+------+------+-----+-----+---------+------+------------------------+
| Dest | Dest | Src | Src | Control |      |                        |
| Stn  | Net  | Stn | Net |  Byte   | Port |          Data          |
+------+------+-----+-----+---------+------+------------------------+
  <------ - - Packet Header - - ------>     <-- - Packet Data - -->

BridgeQuery &80 - New bridge available on network:

XY+0	Destination station 		FF (broadcast)
XY+1	Destination network 		FF (broadcast)
XY+2	Source station			18
XY+3	Source network			18
XY+4	Control byte			80 (New bridge available on network broadcast)
XY+5	Port				9C (BridgeQuery frame)
XY+6	Other network ID		<network id B>

When an &80 frame is received, the bridge will clear it's network tables, fill it with the network data from the &80 frame and respond with an &81 frame, adding it's own network to the network table


BridgeQuery &81 - Reply to 'New bridge available on network':
XY+0	Destination station 		FF (broadcast)
XY+1	Destination network 		FF (broadcast)
XY+2	Source station			18
XY+3	Destination station		<bridge's network address where the &81 was received>
XY+4	Control byte			81 (Reply to 'New bridge available on network broadcast')
XY+5	Port				9C (BridgeQuery frame)
XY+6	Other network ID		<network id>
XY+...	Consecutive other network ID's	<network id>

When an &81 frame is received, the bridge will fill the network table with the network data from the &81 frame and respond with an &81 frame, adding it's own network to the network table