rif describes the path used to source route packets between the
source route and the destination. The first two bytes contain the routing
control (RC) field that describes the routing type, field length, direction
bit, and largest frame size, as follows:
bits 1-2: RIF type
00: Specifically Routed Frame (SRF)
11: Spanning Tree Explorer (STE)
10: All Routes Explorer (ARE)
bit 3: Reserved
bits 4-8: Length of RIF (maximum = 18 bytes)
bit 9: Direction that frames traverse LAN
0: Forward
1: Reverse
bits 13-16: Reserved
src contains the disposition of frames containing address in
the source address field of the Ethernet header. F indicates they are
forwarded; D indicates they are dropped.
src_addr contains the station (MAC-level, or physical) address of the
source interface.
xs_flood denotes whether frames destined for address are (1) for-
warded, (2) flooded, or (3) dropped.
Management Information Base Variables
lbmib: Bridge Address Table Information Base
18-80