案例s2128g下行用户无法动态ip地址

S2128GIP 端口，ARP-CHECK根据绑定的信息生产ARP检测条目；65对进行。网络部署正常运行一段时间后，个别用户反馈无法网络，具体现象为无法获取 功能后不再通过默认广播的方式进行动态IP地址获取，所有的DHCP报会被交换机丢弃并送交换机CPU进行检查处理。打开debugipdhcpsnoopacket对DHCP报文的交互进行观察Mar2700:38:03%7:[DHCP_SNP]:recvdhcp00e0.4c00.1b1f,srcip:0.0.0.0,destip:255.255.255.255fromport18Mar2700:38:03%7:[DHCP_SNP]:Packettype:DHCPMar2700:38:03%7:[DHCP_SNP]:op=1htype=1hlen=6hops=0xid=secs=2816flags=Mar2700:38:03%7:[DHCP_SNP]:ciaddr=0.0.0.0yiaddr=0.0.0.0siaddr0.0.0.0giaddr=0.0.0.0chaddr=00e0.4c00.1b1fMar2700:38:03%7:[DHCP_SNP]:filename=Mar2700:38:03%7:[DHCP_SNP]:server_nameMar2700:38:03%7:[DHCP_SNP]:startdealinputrequestMar2700:38:03%7:[DHCP_SNP]:forworddestmacffff.ffff.fffftoeverytrustMar2700:38:03%7:[DHCP_SNP]:forwordrequestpackettoport14,vid=pkt_lenMar2700:38:04%7:[DHCP_SNP]:recvdhcp00d0.f86c.4133,srcip:1.1.1.3,destip:255.255.255.255fromport14Mar2700:38:04%7:[DHCP_SNP]:Packettype:DHCPMar2700:38:04%7:[DHCP_SNP]:op=2htype=1hlen=6hops=0xid=secs=0flags=Mar2700:38:04%7:[DHCP_SNP]:ciaddr=0.0.0.0yiaddr=1.1.1.2siaddr0.0.0.0giaddr=0.0.0.0chaddr=00e0.4c00.1b1fMar2700:38:04%7:[DHCP_SNP]:filename=Mar2700:38:04%7:[DHCP_SNP]:server_nameMar2700:38:04%7:[DHCP_SNP]:startdealinputreplyMar2700:38:04%7:[DHCP_SNP]:forwordreplypackettoport=16,vid=10len358Mar2700:38:04%7:[DHCP_SNP]:dealoutputreplyprocessMar2700:38:18%7:[DHCP_SNP]:recvdhcp00e0.4c00.1b1f,srcip:0.0.0.0,destip:255.255.255.255fromport18Mar2700:38:18%7:[DHCP_SNP]:Packettype:DHCPMar2700:38:18%7:[DHCP_SNP]:op=1htype=1hlen=6hops=0xid=secs=6656flags=Mar2700:38:18%7:[DHCP_SNP]:ciaddr=0.0.0.0yiaddr=0.0.0.0siaddr0.0.0.0giaddr=0.0.0.0chaddr=MarMar2700:38:18%7:[DHCP_SNP]:filenameMar2700:38:18%7:[DHCP_SNP]:server_nameMar2700:38:18%7:[DHCP_SNP]:startdealinputrequestMar2700:38:18%7:[DHCP_SNP]:forwordrequestpackettoport14,vid=pkt_lenDHCPOFFERMAC生，肯定是交换机MAC表中有用户MAC与端口16的对应关系。!interfaceFastEthernet0/16switchportaccessvlan10 VlanMacAddress IPAddress 10 寝室上网可正常获取地址。回到自己寝室后发现无法获取IP地址。 B．PCA0（up/down法学习到IP地址。 PCMACVlanMacAddress IPAddress 10 Enterconfigurationcommands,oneperline.EndwithCNTL/Z.S2128G(config)#intFA0/16VlanMacAddress IPAddress S2128G#Mar2701:12:27%7:[DHCP_SNP]:recvdhcp00e0.4c00.1b1f,srcip:0.0.0.0,destip:255.255.255.255fromport18Mar2701:12:27%7:[DHCP_SNP]:Packettype:DHCPDiscoverMar2701:12:27%7:[DHCP_SNP]:op=1htype=1hlen=6hops=0xid=secs=0flags=Mar2701:12:27%7:[DHCP_SNP]:ciaddr=0.0.0.0yiaddr=0.0.0.0siaddr0.0.0.0giaddr=0.0.0.0chaddr=00e0.4c00.1b1fMar2701:12:27%7:[DHCP_SNP]:filename=Mar2701:12:27%7:[DHCP_SNP]:server_nameMar2701:12:27%7:[DHCP_SNP]:startdealinputrequestMar2701:12:27%7:[DHCP_SNP]:forworddestmacffff.ffff.fffftoeverytrustMar2701:12:27%7:[DHCP_SNP]:forwordrequestpackettoport14,vid=pkt_lenMar2701:12:28%7:[DHCP_SNP]:recvdhcp00d0.f86c.4133,srcip:1.1.1.3,destip:255.255.255.255fromport14Mar2701:12:28%7:[DHCP_SNP]:Packettype:DHCPMar2701:12:28%7:[DHCP_SNP]:op=2htype=1hlen=6hops=0xid=secs=0flags=Mar2701:12:28%7:[DHCP_SNP]:ciaddr=0.0.0.0yiaddr=1.1.1.2siaddr0.0.0.0giaddr=0.0.0.0chaddr=00e0.4c00.1b1fMar2701:12:28%7:[DHCP_SNP]:filename=Mar2701:12:28%7:[DHCP_SNP]:server_nameMar2701:12:28%7:[DHCP_SNP]:startdealinputreplyMar2701:12:28%7:[DHCP_SNP]:forwordreplypackettoport=18,vid=10len358Mar2701:12:28%7:[DHCP_SNP]:dealoutputreplyprocessMar2701:12:28%7:[DHCP_SNP]:recvdhcp00e0.4c00.1b1f,srcip:0.0.0.0,destip:255.255.255.255fromport18Mar2701:12:28%7:[DHCP_SNP]:Packettype:DHCPMar2701:12:28%7:[DHCP_SNP]:op=1htype=1hlen=6hops=0xid=secs=0flags=Mar2701:12:28%7:[DHCP_SNP]:ciaddr=0.0.0.0yiaddr=0.0.0.0siaddr0.0.0.0giaddr=0.0.0.0chaddr=00e0.4c00.1b1fMar2701:12:28%7:[DHCP_SNP]:filename=Mar2701:12:28%7:[DHCP_SNP]:server_nameMar2701:12:28%7:[DHCP_SNP]:startdealinputrequestMar2701:12:28%7:[DHCP_SNP]:forworddestmacffff.ffff.fffftoeverytrustMar2701:12:28%7:[DHCP_SNP]:forwordrequestpackettoport14,vid=pkt_lenpkt_lenMar2701:12:28%7:[DHCP_SNP]:recvdhcp00d0.f86c.4133,srcip:1.1.1.3,destip:255.255.255.255fromport14Mar2701:12:28%7:[DHCP_SNP]:Packettype:DHCPMar2701:12:28%7:[DHCP_SNP]:op=2htype=1hlen=6hops=0xid=secs=0flags=Mar2701:12:28%7:[DHCP_SNP]:ciaddr=0.0.0.0yiaddr=1.1.1.2siaddr0.0.0.0giaddr=0.0.0.0chaddr=00e0.4c00.1b1fMar2701:12:28%7:[DHCP_SNP]:filename=Mar2701:12:28%7:[DHCP_SNP]:server_nameMar2701:12:28%7:[DHCP_SNP]:startdealinputreplyMar2701:12:28%7:[