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Using Source Routing Bridge Services
114060 Rev. A 2-11
Source Routing across a Token Ring Network
The Bay Networks source routing bridge handles incoming packets differently,
depending on the source routing bridge’s position in the Token Ring network. To
demonstrate, the following sections describe the routing information field (RIF) of
a frame as it moves back and forth between Endstation 1 (ES1) and Endstation 2
(ES2) (Figure
2-7).
Figure 2-7. Tracking an Explorer Frame
First, we track the RIF of an explorer frame sent from ES1 to ES2. Then, we track
the RIF of a specifically routed frame sent back from ES2 to ES1.
The size of the RIF is variable. It contains the routing information required to
transmit the frame across the network.
Although the following examples show only the Bay Networks source routing
bridge, other IBM-compatible source routing bridges can reside in the same
network.
43
2
1
Internal
Internal
Bridge ID = A
Group ID = FFF
LAN ID = 100
Internal
Internal
Bridge ID = A
Group ID = FFF
LAN ID = 101
Internal
Internal
Bridge ID = A
Group ID = FFF
LAN ID = 102
ES 2
ES 1
Bridge A Bridge B Bridge C
Example A Example B
Example C
BRG0016A
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