Setting the FDDI Station
Type
Supported Station Types
GS2000 line cards can serve as any one of the
following FDDI station types:
PHY Port Identification
The FDDI interface is composed of two PHY ports labeled A/M and
B/S. The PHY A/M port functions as either an A port or an M port, depending on the
line card's station type. Similarly, the PHY B/S port functions as either a B port or an S
port. The following table shows the relationship between station type and PHY ports:
If. . . |
Then. . . |
The line card is cabled as a
DAS |
The PHY A/M can be used either
as an A port connected to the FDDI ring, or to the M port of a DAC if in a dual homing
topology. PHY B/S can be used either as a B port connected to the FDDI ring, or to the
M port of a DAC if in a dual homing topology. |
The line card is cabled as a
SAC |
PHY A/M is used as an M port
connected to the S port of a SAS.
PHY B/S is an S port connected to the M port of a Dual Attachment Concentrator (DAC). |
The line card is cabled as a SAS |
PHY B/S is an S port connected
to the M port of either a SAC or DAC. PHY A/M is not used. |
|
Setting or Changing the Station Type
The FDDI interface must be configured to reflect the station type for which the
physical cables are connected. For example, if the GS2000 line card is cabled to function
as a Single Attachment Concentrator, you must set the station type for the interface to
SAC. The default installation setting is DAS.
Procedure:
Step |
Action |
1 |
Select Telnet to Module from the
application tree and connect to the GS2000 line card. |
2 |
At the Main prompt (Main>),
type Config and press Return. |
3 |
At the Config>
prompt, enter interface, followed by a space and the number of the logical
interface you want to configure. Example: Config>interface
10 |
4 |
Press Return. The FDDI/n
config> prompt is displayed. |
5 |
At the FDDI/n
Config> prompt, enter set station station-type where station-type
is das for a Dual Attachment Station, or sac for either
a Single Attachment Concentrator or a Single Attachment Station. The default is das. |
6 |
Press Return. The interface is set as
specified, and the FDDI/n config> prompt is
displayed. |
7 |
Log out of the Telnet session and terminate
the connection. |
|