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Unit Numbering within the Stack 61
■ When a port is operating in stack mode it will no longer be
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 20 Stack example (using 4 units)
Unit Numbering
within the Stack
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
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.
Adding and removing units from the stack does not cause any
renumbering to occur and the stack will continue to work normally.
3CR17561-91 SuperStack 3 Switch 4500 26-Por t
1000BASE-X
10/100BASE-TX
10/100/1000BASE-T
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
26 25 25 26
3CR17561-91 SuperStack 3 Switch 4500 26-Por t
1000BASE-X
10/100BASE-TX
10/100/1000BASE-T
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
26 25 25 26
3CR17561-91 SuperStack 3 Switch 4500 26-Por t
1000BASE-X
10/100BASE-T X
10/100/1000BASE-T
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
26 25 25 26
3CR17562-91 SuperStack 3 Switch 4500 50-Por t
PWR
RPS
Duplex:Gr een = Full Duplex, Ye llow = Half Duplex Speed:Gr een = 100Mbps, Ye llow = 10Mbps
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50
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