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EtherHub 1500 System User’s Guide
Setup and Configuration 4-3
FlexBus 1500 Management Link
The management link in a chain of cascaded hubs must be
connected to manage the stack as a single unit. This means that
only hubs connected using the FlexBus 1500 can be controlled by
an SNMP management agent. At most, 10 hubs can be managed
and linked together using the FlexBus 1500 connection.
Hub ID Setting
In a stacked system, each hub should have a unique ID number to
identify itself. The EtherHub-16i
+
automatically sets its Hub ID
if attached to an SNMP management agent (EtherHub-16mi
+
)
through the FlexBus 1500 port. However, for this automatic
function to work, the Hub ID Setting before connecting to the
agent should be set to the factory default (i.e., automatic hub
ID generation; where all Hub ID LEDs are blinking). When
the stack includes a EtherHub-16mi
+
, you can also select hub IDs
using the EtherHub 1500 System Configuration Program via out-
of-band or with AccView/Open via in-band communication.
Refer to Hub ID Setting in this chapter for more information.
F
If the Hub ID of EtherHub-16mi
+
is set to factory default (i.e, 0000), it will
automatically set/change this ID number to 1 when used in a stand-alone
configuration.
SNMP Backup Agent
The EtherHub 1500 system supports a management agent
backup function. This special function allows the hub stack
system to have two SNMP network management agent devices,
wherein one agent is configured as a Master agent and the other
as a Slave (Backup) agent. Normally, the agent in slave mode
behaves as an EtherHub-16i
+
, but if the Master agent fails, the
Slave agent takes over its functions. The data stored in the