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Components of a Source Route Frame
114060 Rev. A B-3
Type of Frame
The first three bits specify the type of frame and the return frame requested. These
bits take the following format:
0xx specifies a specifically routed frame (SRF)
10x specifies an all routes explorer (ARE) frame
11x specifies a single routes broadcast (SRB) frame
Length
The next five bits are the length of the RIF field in the frame. A source routed
frame is at least two bytes in length and is called the routing control field.
Direction Bit
The direction bit determines whether the RIF is read from right to left or from left
to right. As an ARE traverses the network, bit 3 is set to 0 to signify that the RIF is
read from left to right. A station replying to an ARE caches the RIF field and sets
the direction bit to 1 so that the RIF is read from right to left.
Frame Size Bits
As an ARE or STE traverses the network, each device that it passes through sets
these bits to the largest frame size possible (in bytes). The Bay Networks router
can accommodate a source route frame size up to up to a 4472 bytes over any
media. The initial value of the bit string is 111 (Table B-1).
Table B-1. Frame Size Bits
Bit Pattern Max Number of Bytes
011 1500
010 2052
011 4472
100 8144
101 11,407
110 17,800
111 Initial Value
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