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Gigabit Ethernet Switch User's Guide
Port Trunking
Port trunking is used to combine a number of ports together to make a single high-bandwidth data pipeline.
The participating parts are called members of a trunk group.
The Switch supports up to four trunk groups, the first three which may include from two to four switch ports
each. The fourth trunk group is two ports.
STA parameters
Settings
Bridge Priority
lower the #,
higher the
priority
Hello Time
1 - 10 sec.
Max. Age Time
6 - 40 sec.
Forward Delay
4 - 30 sec.
Port-level STA parameters
Enable/Disable
Enable/
Disable
Port Priority
lower the #,
higher the
priority
Table 5-1. User-selective STA parameters
Figure 5-3. Port trunking example
Effects
Comment
Increases chance of
Avoid, if the switch is
becoming the Root
used in workgroup level
Bridge
of a large network
No effect, if not
Never set greater than
Root Bridge
Max. Age Time
Compete for Root
Avoid low number for
Bridge, if BPDU is
unnecessary reset of
not received
Root Bridge
High # delays the
Max. Age 2 x
change in state
(Forward Delay - 1)
Max. Age 2 x (Hello
Time + 1)
Enable or disable
Disable a port for
this LAN segment
security or problem
isolation
Increases chance of
become Root Port
18
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