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Reputation: 21

BACnet IP routing with BACnet Broadcast Management Devices (BBMD)

I have the following setup with 2 BBMDs and a SIEMENS IP Router (Model S615):

Topology

The SIEMENS router is only configured with these firewall rules (except for IP and Port configuration), which should be all I need according to SIEMENS:

Router configuration

Both of the BBMDS are (currently) configured as such:

BBMD Configuration

Except the other one uses UDP port 47809. Both use the router as default gateway on each subnet.

Problem is that the broadcasts are only distributed one way…. I get “I AM” broadcasts in my BACnet browser from the BACnet device, but I do NOT get “WHO IS” broadcasts to my BACnet device from the browser. In other words, the 192.168.1.31 >> 10.83.87.31 is working but 10.83.87.31 >> 192.168.1.31 is not…

BBMD Device used: http://www.hvacrcontrol.com/bacnet-router/

Upvotes: 0

Views: 1573

Answers (1)

Edward
Edward

Reputation: 354

Check your BDTs (Broadcast Distribution Table). A BDT entry needs to specify "one hop" or "two hop", per entry, via the "broadcast distribution mask". For two hop, which I assume is your intended scenario, this mask needs to be 255.255.255.255

I don't know this equipment, you may want to confirm this with the manufacturer.

Upvotes: 1

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