HP 100BaseT Guide de l'utilisateur télécharger pdf (Page 50)

HP 100Base-T Hubs Installation and Reference Guide

Setting Up Network Connections 3-3

Using Management Agents

The Hub-12TXM includes an SNMP management agent. To add

SNMP functionality to an entire stack, a Hub-12TXM must be

included in the stack. You may include multiple agents in a

stack to provide a fail-safe backup management agent.

SNMP Backup Agent

The HP 100Base-T Hubs system supports a backup function for

the management agent. This special function allows the stack to

have two or more SNMP network management agents, wherein

one agent is configured as the Master agent and others as

Backup agents.

The agent in backup mode behaves as a Hub-12TX/Hub-24TX.

But if the Master agent fails, the Backup agent takes over its

functions using the latest data mirrored from the Master,

including its IP address. Note that to manage the stack out-of-

band after the Backup has assumed control, you must plug your

PC or modem into the serial port of the Backup agent. If you are

using HP AdvanceStack Assistant, just ensure that your network

management station can access the new control agent via its

current network connection.

Note: Placing redundant agents in a stack will cause the system to

set the agent at the top of the Stacking Cable chain as the Master, and

the others as Backups. If more than one backup exists in a stack, the

backup agent higher up the Stacking Cable chain will be chosen to

function as the Master if it fails. Moreover, if a new agent is added to the

top of the Stacking Cable chain, the system will set this as the Master

and mirror the latest data from the agent with the longest up-time.

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HP 100BaseT Guide de l'utilisateur Page 50