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| devel:device_data_model [2007/07/04 08:17] – fix morten | devel:device_data_model [2007/07/04 13:08] (current) – one more diagram morten |
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| | Commander | netbox & module | | | Commander | netbox & module | |
| | Member | module | | | Member | module | |
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| ==== Virtual stacks and clusters ==== | ==== Virtual stacks and clusters ==== |
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| {{devel:virtual_stack.png |Diagram of a virtual stack}}Some vendors provide a way to virtually stack multiple standalone devices by connecting them by their regular ethernet ports. Typically, one device in such a stack is assigned the role of //commander//, while the other devices take the role of //members//. The commander will have an IP address and provide management facilities for the stack as a whole. **BUT**, the commander will not present the stack as a single physical unit to the management station. Each device in this stack operates independently of one another; the commander will allow the management station to communicate with each stack member by addressing them with a modified SNMP community string - in essence relaying SNMP communication between the members and the management station. | {{devel:virtual_stack.png |Diagram of a virtual stack}}Some vendors provide a way to virtually stack multiple standalone devices by connecting them by their regular ethernet ports. Typically, one device in such a stack is assigned the role of //commander//, while the other devices take the role of //members//. The commander will have an IP address and provide management facilities for the stack as a whole. **BUT**, the commander will not present the stack as a single physical unit to the management station. |
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| Stack members can optionally also take each their IP address, but will mostly function fine without one. | {{ devel:virtual_stack2.png|Another example of how to connect virtually stacked devices}} Each device in this stack operates independently of one another; the commander will allow the management station to communicate with each stack member by addressing them with a modified SNMP community string - in essence relaying SNMP communication between the members and the management station. Stack members can optionally also take each their IP address, but will mostly function fine without one. |
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| HP has many products that stack in this way, they call it HP Switch Stacks. Some Cisco devices also support this type of stacking, but they call it //clustering//. According to Cisco documentation, physical 3750 switch stacks can also participate in switch clusters, making the chaos complete ;-) | HP has many products that stack in this way, they call it HP Switch Stacks. Some Cisco devices also support this type of stacking, but they call it //clustering//. According to Cisco documentation, physical 3750 switch stacks can also participate in switch clusters, making the chaos complete ;-) |
