Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 518

www.dell.com | support.dell.com • If there is not enough power in the budget, the configuration is maintained and port waits for power to become available. • If the maximum power for the device class is more than than the power limit you specified, FTOS does not allocate any power. Monitor the Power Budget The power budget is the amount of power available from the installed PSUs minus the power required to operate the chassis. Use the show power inline (Figure 27-2 on page 514) and show power detail (Figure 27-3 on page 515) commands to help you determine if power is available for additional PoE ports (1478.40 Watts are supplied per C-Series PSU; max of 790W on S-Series with load-sharing external DC PSU). Enabling PoE on more ports than is supported by the power budget produces one of these results: • If the newly PoE-enabled port has a lower priority, then the command is accepted, but power is not allocated to the port. In this case, the following message is displayed. Message 1 Insufficient Power to Enable PoE %Warning: Insufficient power to enable. POE oper-status set to OFF for port • If the newly PoE-enabled port has a higher priority, then the CLI is accepted, and power is terminated on the lowest priority port in the chassis. If another power supply is added to the system at a later time, both ports receive power. • If all of the lower priority ports combined cannot meet the power requirements of the newly enabled port, then the CLI is accepted, but power on the lower priority ports is not terminated, and no power is supplied to the port. The second result in this scenario is true even if a powered device is not connected to the port. Power can be allocated to a port, thus subtracting it from the power budget and making it unavailable to other ports, but that power does not have to be consumed. 518 | Power over Ethernet