Upstream And Downstream Neighbors - 3Com 3C780 - LinkBuilder FDDI Base Unit User Manual

Configuring the Hub
3-13
The concept of neighbor is shown in Figure 3-6.
Upstream Downstream
neighbor neighbor
from B from B
A B C
Direction of data flow: A to B to C
Figure 3-6. Upstream and Downstream Neighbors
To display the addresses of the hub's upstream and downstream neighbors, enter
the show neigh command.
A single attachment to the ring occurs when you use the S/M attachment port
configuration. Because the S port restricts the hub to single attachment, the S
port is never attached directly to the primary trunk ring and cannot participate in
wrap configuration.
The M/M attachment port configuration restricts the hub to a null attachment
type.
Tables 3-3 and 3-4 define and summarize the port connection rules supported by
the FDDI specification.