3Com 3CR17561-91-US Getting Started Guide - Page 65

Unit Numbering within the Stack,

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Unit Numbering within the Stack 65 ■ 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 22 Stack example (using 4 units) Speed:Green = 100Mbps, Yellow = 10Mbps Duplex:Green = Full Duplex, Yellow = Half Duplex Speed: (100Base-TX) Green = 100Mbps Yellow = 10Mbps (1000Base-X) Green = 1000Mbps Yellow = 10/100Mbps Duplex: Green = Full Duplex, Yellow = Half Duplex 10/100BASE-TX Speed: (100Base-TX) Green = 100Mbps Yellow = 10Mbps (1000Base-X) Green = 1000Mbps Yellow = 10/100Mbps Duplex: Green = Full Duplex, Yellow = Half Duplex 10/100BASE-TX Speed: (100Base-TX) Green = 100Mbps Yellow = 10Mbps (1000Base-X) Green = 1000Mbps Yellow = 10/100Mbps Duplex: Green = Full Duplex, Yellow = Half Duplex 10/100BASE-TX 3CR17562-91 SuperStack 3 Switch 4500 50-Port 49 50 49 50 PWR RPS 25 26 25 26 3CR17561-91 SuperStack 3 Switch 4500 26-Port 1000BASE-X 10/100/1000BASE-T 25 26 25 26 3CR17561-91 SuperStack 3 Switch 4500 26-Port 1000BASE-X 10/100/1000BASE-T 25 26 25 26 3CR17561-91 SuperStack 3 Switch 4500 26-Port 1000BASE-X 10/100/1000BASE-T 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.

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Unit Numbering within the Stack
65
■
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 22
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
c
hange[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.
3
C
R17561-91
SuperSt
ac
k 3 Swit
c
h 4500 26-Por
t
1000BASE-X
10/100BASE-TX
10/100/1000BASE-T
Speed: (100B
a
se-TX) Green = 100M
b
ps
Yellow = 10M
b
ps (1000B
a
se-X) Green = 1000M
b
ps
Yellow = 10/100M
b
ps
Duplex: Green = Full
Duplex,
Yellow = H
a
lf Duplex
26
25
25
26
3
C
R17561-91
SuperSt
ac
k 3 Swit
c
h 4500 26-Por
t
1000BASE-X
10/100BASE-TX
10/100/1000BASE-T
Speed: (100B
a
se-TX) Green = 100M
b
ps
Yellow = 10M
b
ps (1000B
a
se-X) Green = 1000M
b
ps
Yellow = 10/100M
b
ps
Duplex: Green = Full
Duplex,
Yellow = H
a
lf Duplex
26
25
25
26
3
C
R17561-91
SuperSt
ac
k 3 Swit
c
h 4500 26-Por
t
1000BASE-X
10/100BASE-TX
10/100/1000BASE-T
Speed: (100B
a
se-TX) Green = 100M
b
ps
Yellow = 10M
b
ps (1000B
a
se-X) Green = 1000M
b
ps
Yellow = 10/100M
b
ps
Duplex: Green = Full
Duplex,
Yellow = H
a
lf Duplex
26
25
25
26
3
C
R17562-91
SuperSt
ac
k 3 Swit
c
h 4500 50-Port
PWR
RPS
Duplex:Green = Full Duplex,
Yellow = H
a
lf Duplex
Speed:Green = 100M
b
ps,
Yellow = 10M
b
ps
49
50
49
50
2
25
2