Installation and Reference Guide HP AdvanceStack 100Base-THub-12TX, Hub-12TXM, and Switch Modules 1997-06

HP Hub-12TX/Hub-12TXM Installation and Reference Guide
Installing the System 2-13
Hot Swap
The AdvanceStack Hub-12TX/Hub-12TXM supports a “hot
swap” capability that allows you to connect/disconnect hubs or
media connectors from the system with minimal disruption to
the network. You can remove any network cabling without
affecting traffic passing across the internal repeater bus.
However, if the Stacking Cable is disconnected at any point in
the stack, or is not properly terminated, all Ethernet and
management traffic passing through the cable will be disrupted.
I
When changing modules in the Expansion Slot, first disconnect
power to the concerned hub.
Configuring a Manageable Stack
To manage the stack with the VT-100 console interface, the
stack must include a Hub-12TXM (i.e., a unit with an SNMP
agent).
You should also consider adding a backup SNMP agent to
provide greater management reliability for critical applications.
The procedures required to install these system components are
described below.
Installing an SNMP Backup Agent
The VT-100 console interface
only provides access to the
private MIB.
Just add the Hub-12TXM(s) to the stack and let the system
automatically choose the Master agent and the backup agent
based on longest up-time. The
Master indicator on the device
chosen as the primary agent will turn ON. The
Backup indicator
will turn ON for all other Hub-12TXMs.