
Using Translation Bridge Services
114060 Rev. A 4-3
Bridge Operations
The Bay Networks translation bridge software provides a link between the
transparent bridging and source routing software on the router. The following
sections describe how that link functions.
SR Operations
To facilitate SR operations, you assign the TB network a ring number. To stations
on the SR network, the entire TB network appears to be one additional network
segment or ring, identified by this ring number. When the SR bridge receives a
frame destined for this ring number, it passes it to the translation bridge.
Routing of Explorer Frames
SR networks use explorer frames to determine the route between stations. (Refer
to Chapter
2 for a description of how SR networks determine routes.)
Some stations generate all-routes explorer (ARE) frames, which are multiple
frames that traverse all the possible routes between source and destination
endstations. Some stations generate a spanning-tree explorer (STE) frame, a
single frame that follows a loop-free path from source to destination.
When an SR network interface receives an STE or ARE explorer frame, the source
route bridge is responsible for forwarding that frame to any other appropriate
source route network interfaces. The translation bridge is responsible for
forwarding that frame to any other appropriate transparent bridge network. When
the translation bridge receives either an STE or ARE explorer frame, it determines
what to do based on the frame’s source and destination addresses, as follows:
• If the frame has a group destination address, the translation bridge completes
these steps:
-- Forwards the frame to the transparent bridge, which sends it out all ports.
-- If the source address is not in the RIF table, adds the address and its
routing information to the table.
-- If the source address is in the RIF table, updates its routing information.
• If the frame has a specific destination address, the translation bridge
completes these steps:
-- If the source address is not in the RIF table, adds the address and its
routing information to the table.
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