DHCP (Dynamic Host Configuration Protocol) is a local area network network protocol that works using the UDP protocol and is widely used to dynamically allocate reusable network resources such as IP addresses. DHCP is based on the Client\/Server working mode. The DHCP client obtains the IP address from the DHCP server by sending a request message, and other configuration information. When the DHCP client and server are not on the same subnet, there must be a DHCP relay agent (DHCP Relay) to forward DHCP request and reply messages. Protocol Standard: RFC2132 DHCP Options and BOOTP Vendor Extensions. S. Alexander, R. Droms. March 1997. (Format: TXT, HTML) (Obsoletes RFC1533) (Updated by RFC3442, RFC3942, RFC4361, RFC4833, RFC5494) (Status: DRAFT STANDARD) (DOI: 10.17487\/RFC2132)<\/p>\n
SWITCH(config)# ip dhcp-server enable<\/code><\/pre>\nSWITCH(config)#no ip dhcp-server enable<\/code><\/pre>\nEnable and disable the DHCP server globally.<\/p>\n
SWITCH(config)# ip dhcp-server parameter NAME VALUE<\/code><\/pre>\nSWITCH(config)# ip dhcp-server parameter (authoritative (on|off) | server-name NAME | server-identifier IDENTIFY | default-lease-time <1-2147483648> | max-lease-time <1-2147483648> | ping-timeout-ms <1-65535> | ping-timeout <1-65535>)<\/code><\/pre>\nSWITCH(config)# no ip dhcp-server parameter NAME<\/code><\/pre>\nSWITCH(config)# no ip dhcp-server parameter (authoritative | server-name | server-identifier | default-lease-time | max-lease-time | ping-timeout-ms | ping-timeout)<\/code><\/pre>\nGlobal parameter configuration. When parameter values conflict, global parameters take precedence over parameters for subnets and address pools with more precise ranges. Default lease time: 43200s\/12h. Optional.<\/p>\n
SWITCH(config)# ip dhcp-server option NAME VALUE<\/code><\/pre>\nSWITCH(config)# ip dhcp-server option (routers A.B.C.D | domain-name NAME | domain-name-servers A.B.C.D | capwap-ac-v4 A.B.C.D)<\/code><\/pre>\nSWITCH(config)# no ip dhcp-server option NAME<\/code><\/pre>\nSWITCH(config)# no ip dhcp-server option (routers | domain-name | domain-name-servers | capwap-ac-v4)<\/code><\/pre>\nGlobal option configuration. When option values conflict, global options take precedence over options for subnets and address pools with more precise ranges. Optional.<\/p>\n
SWITCH(config)# ip dhcp-server custom-space NAME [code width <1-4>] [length width <1-4>] [hash size <1-65535>]<\/code><\/pre>\nSWITCH(config)#no ip dhcp-server custom-space NAME<\/code><\/pre>\nConfigure custom domain information fields. Optional.<\/p>\n
SWITCH(config)# ip dhcp-server custom-option NAME code <1-255> (boolean|integer|ip-address|text|string|encapsulate)<\/code><\/pre>\nSWITCH(config)#no ip dhcp-server custom-option NAME<\/code><\/pre>\nConfigure custom options fields. The configured custom option code value cannot conflict with the configured common options. Optional.<\/p>\n
SWITCH(config)# ip dhcp-server force-option <1-255><\/code><\/pre>\nSWITCH(config)#no ip dhcp-server force-option <1-255><\/code><\/pre>\nConfigure mandatory options fields. Optional.<\/p>\n
SWITCH(config)# ip dhcp-server static-lease NAME XX:XX:XX:XX:XX:XX A.B.C.D<\/code><\/pre>\nSWITCH(config)#no ip dhcp-server static-lease NAME<\/code><\/pre>\nConfigure static address binding. Optional.<\/p>\n
SWITCH(config)# ip dhcp-server whitelist NAME XX:XX:XX:XX:XX:XX<\/code><\/pre>\nSWITCH(config)#no ip dhcp-server whitelist NAME<\/code><\/pre>\nConfigure the whitelist. Optional.<\/p>\n
SWITCH(config)# ip dhcp-server blacklist NAME XX:XX:XX:XX:XX:XX<\/code><\/pre>\nSWITCH(config)#no ip dhcp-server blacklist NAME<\/code><\/pre>\nConfigure the blacklist. Optional.<\/p>\n
SWITCH(config)# ip dhcp-server class NAME match EXP<\/code><\/pre>\nSWITCH(config)#no ip dhcp-server class NAME<\/code><\/pre>\nConfigure custom classification. For professional usage, please configure it under the guidance of technicians. Example: ip dhcp-server class win_pc match " substring (option vendor-class-identifier,0,4)=MSFT " Optional.<\/p>\n
Subnet Configuration Command<\/h2>\n\n- Configuring Subnet Information<\/li>\n<\/ul>\n
SWITCH(config)# ip dhcp-server subnet A.B.C.D\/M<\/code><\/pre>\nSWITCH(config)#no ip dhcp-server subnet A.B.C.D\/M<\/code><\/pre>\nConfigure subnet information and enter subnet configuration mode. At least one correct subnet configuration is required for the server to start normally.<\/p>\n
SWITCH(config-dhcp-subnet)# range A.B.C.D A.B.C.D<\/code><\/pre>\nSWITCH(config-dhcp-subnet)#no range A.B.C.D<\/code><\/pre>\nConfigure the address range of the subnet. The server needs at least one assignable address range to start normally, which can be configured in the address pool below. Can be configured multiple times, with different ranges.<\/p>\n
SWITCH(config-dhcp-subnet)# parameter NAME VALUE<\/code><\/pre>\nSWITCH(config-dhcp-subnet)# parameter (authoritative (on|off) | server-name NAME | server-identifier IDENTIFY | default-lease-time <1-2147483648> | max-lease-time <1-2147483648> | ping-timeout-ms <1-65535> | ping-timeout <1-65535>)<\/code><\/pre>\nSWITCH(config-dhcp-subnet)#no parameter NAME<\/code><\/pre>\nSWITCH(config-dhcp-subnet)#no parameter (authoritative | server-name | server-identifier | default-lease-time | max-lease-time | ping-timeout-ms | ping-timeout)<\/code><\/pre>\nConfiguration parameter information. Optional.<\/p>\n
SWITCH(config-dhcp-subnet)# option NAME VALUE<\/code><\/pre>\nSWITCH(config-dhcp-subnet)# option (routers A.B.C.D | domain-name NAME | domain-name-servers A.B.C.D | capwap-ac-v4 A.B.C.D)<\/code><\/pre>\nSWITCH(config-dhcp-subnet)#no option NAME<\/code><\/pre>\nSWITCH(config-dhcp-subnet)#no option (routers | domain-name | domain-name-servers | capwap-ac-v4)<\/code><\/pre>\nConfiguration option information. It is usually necessary to configure the gateway routing address and DNS server address of the subnet. Optional.<\/p>\n
Address Pool Configuration Command<\/h2>\n\n- Configuring Address Pool Information<\/li>\n<\/ul>\n
SWITCH(config-dhcp-subnet)# pool NAME<\/code><\/pre>\nSWITCH(config-dhcp-subnet)#no pool NAME<\/code><\/pre>\nConfigure the address pool in subnet mode. Subnets can be further divided through the address pool and used on demand. Optional.<\/p>\n
SWITCH(config-dhcp-pool)# range A.B.C.D A.B.C.D<\/code><\/pre>\nSWITCH(config-dhcp-pool)#no range A.B.C.D<\/code><\/pre>\nConfigure the address range of the address pool. The server needs at least one assignable address range to start normally, which can be configured in the above subnet. Can be configured multiple times, with different ranges.<\/p>\n
SWITCH(config-dhcp-pool)# parameter NAME VALUE<\/code><\/pre>\nSWITCH(config-dhcp-pool)# parameter (authoritative (on|off) | server-name NAME | server-identifier IDENTIFY | default-lease-time <1-2147483648> | max-lease-time <1-2147483648> | ping-timeout-ms <1-65535> | ping-timeout <1-65535>)<\/code><\/pre>\nSWITCH(config-dhcp-pool)#no parameter NAME<\/code><\/pre>\nSWITCH(config-dhcp-pool)#no parameter (authoritative | server-name | server-identifier | default-lease-time | max-lease-time | ping-timeout-ms | ping-timeout)<\/code><\/pre>\nConfiguration parameter information. Optional.<\/p>\n
SWITCH(config-dhcp-pool)# option NAME VALUE<\/code><\/pre>\nSWITCH(config-dhcp-pool)# option (routers A.B.C.D | domain-name NAME | domain-name-servers A.B.C.D | capwap-ac-v4 A.B.C.D)<\/code><\/pre>\nSWITCH(config-dhcp-pool)#no option NAME<\/code><\/pre>\nSWITCH(config-dhcp-pool)#no option (routers | domain-name | domain-name-servers | capwap-ac-v4)<\/code><\/pre>\nConfiguration option information. It is usually necessary to configure the gateway routing address and DNS server address of the address pool. Optional.<\/p>\n
SWITCH(config-dhcp-pool)# (allow|deny|ignore) CLASSNAME<\/code><\/pre>\nSWITCH(config-dhcp-pool)# (allow|deny|ignore) (known-clients|unknown-clients|bootp|duplicates|declines)<\/code><\/pre>\nSWITCH(config-dhcp-pool)# no (allow|deny|ignore) (CLASSNAME|known-clients|unknown-clients|bootp|duplicates|declines)<\/code><\/pre>\nConfigure the address pool filter conditions. Custom CLASSNAME refer to the Configuring Custom Classifications section in the global configuration. Optional.<\/p>\n
Examples<\/h2>\nGeneral DHCP Server Address Assignment Scenario<\/h2>\n
\u200f \u2022 Requirement See the description of the network diagram. \u200f \u2022 Network Diagram Figure281 DHCP server typical network diagram Description: The MAC address of PC3 during the test is 00:0E:C6:C1:38:41 \u200f \u2022 Typical Configuration Example S1:<\/p>\n
SWITCH(config)# ip dhcp-server subnet 192.168.100.0\/24<\/code><\/pre>\nSWITCH(config-dhcp-subnet)#range 192.168.100.2 192.168.100.254<\/code><\/pre>\nSWITCH(config-dhcp-subnet)#option routers 192.168.100.1<\/code><\/pre>\nSWITCH(config-dhcp-subnet)#exit<\/code><\/pre>\nSWITCH(config)# ip dhcp-server subnet 192.168.200.0\/24<\/code><\/pre>\nSWITCH(config-dhcp-subnet)#range 192.168.200.2 192.168.200.254<\/code><\/pre>\nSWITCH(config-dhcp-subnet)#option routers 192.168.200.1<\/code><\/pre>\nSWITCH(config-dhcp-subnet)#exit<\/code><\/pre>\nSWITCH(config)# ip dhcp-server static-lease pc3 00:0E:C6:C1:38:41 192.168.200.2<\/code><\/pre>\nSWITCH(config)#ip dhcp-server option domain-name-servers 114.114.114.114<\/code><\/pre>\nSWITCH(config)#ip dhcp-server enable<\/code><\/pre>\nS2\/S3: Empty configuration transparent transmission. \u200f \u2022 Requirement See the description of the network diagram. \u200f \u2022 Network Diagram Figure 282 DHCP server typical network diagram \u200f \u2022 Typical Configuration Example S1:<\/p>\n
SWITCH(config)# ip dhcp-server custom-space dkwl code width 1 length width 1<\/code><\/pre>\nSWITCH(config)# ip dhcp-server custom-option dkwl.name code 1 string<\/code><\/pre>\nSWITCH(config)# ip dhcp-server custom-option dkwl.ip code 2 ip-address<\/code><\/pre>\nSWITCH(config)# ip dhcp-server custom-option vendor_dkwl code 43 encapsulate dkwl<\/code><\/pre>\nSWITCH(config)# ip dhcp-server option dkwl.ip 1.1.1.1<\/code><\/pre>\nSWITCH(config)# ip dhcp-server option dkwl.name "dockeer"<\/code><\/pre>\nSWITCH(config)# ip dhcp-server subnet 192.168.100.0\/24<\/code><\/pre>\nSWITCH(config-dhcp-subnet)#range 192.168.100.2 192.168.100.254<\/code><\/pre>\nSWITCH(config-dhcp-subnet)#option routers 192.168.100.1<\/code><\/pre>\nSWITCH(config-dhcp-subnet)#exit<\/code><\/pre>\nSWITCH(config)#ip dhcp-server option domain-name-servers 114.114.114.114<\/code><\/pre>\nSWITCH(config)#ip dhcp-server enable<\/code><\/pre>\nA DHCP Server Address Assignment Scenario that Supports Guest Separation<\/h2>\n
\u200f \u2022 Requirement<\/p>\n
\n- See the description of the network diagram.<\/li>\n
- Normal user allocation addresses 192.168.100.2-192.168.100.100 and 192.168.200.2-192.168.200.100.<\/li>\n
- Guest assigned address 192.168.100.200-192.168.100.254.<\/li>\n<\/ul>\n
\u200f \u2022 Network Diagram Figure 283 DHCP server typical network diagram \u200f \u2022 Typical Configuration Example S1:<\/p>\n
SWITCH(config)# ip dhcp-server subnet 192.168.100.0\/24<\/code><\/pre>\nSWITCH(config-dhcp-subnet)#range 192.168.100.2 192.168.100.100<\/code><\/pre>\nSWITCH(config-dhcp-subnet)#option routers 192.168.100.1<\/code><\/pre>\nSWITCH(config-dhcp-subnet)#exit<\/code><\/pre>\nSWITCH(config)# ip dhcp-server subnet 192.168.200.0\/24<\/code><\/pre>\nSWITCH(config-dhcp-subnet)#pool employee<\/code><\/pre>\nSWITCH(config-dhcp-pool)#range 192.168.200.2 192.168.200.100<\/code><\/pre>\nSWITCH(config-dhcp-pool)#deny unknown-clients<\/code><\/pre>\nSWITCH(config-dhcp-pool)#pool guest<\/code><\/pre>\nSWITCH(config-dhcp-pool)#range 192.168.200.200 192.168.200.254<\/code><\/pre>\nSWITCH(config-dhcp-pool)#allow unknown-clients<\/code><\/pre>\nSWITCH(config-dhcp-pool)#exit<\/code><\/pre>\nSWITCH(config-dhcp-subnet)#option routers 192.168.200.1<\/code><\/pre>\nSWITCH(config-dhcp-subnet)#exit<\/code><\/pre>\nSWITCH(config)#ip dhcp-server option domain-name-servers 114.114.114.114<\/code><\/pre>\nSWITCH(config)#ip dhcp-server enable<\/code><\/pre>\nS2\/S3: Empty configuration transparent transmission.<\/p>\n
Display Information<\/h2>\n\n- Display DHCP Server Status Information<\/li>\n<\/ul>\n
SWITCH#show ip dhcp-server status<\/code><\/pre>\nDHCP Server: Enable (conf.Enable)<\/p>\n
SWITCH#show ip dhcp-server leases<\/code><\/pre>\nName MAC IP Begin End Manufacturer<\/h2>\n
——————– ——————– — —————– ——————– ————- ——- ——————– liulang-work 00:0e:c6:c1:38:4a 3.3.3.254 1970-01-01 00:00:36 1970-01-01 00:10:36 ASIX ELECTRONICS CORP.<\/p>\n","protected":false},"excerpt":{"rendered":"
Networking \u203a Switching \u203a Edge \u203a Synapse<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":6349,"menu_order":28,"comment_status":"open","ping_status":"closed","template":"","doc_tag":[115,119,116],"class_list":["post-6377","docs","type-docs","status-publish","hentry","doc_tag-connexite","doc_tag-network","doc_tag-synapse-cli-documentation","no-post-thumbnail"],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.connexite.co.uk\/index.php\/wp-json\/wp\/v2\/docs\/6377","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/docs.connexite.co.uk\/index.php\/wp-json\/wp\/v2\/docs"}],"about":[{"href":"https:\/\/docs.connexite.co.uk\/index.php\/wp-json\/wp\/v2\/types\/docs"}],"author":[{"embeddable":true,"href":"https:\/\/docs.connexite.co.uk\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.connexite.co.uk\/index.php\/wp-json\/wp\/v2\/comments?post=6377"}],"version-history":[{"count":1,"href":"https:\/\/docs.connexite.co.uk\/index.php\/wp-json\/wp\/v2\/docs\/6377\/revisions"}],"predecessor-version":[{"id":6425,"href":"https:\/\/docs.connexite.co.uk\/index.php\/wp-json\/wp\/v2\/docs\/6377\/revisions\/6425"}],"up":[{"embeddable":true,"href":"https:\/\/docs.connexite.co.uk\/index.php\/wp-json\/wp\/v2\/docs\/6349"}],"wp:attachment":[{"href":"https:\/\/docs.connexite.co.uk\/index.php\/wp-json\/wp\/v2\/media?parent=6377"}],"wp:term":[{"taxonomy":"doc_tag","embeddable":true,"href":"https:\/\/docs.connexite.co.uk\/index.php\/wp-json\/wp\/v2\/doc_tag?post=6377"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}