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Configuring Bridging Services
2-12 114060 Rev. A
How the Source Routing Bridge Handles Explorer Frames
This section provides instructions on how the Bay Networks source routing bridge
handles explorer frames (AREs or STEs) sent from ES1 to ES2 (refer to refer to
Figure 2-7). Each bridge’s internal LAN ID, group LAN ID, and bridge ID is in
hexadecimal format below the bridge.
Example A describes the actions of the first Bay Networks bridge.
Examples B and C describe the actions of other Bay Networks bridges in the
explorer frame’s path.
Example A: First bridge to receive the explorer frame
The frame received by Bridge A from Ring 1 did not traverse any other bridges.
This bridge adds the following information in the RIF before it transmits the
frame toward Ring 2 (refer to Figure
2-8):
Incoming ring ID/bridge ID
Internal LAN ID/bridge ID
Outgoing ring ID/bridge ID 0
Examples B and C: Other bridges that receive the explorer frame
The explorer frame received by Bridges B and C contains internal LAN IDs and
bridge numbers, indicating that this frame traversed at least one other Bay
Networks bridge. These bridges perform the following steps in the RIF before
transmitting the frame toward Rings 3 and 4 (refer to Figure
2-8):
1. Remove the last internal LAN ID
2. Replace the incoming ring ID and bridge ID 0 with its own bridge ID
3. Add its own internal LAN ID/bridge ID
4. Add the outgoing ring ID/bridge ID 0
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