交换机DHCP问题

出现DHCP获取缓慢/不可用，导致无法使用IP电话。DHCP地址池为外接服务器。出现如下告警

Mar  3 2022 18:52:09.200.1 CN_PEK_HMO_T3_L3S_01 %%01SECE/4/PORT_ATTACK_OCCUR(l)[13]:Auto port-defend started.(SourceAttackInterface=GigabitEthernet1/0/1, AttackProtocol=DHCP, VLAN=102)

Mar  3 2022 18:52:08.460.1 CN_PEK_HMO_T3_L3S_01 %%01SECE/4/PORT_ATTACK_OCCUR(l)[14]:Auto port-defend started.(SourceAttackInterface=GigabitEthernet0/0/1, AttackProtocol=DHCP, VLAN=101)

Mar  3 2022 16:57:54.780.1 CN_PEK_HMO_T3_L3S_01 %%01SECE/4/PORT_ATTACK_OCCUR(l)[78]:Auto port-defend started.(SourceAttackInterface=GigabitEthernet1/0/9, AttackProtocol=DHCP, VLAN=100)

Mar  3 2022 09:02:23.330.1 CN_PEK_HMO_T3_L3S_01 %%01SECE/4/PORT_ATTACK_OCCUR(l)[381]:Auto port-defend started.(SourceAttackInterface=GigabitEthernet1/0/9, AttackProtocol=DHCP, VLAN=300)

  ===============display auto-port-defend statistics===============
=======================================================================
Statistics on MPU:
--------------------------------------------------------------------------------
Protocol     Vlan Queue Cir(Kbps)  Pass(Packet/Byte)  Drop(Packet/Byte)
--------------------------------------------------------------------------------
dhcp         300  6     256        3326058            8130              
                                   NA                 NA                
dhcp         100  6     256        3326058            8130              
                                   NA                 NA                
--------------------------------------------------------------------------------

========================================================================== ===============display auto-port-defend cOnfiguration=============== ========================================================================== --------------------------------------------------------------------------------

 Name : default Related slot : 1 Auto-port-defend : enable Auto-port-defend sample : 5 Auto-port-defend aging-time : 300 second(s) Auto-port-defend arp-request threshold : 30 pps(enable) Auto-port-defend arp-reply threshold : 30 pps(enable) Auto-port-defend dhcp threshold : 30 pps(enable) Auto-port-defend icmp threshold : 30 pps(enable) Auto-port-defend igmp threshold : 60 pps(enable) Auto-port-defend ip-fragment threshold : 30 pps(enable)