S5700 PoE接某友商AP不供电

1、检查是否支持POE供电，客户反馈设备型号是S5700S-28P-PWR-LI-AC，确认支持POE供电

2、进入接口查看信息，无法判断PD状态：

[HUAWEI-diagnose]interface gigabitethernet0/0/1 [HUAWEI-GigabitEthernet0/0/1]poe legacy enable [HUAWEI-GigabitEthernet0/0/1]display this # interface GigabitEthernet0/0/1  poe legacy enable # return [HUAWEI-GigabitEthernet0/0/1]q [HUAWEI]lldp enable Info: Global LLDP is enabled successfully. [HUAWEI] Dec  5 2017 09:17:31 HUAWEI LLDP/4/ADDCHGTRAP:OID 1.3.6.1.4.1.2011.5.25.134.2.5 Local management address is changed. (LocManAddr=48d5-391a-e6c0) [HUAWEI] Dec  5 2017 09:17:31 HUAWEI LLDP/4/ENABLETRAP:OID 1.3.6.1.4.1.2011.5.25.134.2.1 Global LLDP is enabled. [HUAWEI] Dec  5 2017 09:17:39 HUAWEI DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.25.191.3.1 configurations have been changed. The current change number is 4, the change loop count is 0, and the maximum number of records is 4095. [HUAWEI] Dec  5 2017 09:17:53 HUAWEI LLDP/4/NBRCHGTRAP:OID 1.0.8802.1.1.2.0.0.1 Neighbor information is changed. (LldpStatsRemTablesInserts=1, LldpStatsRemTablesDeletes=0, LldpStatsRemTablesDrops=0, LldpStatsRemTablesAgeouts=0)lldp enable [HUAWEI-GigabitEthernet0/0/1]lldp dot3-tlv power 802.3at   [HUAWEI-GigabitEthernet0/0/1]d                          Dec  5 2017 09:22:29 HUAWEI DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.25.191.3.1 configurations have been changed. The current change number is 5, the change loop count is 0, and the maximum number of records is 4095. [HUAWEI-GigabitEthernet0/0/1]display this # interface GigabitEthernet0/0/1  poe legacy enable  lldp dot3-tlv power 802.3at

3、客户提供POE适配器查看，输出电压是24V，电流1000mA

4、华为5700交换机采用的802.3at供电标准，对PD的要求如下：

5、可以看出客户采用的AP是非标AP，不满足802.3at输出电压37-42.5V。因此华为S5700无法给友商AP供电。