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What effect does it have on a BACnet network if the Network Id - UDP setting in bCX40x0's on the same BACnet IP network have been set to different values?

Issue

What effect does it have on a BACnet network if the Network Id - UDP setting in bCX40x0's on the same BACnet IP network have been set to different values?

Environment

Continuum BACnet

bCX4000

bCX4040

Cause

A site had it's routers configured with different Network Id - UDP values and communications between controllers were not reliable.

Resolution

In the scenario below, the routers have different Network Id's for the UDP network. They may still be able to talk with each other, but they will all think they are on different networks which could cause routing issues and much more traffic than is required. 

Controller         UDP NET ID                                         UDP COMM2
1                                  1                                                            2701
2                                  2                                                            2702
3                                  3                                                            2703
4                                  4                                                            2704
5                                  5                                                            2705
6                                  6                                                            2706
7                                  7                                                            2707

If all of these bCX's are on the same IP network then they will need to have the same Network Id - UDP value. By default we (and most other BACnet vendors) use a Network Id of 1. Change all of the bCX's so they are on Network ID - UDP of 1, as below.

Controller           UDP NET ID                                         UDP COMM2
1                                  1                                                            2701
2                                  1                                                            2702
3                                  1                                                            2703
4                                  1                                                            2704
5                                  1                                                            2705
6                                  1                                                            2706
7                                  1                                                            2707

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Revision #:
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Last update:
‎2018-09-06 11:06 AM
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