
Using Source Routing Bridge Services
114060 Rev. A 2-15
Example A: First of several bridges to receive the SRF
The frame received by Bridge C from Ring 4 did not traverse any other Bay
Networks bridges (but there are multiple bridge IDs in the RIF, so it will
eventually). This bridge performs the following steps in the RIF before it
transmits the frame toward Ring 3 (refer to Figure
2-10):
1. Changes the destination system’s MAC address at the beginning of the
frame to a Bay Networks group address.
This address is C000A2FFFFFFx, where x is the bridge ID of the next Bay
Networks bridge specified by the RIF.
2. Removes its own internal LAN ID and inserts the group LAN ID before
the last incoming ring and bridge ID listed in the RIF (r
efer to
Figure 2-10).
Eventually, the internal LAN ID of the last Bay Networks bridge along the
frame’s path replaces the group LAN ID.
3. Copies the destination system’s MAC address into the data portion of the
frame.
Example B: Between the first and last bridges to receive the SRF
The frame received by Bridge B from Ring 3 traversed at least one other Bay
Networks bridge. However, this is not the last Bay Networks bridge that the frame
must traverse. This bridge performs the following steps in the RIF before
transmitting the frame toward Ring 2 (Figure
2-10):
1. Locates the bridge ID, which is at the end of the group address.
2. Changes the bridge ID at the end of the group address to the bridge ID of
the next Bay Networks bridge in the RIF. (Only if it differs from the value
already in place. In this example, all bridge IDs are the same, so the
frame is not modified.)
Example C: Last of several bridges to receive the SRF
The frame received by Bridge A is the last of several Bay Networks bridges
traversed by the frame. This bridge performs the following steps in the RIF before
it transmits the frame toward Ring 1 (refer to Figure
2-10):
1. Replaces the Bay Networks group address with the destination MAC
address that was saved to the data field
2. Replaces the group LAN ID with its own internal LAN ID
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