IBM 8239 Token-Ring Stackable Hub, Руководство по установке и эксплуатации

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Yellow LED on means that there is a fault. The fault is associated with the
connection that has green LED off.
For more information on what the Stack In/Stack Out status LEDs mean, refer
to“Stack In/Stack Out Status” on page 5-7.
Beacon Recovery
To help improve network performance and network availability, the 8239 performs
automatic beacon recovery when hard-error faults occur. The 8239 provides
hardware-assisted beacon recovery technology to immediately detect when
hard-error faults are present on the ring. The source of the fault is isolated by the
8239 to minimize the impact on the rest of the network. Once a hard error has
been detected on the ring (that is, a station sends a beacon frame), single faults
usually can be isolated in less than 1 second. Multiple faults take longer to isolate.
Faults can be found by the 8239 beacon recovery algorithm in the following areas:
¹
Data In/Data Out connection
¹
Port connection
¹
Management Interface (8239 Model 1only)
¹
Ring In/Ring Out connection (8239 Model 1 only)
¹
Within the 8239
The following sections describe these fault areas and the actions that are taken
when the fault is removed.
Data In/Data Out Connection
When the beacon fault is found to originate from the Data In or the Data Out
connection on the 8239, the 8239:
¹
Wraps the faulty DI/DO from the stack ring.
¹
Sends a DI/DO status trap to indicate the current state of the DI and DO. The
faulty connection has a status of WRAPPED. Refer to “Trap Processing” on
page 7-10 for details about sending the trap.
¹
Sets the status of the DI/DO to WRAPPED. You can display the DI/DO status
by issuing the DISPLAY WRAP_POINTS terminal interface command. The
DI/DO status will also be displayed on the LCD of any Model 1s in the stack.
Refer to “Operational Codes” on page 5-15 for more information.
¹
Sets the faulty DI/DO’s yellow status LED to on and sets the faulty DI/DO’s
green status LED off.
When the DI/DO on an 8239 is wrapped from the stack data ring, everything on
that 8239 is isolated from the stack data ring, including ports, the Management
Interface (Model 1 only), and any RI/RO connections (Model 1 only).
Once the DI/DO has been wrapped, the 8239 keeps automatically testing the
DI/DO connection and then unwraps the DI/DO connection when it determines that
the stack data ring has a normal operational status.
6-12
8239 Setup and User’s Guide