
Configuring Bridging Services
2-4 114060 Rev. A
Specific Routing
When an endstation receives an ARE or STE frame, it generates a single frame,
called a specifically routed frame (SRF). The SRF traverses a specific path back to
the source endstation; it contains a list of routing designators that maps a path
through the extended network from source to destination.
When an endstation receives an SRF, each bridge between the source and
destination examines the list of routing designators. The bridge forwards the SRF
only if the bridge itself is on the specified path. Otherwise, it ignores the frame.
When the SRF reaches the original source endstation, that station removes the
routing information and stores it in its internal routing table.
Once the endstations discover a route and store the information in their routing
tables, the endstations send specifically routed frames across the source routed
network (Figure
2-3).
Figure 2-3. Route Discovery
Source Routing over IP Networks
The Bay Networks source routing bridge supports Internet Protocol (IP)
encapsulation. IP encapsulation allows the source routing bridge to route frames
to endstations located across an IP backbone network.
These frames use standard IP transmission services and a proprietary sequence
maintenance protocol that ensures error-free, in-sequence delivery of IP
encapsulated frames. The IP network can consist of any standard IP equipment
and media.
ES 1
ES 1
ES 1
ES 2
ES 2
ES 2
All-Paths Explorer or Spanning Tree Explorer
Specifically Routed Frame
Specifically Routed Frame
BRG0023A
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