Configuring Interfaces | 123Figure 7-87. Clearing Counters: Example of Using the clear counters CommandEnabling Power over Ethernet Ports (PoE)SFTOS 2.5.1 introduces support for Power over Ethernet (PoE) functionality for the S50V switch.PoE provides the ability to transmit both electrical power and data to remote devices over standardtwisted-pair cable. SFTOS support for PoE conforms to IEEE 802.3af, which defines a standard to deliverpower over Ethernet cables.All 48 physical copper interfaces on the S50V have the capability to provide power. Some of the salientfeatures are as follows:• The total power budget for the switch is 360 watts, although the current power supply limits the actualpower available to 320 watts, depending on voltage and other factors. Each port can provide 20 wattsmaximum, subject to the power budget, voltage, and power priority and power limit settings.• Legacy devices, as well as powered devices specifically compliant with IEEE 802.3af, are supported.• When the power budget is exceeded, the next port attempting to power up causes the currently enabledport with the lowest priority to shut down if the port attempting to power up has a higher PoE priority.• Support for PoE is provided in the CLI, as well as SNMP.• SNMP support is through the Power-Ethernet MIB (POWER-ETHERNET-MIB) and the Dell Force10SFTOS-POWER-ETHERNET-MIB for snmpwalk.• Syslog messages are provided for PoE events.While each of the 48 physical copper interfaces of the S50V can provide power to attached PoE-compliantpowered devices, the total PoE power budget cannot provide all ports, at the same time, the 15.4 wattsspecified by IEEE 802.3af.If you connect powered devices to all 48 ports, they can all work at once if their total draw is less than 320watts. In order to support powered devices that require more power, the S50V uses, by default, afirst-come, first-serve method of allocating power.Force10 #clear counters 1/0/1Are you sure you want to clear the port stats? (y/n)yPort Stats Cleared.Force10 #clear counters allAre you sure you want to clear ALL port stats? (y/n)yALL Port Stats Cleared.Force10 #clear countersAre you sure you want to clear the switch stats? (y/n)ySwitch Stats Cleared.Force10 #
