ProCurve 3500yl Series, Руководство по управлению и настройке, Страница: 262 / 732

11-12
Power Over Ethernet (PoE) Operation
General PoE Operation
PoE Priority With Two or More Modules
Ports across two or more modules can be assigned a class priority of either
Low (the default), High , or Critical , for example, A5, B7, and C10 could all be
assigned a priority class of Critical . When power is allocated to the ports on a
priority basis, the Critical priority power requests are allocated to module A
first, then Module B, C, and so on. Next, the High priority power requests are
allocated starting with module A, then B, C, and the remaining modules in
order. Any remaining power is allocated in the same manner for the
Low
priority ports, beginning with module A though the remaining modules. If
there is not enough PoE power for all the PDs connected to PoE modules in
the switch, power is allocated according to priority class across modules. For
example:
All ports on module C are prioritized as Critical.
ProCurve(config)# interface c1-c24 power-over-ethernet
critical
All ports on module A are prioritized as
Low.
ProCurve(config)# interface a1-a24 power-over-ethernet
low
There are 48 PDs attached to all ports of modules A and C (24 ports each
module).
There is only enough PoE power for 32 ports (8.5 watts x 32 ports = 273
watts).
C22 - C24 Low In this example, the CLI command sets ports C23-C24 to Low
2
:
ProCurve(config)# interface c23-c24 power-over-ethernet low
This priority class receives power only if all PDs on ports with High and Critical priority
settings are receiving power. If there is enough power to provision PDs on only some low-
priority ports, then power is allocated to the ports in ascending order, beginning with the
lowest-numbered port in the class (port 22, in this case), until all available power is in use.
C1 - C2 - n/a - In this example, the CLI command disables PoE power on ports C1-C2:
ProCurve(config)# no interface c1-c2 power-over-ethernet
There is no priority setting for the ports in this example.
1
For a listing of PoE configuration commands, with descriptions, refer to “Configuring PoE Operation” on page 11-14.
2
In the default PoE configuration, the ports are already set to the low priority. In this case, the command is not necessary.
Port Priority
Setting Configuration Command
1
and Resulting Operation
with PDs connected to Ports C3 Through C24
3500-5400-6200-8200-MCG-Jan08-K_13_01.book Page 12 Monday, January 28, 2008 10:04 AM