D-Link 1824i User Guide - Page 31
Slave Hub Roles - ip address
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10BASE-T Stackable Hubs another master hub upstream. If it receives commands from a master hub, it becomes a Standby Master, controlled by the Active Master. If it does not receive any commands, or if the Active Master hub fails, it will become the Active Master. Note that even if there are more than two master hubs in the stack, the Standby indicator of the additional master hubs will not light. However, if the Active Master at the head of the stack fails, the first Standby Master will become the Active Master, and the next master hub will then become a Standby Master. A master hub can only manage hubs that are downstream of it. Therefore, you should place the hub that you want to serve as the Active Master at the head of the stack. If you want to use Standby Master hubs, you should place them directly downstream of the Active Master. Otherwise, you will not be able to control or monitor any slave hubs upstream of the master hub. Each master hub has its own IP address. All master hubs respond to SNMP management commands, though only the Active Master is capable of controlling and monitoring other hubs. If the Active Master hub fails, then you will need to use the IP address of the new Active Master to manage the other hubs in the stack. Slave Hub Roles Slave hubs can operate standalone or can be a Managed hub controlled by an (upstream) Active Master hub. If there are no master hubs in the hub stack, or if the Active Master hub in the stack fails and there is no Standby Master hub to take its place, the slave hubs will be Standalone hubs. (In a case where the Master Hub fails, you should power the slave hubs off and then on again to insure they are in a valid state before using them as Standalone hubs.) Standalone hubs all have a Hub ID of 0. As a standalone hub, all ports will be enabled, and settings such as hub segmenting, intrusion security, etc. will have no effect. Building Hub Stacks 4-3