Unit Numbering Within The Stack - 3Com 3CR17561-91-US - Switch 4500 26PORT Managed 24 10/100 2 Gbe Stackable RJ45 Getting Started Manual

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Unit Numbering

within the Stack

When a port is operating in stack mode it will no longer be

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configurable in the normal way, that is, you cannot control port

features such as auto-negotiation, VLANs, static addresses, STP,

Aggregated Links, Resilient Links, and so on. However, it is possible to

specify the stack VLAN.

Figure 22

Stack example (using 4 units)

Speed:Gr een = 100Mbps, Ye llow = 10Mbps

Duplex:Gr een = Full Duplex, Ye llow = Half Duplex

Speed: (100Base-TX) Gr een = 100Mbps Ye llow = 10Mbps (1000Base-X) Green = 1000Mbps Ye llow = 10/100Mbps

Duplex: Green = Full Duplex, Ye llow = Half Duplex

10/100BASE-TX

Speed: (100Base-TX) Gr een = 100Mbps Ye llow = 10Mbps (1000Base-X) Green = 1000Mbps Ye llow = 10/100Mbps

Duplex: Green = Full Duplex, Ye llow = Half Duplex

10/100BASE-T X

Speed: (100Base-TX) Gr een = 100Mbps Ye llow = 10Mbps (1000Base-X) Green = 1000Mbps Ye llow = 10/100Mbps

Duplex: Green = Full Duplex, Ye llow = Half Duplex

10/100BASE-TX

When a stack is created using the Switch 4500 the unit numbering can

be determined in two ways.

You can manually assign unit IDs 1 to 8 to specific units using the

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change[self-unit, unit-id] to [1-8,

auto-numbering] command from the System View. If you

manually assign unit IDs to a Switch via the change command the IDs

will be retained after a power cycle.

If you add a unit to a stack that has previously been manually

configured with a unit ID and this conflicts with an ID already within

the stack, then the Switch with the lowest MAC address assumes the

ID in question and the other unit will automatically renumber.

3Com recommends that you manually assign the unit IDs within the stack

if you wish to have predictability of knowing which units have which IDs

at all times.

Stack topology is 'discovered' and the units auto-number their IDs.

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Adding and removing units from the stack does not cause any

renumbering to occur and the stack will continue to work normally.