Use the following command to assign each port on the module to one of the
backplane segments on the ShuntBus or isolated segments on the module:
SET PORT {slot.port} NETWORK {network}
5. Assign RI/RO ports to network segments.
If you have configured ports 17 and 18 as RI/RO trunks, you can assign them
to a network using the following command:
SET TRUNK {slot} RING_IN NETWORK {network} orSET TRUNK {slot} RING_OUT NETWORK {network}In this command you do not need to specify port number for the trunk as port
17 is always RING_OUT and port 18 is RING_IN.
Note: If you assign a RING_IN (or RING_OUT) trunk to a segment, the other
trunk will automatically be assigned to the same segment.
6. Setcompatibility mode for the trunk ports.
Ports 17 and 18, when configured as trunks, can be used to connect your
8260 to another hub. Depending on the hub to which the trunk is attached
you must set the following compatibility mode for the trunk:
•8260
This is used when the trunk is connected to another 8260.
•ONcore
This is used when the trunk is connected to a Chipcom ONcore switching
hub.
•8250
This is used when the trunk is connected to an 8250 or 8228.
•ONline
This is used when the trunk is connected to a Chipcom ONline switching
hub.
•8230
This is used when the trunk is connected to an 8230.
All of the current 8260 trunk compatibility modes can be summarized as two
different modes:
a. 8250/8230/ONline
In this mode, the trunks open when enabled as long as a signal can be
passed through the trunk connection. A jitter attenuator is also required
for the trunks to unwrap. There is no phantom involved, and there is no
special protocol involved. Wrapping of the port in the case of a fault is
triggered only by the presence of beacon frames. If the module detects
a beaconing ring and decides the problem is being caused by someone
or something attached to it, it will first wrap the trunks and see if the ring
recovers. If it does, the module goes to a ″schedule″ for retesting the
trunks to see when it recovers. If the module does not recover, it goes
on to removing other ports on that ring until the ring recovers.
b. 8260/ONcore
In this mode, phantom is generated on the RI trunk and/or required to be
detected on the RO port for the RI trunk and/or required to be detected
on the RO port for the trunks to insert. Also a jitter attenuator is not
Chapter 9. 8260 Token-Ring Modules 179