
Configuring Bridging Services
2-18 114060 Rev. A
To demonstrate IP encapsulation, this section traces a specifically routed frame as
it is sent out from Endstation 1 and arrives at Endstation 2:
• Example A describes the actions of the first Bay Networks bridge to handle
the SRF. This bridge encapsulates the frame with an IP header before it sends
the frame out onto the IP network.
• Example B describes the actions of a Bay Networks bridge that is in between
the first and last Bay Networks bridges to handle the SRF. This bridge
removes the IP header from the frame before it source routes the frame to the
next bridge.
• Example C describes the actions of the last bridge of several Bay Networks
bridges to handle the SRF.
Example A: First of several bridges to receive the SRF
Bay Networks Bridge A is the first to receive the frame from Ring 1. Bridge A
performs the following steps in the RIF before it transmits the frame onto the IP
network (refer to Figure
2-12):
1. Removes its own internal LAN ID.
2. Inserts the group LAN ID before the last incoming ring and bridge ID
listed in the RIF (r
efer to Figure 2-12).
Eventually, the internal LAN ID of the last Bay Networks bridge along the
frame’s path replaces the group LAN ID.
3. Adds an IP header containing the destination address 1.1.2.2 onto the
frame and sends it toward the IP network.
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