of any device NOT EQUAL to MaxMasterFromHighestMAC, recommend changing to recommended max master RecommendedMaxMaster
Report number of free MAC addresses between 1 and HighestMAC, if number free is greater than 0, then report “REDUCE GAP IN MAC ADDRESS”