3com 4500 Guide D’Installation Rapide
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Appendix F: C
REATING
A
S
TACK
The 3Com Switch 4500 supports stacking by daisy-chaining from unit to unit over
standard Gigabit Ethernet connections. Resilient stacking, with a return loop from
bottom to top of a stack, is not supported and will disable stack operation.
standard Gigabit Ethernet connections. Resilient stacking, with a return loop from
bottom to top of a stack, is not supported and will disable stack operation.
■
The maximum number of Switch units that can be interconnected is eight.
■
You can only create a stack by interconnecting a 3Com Switch 4500 with other
3Com Switch 4500s.
3Com Switch 4500s.
■
Stacking is only supported using Gigabit ports.
■
The stacking connections must be from one combo port pair on a unit to the
opposite combo port pair on the next unit. Refer to Figure 18 to see how this
looks in a stack of units.
opposite combo port pair on the next unit. Refer to Figure 18 to see how this
looks in a stack of units.
■
The stacking ports must be configured for “fabric mode” before they can be
used for stacking. By default, fabric mode is enabled for ports 25/26 and
49/50. The configuration can be changed to move fabric mode to the other
port pair; this requires a reboot of the system.
used for stacking. By default, fabric mode is enabled for ports 25/26 and
49/50. The configuration can be changed to move fabric mode to the other
port pair; this requires a reboot of the system.
■
3Com strongly recommends that you upgrade all Switches to be
interconnected to the latest software agent.
interconnected to the latest software agent.
■
3Com recommends that you remove the configuration file from a Switch unit
that has previously been used elsewhere in your network before you
interconnect to an existing unit. If you do not do this, problems may be caused
by conflicting Switch configurations. Use the dir command from the User
View to display the configuration files stored on the Switch and locate the
[filename].cfg
that has previously been used elsewhere in your network before you
interconnect to an existing unit. If you do not do this, problems may be caused
by conflicting Switch configurations. Use the dir command from the User
View to display the configuration files stored on the Switch and locate the
[filename].cfg
file. Do NOT under any circumstances remove the
3comoscfg.def
file (this is the default configuration file).
■
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.
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 18 Stack example (using 4 units)
Unit Numbering
within the Stack
within the Stack
When a stack is created using the Switch 4500 the unit numbering can be
determined in two ways.
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.
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.
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
RPS
Duplex:Gr een = Full Duplex, Ye llow = Half Duplex
Speed:Gr een = 100Mbps, Ye llow = 10Mbps
49
50
49
50
2
25
2