The 8239 RI/RO Modules are not hot-pluggable. For information on installing and
cabling a RI/RO Module or removing a RI/RO Module, refer to “RI/RO Module” on
page 3-2.
RI/RO cables should be installed and connected at both ends before enabling
(unwrapping) these interfaces. Any of these interfaces that are not going to be used
should be administratively disabled (wrapped).
In a stack consisting of more than one 8239 Model 1, use caution when
implementing a network with more than one RI/RO interface per stack. Multiple
RI/RO connections between two ring segments or between two 8239 Model 1s in
the same stack can cause undesirable results, such as a division of the ring into
two independent segments.
The 8239 RI/RO ports emulate the IEEE 802.5 Dual Ring Recovery process to
ensure there is high availability and reliability between the 8239 and any compatible
devices connected to the 8239. The Dual Ring Recovery protocol ensures that
there is an active, functional ring prior to unwrapping the RI/RO connection. If a
fault occurs off the RI/RO connection, there is a known protocol to detect and
correct the fault, where possible, and resume communications as quickly as
possible.
RI/RO Configuration Options
There are two RI/RO configuration options:
¹
Administrative mode
¹
Up/down traps
RI/RO Administrative Mode
An administrative mode associated with each RI/RO indicates whether or not the
RI/RO connection should be allowed to unwrap onto the ring if conditions are
correct to do so. The default value for the RI/RO administrative mode is disabled.
To enable the RI/RO administrative mode, issue either of the following terminal
interface commands:
¹
ENABLE RING_IO
¹
UNWRAP RING_IO
Both of the above commands are equivalent. Two different commands are provided
for the same function for flexibility.
When RI/RO is administratively enabled, the RI/RO’s green status LED initially is
off and its status is WRAPPED. When RI/RO is administratively disabled, the
RI/RO’s green status LED is blinking and its status is WRAPPED. To display RI/RO
status, use the DISPLAY RING_IO terminal interface command.
RI/RO Up/Down Traps
The 8239 can be configured to send a RI/RO Status Up Down trap whenever the
status of the RI/RO changes. This parameter is displayed by issuing the DISPLAY
TRAP_SETTINGS terminal interface command and looking at the value of "Ring IO
Status Up Down". The default value is ENABLED. To change the value of the Ring
IO Status Up Down trap_setting, issue the ENABLE/DISABLE TRAP_SETTING
RING_IO_STATUS_UP_DOWN terminal interface command.
For more information about traps, refer to “Trap Processing” on page 7-10.
Chapter 6. Concentrator Functions
6-9
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