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S2128GIP 端口，ARP-CHECK根據(jù)綁定的信息生產(chǎn)ARP檢測(cè)條目；65對(duì)進(jìn)行。網(wǎng)絡(luò)部署正常運(yùn)行一段時(shí)間后，個(gè)別用戶反饋無(wú)法網(wǎng)絡(luò)，具體現(xiàn)象為無(wú)法獲取 功能后不再通過(guò)默認(rèn)廣播的方式進(jìn)行動(dòng)態(tài)IP地址獲取，所有的DHCP報(bào)會(huì)被交換機(jī)丟棄并送交換機(jī)CPU進(jìn)行檢查處理。打開(kāi)debugipdhcpsnoopacket對(duì)DHCP報(bào)文的交互進(jìn)行觀察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，肯定是交換機(jī)MAC表中有用戶MAC與端口16的對(duì)應(yīng)關(guān)系。!interfaceFastEthernet0/16switchportaccessvlan10 VlanMacAddress IPAddress 10 寢室上網(wǎng)可正常獲取地址。回到自己寢室后發(fā)現(xiàn)無(wú)法獲取IP地址。 B．PCA0（up/down法學(xué)習(xí)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:[

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