1.1简介......................................................................................................................................11.1.1DHCP服务器简介.......................................................................................................31.1.2DHCP中继简介...........................................................................................................41.1.3DHCP客户端简介.......................................................................................................41.1.4DHCPSnooping简介..................................................................................................51.2常见问题................................................................................................................................51.2.1DHCP服务器与DHCP客户端在一样物理网段，DHCP客户端无法获取地址..............51.2.2DHCP客户端无法通过DHCP中继获取地址................................................................61.2.3DHCP客户端无法通过DHCPSnooping获取地址.......................................................91.3别的相关问题........................................................................................................................91.3.1DHCP客户端没有获取到部分服务器配置的选项........................................................91.3.2禁止分配的静态绑定地址，依然参加地址分配.........................................................101.3.3开释的IP地址没有放入可分配的IP地址表中.............................................................101.3.4DHCP服务器的ping嗅探时刻与配置不相符..............................................................101.3.5DHCP服务器的租约已通过期，但DHCP中继的安全表项依然存在..........................111.3.6DHCP服务器静态绑定IP地址和客户端MAC失效.....................................................111.3.7DHCPSnooping无法生成表项.................................................................................121.4故障管理进程......................................................................................................................121.4.1DHCP服务器与DHCP客户端在一样物理网段故障管理进程.....................................121.4.2DHCP客户端通过DHCP中继获取IP地址故障管理进程............................................141.4.3DHCP客户端通过DHCPSnooping获取IP地址故障管理进程...................................161.5典型案例..............................................................................................................................181.5.1PC做为DHCP客户端获取地址时刻较长...................................................................

(1.1 Introduction ................................................ ...................................................... .................................11.1.1 Introduction to DHCP Server ............ ...................................................... .................................31.1.2 Introduction to DHCP Relay ...................................................... ...................................................... ......41.1.3 Introduction to DHCP Client ................................ ...................................................... ................41.1.4 Introduction to DHCP Snooping ................................ ...................................................... .................51.2 Frequently Asked Questions ................................. ...................................................... .................................................51.2 .1 The DHCP server is in the same physical network segment as the DHCP client, and the DHCP client cannot obtain the address............... 51.2.2 The DHCP client cannot obtain the address through the DHCP relay..... ...................................................... .........61.2.3 The DHCP client cannot obtain an address through DHCPSnooping.......................... ................................. 91.3 Other related issues..... ...................................................... ...................................................... ................91.3.1 DHCP client does not get some server-configured options................................. .................................91.3.2 The static binding address that is forbidden to be assigned still participates in address assignment. ...................................................... ......101.3.3 The released IP address is not placed in the list of allocatable IP addresses.......................... .................................101.3.4The ping sniffing time of the DHCP server does not match the configuration... ...................................................... .........101.3.5 The lease of the DHCP server has expired, but the security entries of the DHCP relay still exist.......... .....111.3.6 The DHCP server statically binds the IP address and the client MAC is invalid.......................... ................................111.3.7DHCPSnooping fails to generate an entry.......................... ...................................................... ..........121.4 Fault Management Process ................................. ...................................................... ................................121.4.1 The DHCP server and the DHCP client are in the same physical network segment fault management process.. .................................121.4.2 DHCP client obtains IP address through DHCP relay fault management process .................................141.4 .3 DHCP client obtains IP address through DHCP Snooping fault management process ................................ 161.5 Typical case ...................................................... ...................................................... ............181.5.1 It takes a long time for PC to obtain address as a DHCP client.......... ...................................................... ......)

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1.1简介......................................................................................................................................11.1.1DHCP服务器简介.......................................................................................................31.1.2DHCP中继简介...........................................................................................................41.1.3DHCP客户端简介.......................................................................................................41.1.4DHCPSnooping简介..................................................................................................51.2常见问题................................................................................................................................51.2.1DHCP服务器与DHCP客户端在一样物理网段，DHCP客户端无法获取地址..............51.2.2DHCP客户端无法通过DHCP中继获取地址................................................................61.2.3DHCP客户端无法通过DHCPSnooping获取地址.......................................................91.3别的相关问题........................................................................................................................91.3.1DHCP客户端没有获取到部分服务器配置的选项........................................................91.3.2禁止分配的静态绑定地址，依然参加地址分配.........................................................101.3.3开释的IP地址没有放入可分配的IP地址表中.............................................................101.3.4DHCP服务器的ping嗅探时刻与配置不相符..............................................................101.3.5DHCP服务器的租约已通过期，但DHCP中继的安全表项依然存在..........................111.3.6DHCP服务器静态绑定IP地址和客户端MAC失效.....................................................111.3.7DHCPSnooping无法生成表项.................................................................................121.4故障管理进程......................................................................................................................121.4.1DHCP服务器与DHCP客户端在一样物理网段故障管理进程.....................................121.4.2DHCP客户端通过DHCP中继获取IP地址故障管理进程............................................141.4.3DHCP客户端通过DHCPSnooping获取IP地址故障管理进程...................................161.5典型案例..............................................................................................................................181.5.1PC做为DHCP客户端获取地址时刻较长...................................................................

(1.1 Introduction ................................................ ...................................................... .................................11.1.1 Introduction to DHCP Server ............ ...................................................... .................................31.1.2 Introduction to DHCP Relay ...................................................... ...................................................... ......41.1.3 Introduction to DHCP Client ................................ ...................................................... ................41.1.4 Introduction to DHCP Snooping ................................ ...................................................... .................51.2 Frequently Asked Questions ................................. ...................................................... .................................................51.2 .1 The DHCP server is in the same physical network segment as the DHCP client, and the DHCP client cannot obtain the address............... 51.2.2 The DHCP client cannot obtain the address through the DHCP relay..... ...................................................... .........61.2.3 The DHCP client cannot obtain an address through DHCPSnooping.......................... ................................. 91.3 Other related issues..... ...................................................... ...................................................... ................91.3.1 DHCP client does not get some server-configured options................................. .................................91.3.2 The static binding address that is forbidden to be assigned still participates in address assignment. ...................................................... ......101.3.3 The released IP address is not placed in the list of allocatable IP addresses.......................... .................................101.3.4The ping sniffing time of the DHCP server does not match the configuration... ...................................................... .........101.3.5 The lease of the DHCP server has expired, but the security entries of the DHCP relay still exist.......... .....111.3.6 The DHCP server statically binds the IP address and the client MAC is invalid.......................... ................................111.3.7DHCPSnooping fails to generate an entry.......................... ...................................................... ..........121.4 Fault Management Process ................................. ...................................................... ................................121.4.1 The DHCP server and the DHCP client are in the same physical network segment fault management process.. .................................121.4.2 DHCP client obtains IP address through DHCP relay fault management process .................................141.4 .3 DHCP client obtains IP address through DHCP Snooping fault management process ................................ 161.5 Typical case ...................................................... ...................................................... ............181.5.1 It takes a long time for PC to obtain address as a DHCP client.......... ...................................................... ......)

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