Dhcp relay huawei Run: ip address ip-address { mask | mask-length } An IP address is assigned to the interface. 在网络中可以在DHCP中继上直接向服务器发送Release报文请求释放服务器给某客户端分配的IP地址，而不需要由客户端发起Release请求。可以通过在DHCP中继上配置Relay释放命令实现服务器对客户端的地址释放操作。 如果DHCP服务器和客户端不在一个子网内，则需要通过 dhcp select relay 命令使能DHCP中继功能将DHCP报文转发到外部的DHCP服务器。 配置影响 当执行该命令使能DHCP中继功能后，将由外部DHCP服务器为DHCP客户端分配IP地址。 Feb 28, 2019 · Enterprise Products, Solutions and Services for Enterprise; Consumer Smartphones, PC & Tablets, Wearables and More; Corporate About Huawei, Press & Events , and More The DHCP relay function is configured on the user-side gateway interface typically. (Optional) Run: dhcp relay trust option82. Run: If the DHCP relay agent connects to a special client whose TTL value of DHCP Discovery messages is 1, and if there are routing devices between the DHCP relay agent and DHCP server, run the dhcp set ttl ttl-value command to specify a fixed TTL value (16 is recommended) for DHCP Discovery messages after they are forwarded by the DHCP relay agent Mar 17, 2024 · 1. After receiving a DHCP Discover message or a Request message, the When the DHCP server and clients belong to different network segment, the DHCP relay needs to be configured. Using the undo dhcp relay trust option82 command, the DHCP relay agent discards the packet. 0/24 is used as an example to describe how to configure a DHCP relay agent. # Configure the DHCP relay function on VLANIF 10 and set the IP address to be encapsulated as the source IP address in DHCP request messages to 10. H3C交换机. However, the value of the hops field increases by 1 each time the DHCP request Usage Scenario. The DHCP relay function is configured on the user-side gateway interface typically. How to Configure DHCP? Troubleshooting Cases for DHCP Relay - Huawei Technical Support To ensure that a DHCP server can forward DHCP packets to a DHCP relay agent, you must configure a route to the DHCP relay agent on the DHCP server. By default, no DHCP server address on an interface enabled with DHCP relay is configured. If the DHCP relay agent receives an Ack message from a DHCP server after this function is enabled, the DHCP relay agent detects the IP address to be allocated to a DHCP client in the message and the client's MAC address, and checks whether the addresses are consistent with the corresponding user entry. By default, a DHCP relay agent does not trust Option 82. Disable: The proxy mode of the DHCP relay agent is disabled. 100 mac-address 286e-d488-b684 dhcp server lease day 30 hour 0 minute 0 dhcp server dns-list 10. Status of the proxy mode on the DHCP relay agent, which can be: Enable: The proxy mode of the DHCP relay agent is enabled. 先配置DHCP服务器 [huawei] dhcp enable [huawei] interface vlanif 1 [huawei-Vlanif1] dhcp select relay [huawei-Vlanif1] dhcp relay server-select 192. 一、dhcp relay概述. 如图8-15所示，dhcp客户端在网络a中，而dhcp服务器在网络b中。 当dhcp客户端需要dhcp服务器为其分配ip地址等配置信息时，则必须通过在dhcp relay上配置dhcp中继功能来实现dhcp报文的转发，从而保证dhcp客户端与dhcp服务器之间dhcp报文互通，获得ip地址。 Jan 30, 2020 · [Huawei]dhcp en. 此命令应用于DHCP中继。客户端发送的DHCP请求报文通过DHCP中继发送到DHCP服务器时，可执行 dhcp relay server-select 命令指定DHCP中继对应的DHCP服务器组，从而配置DHCP中继所代理的DHCP服务器地址。 Loading Loading The dhcp relay server-ip command configures a DHCP server address on an interface enabled with DHCP relay. dhcp relay server-select. DHCP relay agent running information of interface if. 3. 2. The most important point, which is usually forgotten, is the activation of the DHCP service. Run: quit. This video demonstrates how to configure a DHCP server and a DHCP relay agent. After the undo dhcp enable command is run, all DHCP-related Nov 4, 2021 · Syslog server: uploads user logs recorded during the DHCP-based deployment process to the network management system (NMS). For this, please consult the DHCP server manual. The DHCP server group then assigns IP addresses to users using the DHCP relay agent. To allow a DHCP relay agent to request a DHCP server to release a DHCP client IP address so that the client can log out, run the dhcp relay release command. In this case, you can run the dhcp relay release command to configure a DHCP relay agent to send a DHCP release message to the DHCP server. dhcp relay server-ip. MA5800 OLT supports DHCP Layer 2 and Layer 3 relay as Файл конфигурации SwitchA # sysname SwitchA # vlan batch 100 200 # dhcp enable # dhcp relay server group dhcpgroup1 server 10. dhcp relay reply forward all enable. These functions take effect only after the dhcp enable command is run. The easiest way is described here. DHCP relay agent: forwards DHCP messages when the device to be deployed and the DHCP server are on different network segments. 应用场景. 1 Feb 28, 2019 · When the DHCP server and clients belong to different network segment, the DHCP relay needs to be configured. If the DHCP server and client are on the same network segment, they can directly communicate with each other using DHCP. 2 : Server IP address [01] : 192. The original manual for this router can be found Enterprise Products, Solutions and Services for Enterprise; Consumer Smartphones, PC & Tablets, Wearables and More; Corporate About Huawei, Press & Events , and More To ensure that a DHCP relay agent can forward DHCP packets to a DHCP server, run the dhcp relay server-select or dhcp relay server-ip command on the DHCP relay-enabled interface to configure the correct IP address of the DHCP server. 1 to 10. SwitchA的配置文件 # sysname SwitchA # vlan batch 100 200 # dhcp enable # dhcp relay server group dhcpgroup1 server 10. 1 DHCP relay agent running information of interface GigabitEthernet0/0/0. This enables the DHCP server to allocate a proper IP address and other configurations to the DHCP client, implementing security control on the DHCP client. Run the dhcp select relay command in the interface view to enable the DHCP relay function. This command is used on the DHCP relay agent to enable the Option 82 function. dhcp relay trust option82. When receiving the message, the DHCP relay agent processes and unicasts the message to the specified DHCP server on the other network segment. Configuration Impact. 10. If a third-party device is used as the DHCP relay agent, see the operation guide of the third-party DHCP server and DHCP relay agent. When no interface address pool is Apr 4, 2018 · [DHCP-Relay]dis dhcp relay all DHCP relay agent running information of interface GigabitEthernet0/0/0. 2、配置DHCP中继的轮询功能 [Huawei]ip relay address cycle. A DHCP client broadcasts DHCP Discover messages and all devices on the network segment will receive these messages. 1 0 # interface Vlanif100 ip address 10. The DHCP relay function applies to large networks with many sparsely-distributed user gateways. Indicates the IP address of the DHCP server agented by the DHCP relay agent. 1 # 内网PC可以通过DHCP中继从DHCP服务器上申请到IP地址等相关配置信息。 When the network where a DHCP client resides does not have a DHCP server, a DHCP relay agent can be configured to forward DHCP messages of the client to a DHCP server. Run the system-view command to enter the system view. To specify the parameter, run the dhcp relay server-select command. Run dhcp server group group-name The dhcp relay server-ip command configures a DHCP server address on an interface enabled with DHCP relay. After receiving the message, the DHCP server sets the status of the IP address to idle. Run: interface interface-type interface-number The interface view is displayed. To configure this item, run the dhcp relay reply forward all enable command. The DHCP server IP address is configured on the DHCP relay agent. Before the IP address lease expires, the DHCP server will not assign the user's IP address to another client, wasting IP addresses. For more information on DHCP, click: What is DHCP(dynamic host configuration protocol) How does DHCP work . After receiving a DHCP Request message from a DHCP client, a DHCP server assigns an IP address from the local address pool to the client. 对于dhcp客户端通过中继设备向dhcp服务器申请地址的场景，如果dhcp客户端使用同一mac地址从不同子接口分别通过bras和dhcp relay申请不同网段的地址，则中继设备收到dhcp服务器的回应报文后，由于bras和dhcp relay表项的mac地址相同，可能会将回程报文发送给bas用户 当客户端与dhcp服务器不在同一网段时，可以通过在中继设备的接口上配置dhcp relay作为中继代理。这样从客户端发送来的dhcp请求可以通过dhcp中继转发到跨网段的dhcp服务器，dhcp服务器接到报文后将会为客户端分配ip地址。 Feb 1, 2021 · Overview This article is to assist with setting up OpenDNS on a Huawei HG8245H router. Configure DHCP exclusion (IP addresses that should not be allocated, eg. DHCP Snooping设备或DHCP Relay通过在DHCP请求报文中添加option82选项，将DHCP客户端的精确位置信息发送给DHCP服务器，从而使得DHCP服务器能够为DHCP客户端分配合适的IP地址和其他配置信息，实现对DHCP客户端的安全控制。 dhcp中继转发dhcp discover报文时，不会检查dhcp服务器的状态是否down。接口下同时配置多个dhcp服务器的ip地址时，会有多个服务器回应dhcp offer报文，但dhcp客户端一般只使用第一个收到的报文，这样会造成第一个服务器ip地址池紧张而其他服务器空闲的情况。 应用场景. dhcp中继转发dhcp discover报文时，不会检查dhcp服务器的状态是否down。接口下同时配置多个dhcp服务器的ip地址时，会有多个服务器回应dhcp offer报文，但dhcp客户端一般只使用第一个收到的报文，这样会造成第一个服务器ip地址池紧张而其他服务器空闲的情况。 (Optional) Perform the following steps on the DHCP relay agent: If the unconfigured device and DHCP server are on different network segments, configure a DHCP relay agent to forward DHCP packets exchanged between them. How to configure DHCP Relay Agent using Huawei CLI? Let’s assume that we have the following topology: We want our PC to acquire its IP address from the The dhcp enable command is the prerequisite for configuring DHCP-related functions, including DHCP relay, DHCP snooping, and DHCP server. 1 255. Bind DHCP servers to a DHCP server group. If a Huawei device is used as the DHCP relay agent, see "DHCPv4 Configuration" or "DHCPv6 Configuration" in CLI Configuration Guide > IP Address and Service Configuration. Sep 26, 2021 · 好的，这是一个华为DHCP中继的配置实例： 1. Configuring DHCP DHCP configuration includes configuration of a DHCP server, configuration of DHCP clients, and optional configuration of DHCP relay agents and BOOTP clients. 1 Conclusions and Suggestions When the PXE clients and WDS server are on different network segments, the DHCP relay agent is required to forward DHCP packets to the WDS server. 组网需求. 21. 1的DHCP服务器发送Release报文，请求释放MAC地址为00e0-fc34-2000的客户端申请到的IP地址192. Example # Configure Option 125 with the enterprise code as 2011 and string as ZJCTCIPTVDHCPAAA for an address pool named huawei. ; Multiple interfaces can be configured with the same DHCP server group, and one interface can be configured with only one DHCP server group. Run the display dhcp relay statistics command to check message statistics on all DHCP relay agents besides DHCP relay agents connected to DHCP servers in the DHCP server group. SwitchA的配置文件 # sysname SwitchA # vlan batch 100 200 # dhcp enable # interface Vlanif100 ip address 10. To specify the parameter, run the dhcp select relay proxy-mode command. By default, no DHCP server IP address is configured on an interface enabled with DHCP relay. IP Packets Product Documentation contains the main data transmission protocol used in a variety of packet formats, packet example. DHCP relay agent configuration of the if interface. 华为交换机 2. 此命令应用于DHCP中继。客户端发送的DHCP请求报文通过DHCP中继发送到DHCP服务器时，可执行 dhcp relay server-select 命令指定DHCP中继对应的DHCP服务器组，从而配置DHCP中继所代理的DHCP服务器地址。 After receiving DHCP Request messages from clients, the DHCP relay agent modifies the source/destination IP addresses and MAC addresses, and unicasts the messages to the authorized DHCP server. com/info-finder/en dhcp enable DHCP is enabled. "Feature Typical Configuration Examples" provides typical configuration examples of a single feature on a switch. 10 [VTEP2-Vbdif10] dhcp relay giaddr source-interface loopback 应用场景. dhcp set ttl. In this lab session, I will guide you through configuring DHCP r By default, a DHCP relay agent does not trust Option 82. 此命令应用于DHCP中继。客户端发送的DHCP请求报文通过DHCP中继发送到DHCP服务器时，可执行 dhcp relay server-select 命令指定DHCP中继对应的DHCP服务器组，从而配置DHCP中继所代理的DHCP服务器地址。. (Optional) Perform the following steps on the DHCP relay agent: If the unconfigured device and DHCP server are on different network segments, configure a DHCP relay agent to forward DHCP packets exchanged between them. The DHCP client has obtained the IP address of the DHCP server in the address allocation phase. "Campus Networks Typical Configuration Examples" provides typical campus network networking modes and a variety of deployment examples. The DHCP relay function has been enable using the dhcp select relay command so that the system can forward DHCP packets to the specified DHCP server. 配置文件. When the DHCP client and server are on different network segments, the DHCP relay agent must be configured. This command allows a DHCP relay agent to use a secondary IP address as the gateway address to apply for IP addresses for users when it fails to use the primary IP address to apply for IP addresses. 当dhcp服务器和dhcp客户端都在同一个网段内，则dhcp服务器和dhcp客户端之间可以直接进行dhcp协议的报文交互，这时不需要dhcp中继设备。 如果DHCP服务器和DHCP客户端不在同一网段内，则需要DHCP中继设备启动DHCP中继功能，以完成DHCP报文的转发。 (Optional) Perform the following steps on the DHCP relay agent: If the unconfigured device and DHCP server are on different network segments, configure a DHCP relay agent to forward DHCP packets exchanged between them. 在三层分布式VXLAN网关场景，DHCP用户通过网关上部署的DHCP Relay从不同子网的DHCP Server获取地址。由于同一子网的用户网关地址都相同，如果DHCP Server使用网关地址作为应答报文的目的地址，会使报文不能回应到用户所在的网关上，导致用户上线失败。 A DHCP snooping-enabled device or a DHCP relay agent adds Option 82 to a DHCP request message to send the accurate location of a DHCP client to the DHCP server. In this video, I will demonstrate How to Configure DHCP (DHCP Relay). After receiving DHCP Request messages from clients, the DHCP relay agent modifies the source/destination IP addresses and MAC addresses, and unicasts the messages to the authorized DHCP server. If the user and the DHCP server are located in different VPNs, the DHCP server fails to use this relay agent address to communicate with the Key Concepts of DHCP How DHCP Works Licensing Requirements and Limitations for DHCP This section provides licensing requirements and limitations when configuring DHCP. Description. When this function is enabled, the DHCP relay agent can receive and forward DHCP messages that carry Option 82. 0 # interface GigabitEthernet 0/0/1 port link-type hybrid port hybrid pvid vlan 200 port hybrid untagged vlan 200 # interface GigabitEthernet (Optional) Perform the following steps on the DHCP relay agent: If the unconfigured device and DHCP server are on different network segments, configure a DHCP relay agent to forward DHCP packets exchanged between them. 1 dhcp server static-bind ip-address 10. 1 : Server IP address [01] : 192. 10) If the dhcp option82 vendor-specific format command has been run, the Sub9 of the new format cannot be inserted into Option 82. By IP Packets Product Documentation, be able to enhance understanding of various protocol packets. After receiving a DHCP packet that carries the Option 82 field but the giaddr field of the packet is 0, the DHCP relay agent processes the packet by default. If the DHCP request message passes through multiple DHCP relay agents before reaching the DHCP server, the value of this field is the IPv4 address of the first DHCP relay agent and remains unchanged. 1 dhcp server Planning DHCP Servers. How to configure DHCP Relay Agent using Huawei CLI? Let’s assume that we have the following topology: We want our PC to acquire its IP address from the DHCP Relay支持向DHCP服务器发送Release报文. Follow-up Procedure After detecting incorrect message statistics on a DHCP relay agent, run the reset dhcp relay statistics [ server-group group-name ] command to clear When a DHCP relay agent receives a request packet from a DHCP client, the relay agent adds the IP address of the interface that receives the request packet to the GIADDR field of the packet to identify the network segment where the client resides. When multiple DHCP servers or DHCP relay agents are deployed on a network segment, the client accepts only the first DHCP Offer message it receives and therefore may obtain an unexpected IP address. 168. Both the dhcpv6 relay source-ip-address and dhcpv6 relay source-interface commands can specify the source IP address used by a DHCP relay agent to forward messages. [SwitchA] display dhcp relay interface vlanif 100 DHCP relay agent running information of interface Vlanif100 : Server IP address [00] : 10. # On SwitchA, run the display dhcp relay interface vlanif 100 command to view the configuration of the DHCP relay agent. 255 [VTEP2-LoopBack2] quit [VTEP2] dhcp enable [VTEP2] interface vbdif 10 [VTEP2-Vbdif10] dhcp select relay [VTEP2-Vbdif10] dhcp relay server-ip 192. dhcp中继转发dhcp discover报文时，不会检查dhcp服务器的状态是否down。接口下同时配置多个dhcp服务器的ip地址时，会有多个服务器回应dhcp offer报文，但dhcp客户端一般只使用第一个收到的报文，这样会造成第一个服务器ip地址池紧张而其他服务器空闲的情况。 Empresa Productos, soluciones y servicios para el segmento Empresas; Consumidor Smartphones, ordenadores, tabletas, ponibles, etc. 1 dhcp中继转发dhcp discover报文时，不会检查dhcp服务器的状态是否down。接口下同时配置多个dhcp服务器的ip地址时，会有多个服务器回应dhcp offer报文，但dhcp客户端一般只使用第一个收到的报文，这样会造成第一个服务器ip地址池紧张而其他服务器空闲的情况。 dhcp relay request server-match enable. Run: dhcp enable DHCP is enabled. 100 Gateway address in use : 172. 0 dhcp select relay dhcp relay binding server group dhcpgroup1 # interface Vlanif200 ip address 10. Prerequisites 应用场景. Server IP address [x] To configure this item, run the dhcp relay gateway-switch enable command. Nov 4, 2024 · If DHCP snooping is enabled on a DHCP relay agent, a trusted interface does not need to be configured on the DHCP relay agent. The DHCP server then can assign the released IP address to another client. If the DHCP relay agent is disabled from trusting Option 82 using the undo dhcp relay trust option82 command, the device discards the DHCP messages carrying Option 82. 255. 三、设置dhcp relay 1. 已执行命令 dhcp relay detect enable 使能了DHCP中继探测用户表项功能。 The dhcp relay release command applies to DHCP relay agents. 在DHCP Relay上执行命令 ping ，检查DHCP Relay接口和DHCP Server之间网络是否可达，不可达时需要排除网络连接及路由问题。 检查安全策略配置是否正确，即需将接口加入安全区域，打开DHCP Relay接口所在安全区域和Local域之间的安全策略，允许报文在域间通过。 Welcome to our tech lab! Dive into practical networking configurations and tutorials with us. DHCP is a very important feature we have in Huawei Routers to be able to provide IP addresses automatically to the connected hosts whether they are in the same network of the DHCP server or in another network which is not directly connected to the DHCP server. To ensure that a DHCP server can forward DHCP packets to a DHCP relay agent, you must configure a route to the DHCP relay agent on the DHCP server. DHCP Relay Enable. For more information about DHCP: https://info. Activate DHCP service [HUAWEI] dhcp enable. dhcp中继转发dhcp discover报文时，不会检查dhcp服务器的状态是否down。接口下同时配置多个dhcp服务器的ip地址时，会有多个服务器回应dhcp offer报文，但dhcp客户端一般只使用第一个收到的报文，这样会造成第一个服务器ip地址池紧张而其他服务器空闲的情况。 Configuration Files. 0 dhcp select relay //The DHCP relay function is enabled DHCP中继检查用户表项功能使能后，会自动生成动态的用户地址表项。可以通过display dhcp relay user-table命令查看到DHCP客户端对应的IP地址、MAC地址、VLAN和相连的三层接口索引。 前置条件. 1。 In a scenario where a DHCP client applies for IP addresses from the DHCP server through a DHCP relay agent, if the DHCP client uses the same MAC address but different sub-interfaces to request for IP addresses in different network segments through the BRAS and DHCP relay agent, the DHCP relay agent may send return messages to the BAS user upon The DHCP relay agent then forwards the message to the client. Run the dhcp enable command to enable DHCP. If the DHCP server and client are on different network segments, the DHCP relay function must be enabled to forward DHCP Welcome to our tech lab! Dive into practical networking configurations and tutorials with us. To manage these DHCP servers in a unified manner, run the dhcp server group command to create a DHCP server group. A DHCP message is forwarded between a DHCP client and a DHCP server at most 16 times, and then the DHCP message is discarded. If the DHCP server's IP address is not specified 应用场景. RouterA的配置文件 # sysname RouterA # vlan batch 100 200 # dhcp enable # interface Vlanif100 ip address 10. Checking whether the DHCP relay agent is correctly configured. Switch configuration file # sysname Switch # vlan batch 10 to 11 # dhcp enable # dhcp server database enable # interface Vlanif10 ip address 10. Create DHCP pool [HUAWEI] ip pool DHCP-POOL Info: It is successful to create an IP address pool. 1 30. If the dhcp option82 append vendor-specific command has been run, whether the Sub9 of the old format can be inserted depends on the Option 82 insertion method (which is configured using the dhcp option82 enable command). The DHCP relay uses port 67 as both the source and destination ports to communicate with the DHCP server. 2 Gateway address in use : 10. After DHCP relay is enabled, run the dhcp relay binding server group or dhcp relay binding server ip commands on the interface to configure an IP address for the DHCP server, so that DHCP messages can be forwarded. The dhcp select relay command applies to DHCP relay agents. [VTEP2] interface LoopBack 2 [VTEP2-LoopBack2] ip binding vpn-instance vpn1 [VTEP2-LoopBack2] ip address 10. The DHCP client can dynamically request the configuration data and the DHCP server can provide the data for the client. The IP address of the gateway interface must be on the same network segment as the address pool configured on the DHCP server; otherwise, DHCP clients cannot obtain IP addresses. 0 # interface Ethernet2/0/0 port link-type trunk port trunk allow-pass vlan 200 # interface Ethernet2/0/11 port link-type access port default The preceding issues affect the methods in which a DHCP relay agent processes DHCP ACK and DHCP Request messages, so that the DHCP client fails to obtain an IP address. Configure strategies for processing Option 82 information on the DHCP relay agent. 1 ``` -为Subnet A和Subnet B创建DHCP中继接口，并将它们分配到相应的VLAN： ``` [Huawei] interface Vlanif10 [Huawei-Vlanif10] ip address 应用场景. The DHCP server sends DHCPOFFER and DHCPACK messages in unicast mode to the DHCP relay. Generally, a DHCP relay agent serves multiple DHCP servers. 此命令应用于DHCP中继。通常情况下，一台DHCP中继会同时代理多台DHCP服务器，此时可使用 dhcp relay server group 命令定义DHCP服务器组来统一管理该DHCP中继代理的DHCP服务器，从而在指定的DHCP服务器组中为通过DHCP中继接入的用户分配IP地址。 For DHCP L2 configuration, no other commands to configure on OLT. 0 # interface 10GE1/0/1 port default vlan 100 # interface 10GE1/0/2 Feb 1, 2021 · Overview This article is to assist with setting up OpenDNS on a Huawei HG8245H router. Group name of the DHCP Server. Run commit. If multiple DHCP relay agents exist on the network, run the dhcp relay detect enable command to enable user entry detection on the DHCP relay agent to prevent the IP addresses assigned to clients To ensure that a DHCP relay agent can forward DHCP packets to a DHCP server, run the dhcp relay server-select or dhcp relay server-ip command on the DHCP relay-enabled interface to configure the correct IP address of the DHCP server. If both of the two commands are run on a DHCP relay interface, the latest configuration overrides the previous one. support. An IPoE user obtains an IP address from the DHCP server over a DHCP relay agent and accesses the Layer 3 BAS interface of the BRAS through static routing. all addresses from 10. Planning DHCP Servers. 此命令应用于DHCP中继端。当DHCP中继设备的接口配置了主、从IP地址，使用 dhcp relay gateway-switch enable 命令使能中继网关自动切换后，当DHCP中继设备使用主IP地址作为网关为用户申请IP地址失败时，设备将自动转向使用从IP地址作为网关为用户申请IP地址。 If the DHCP relay agent is disabled from trusting Option 82 using the undo dhcp relay trust option82 command, the device discards the DHCP messages carrying Option 82. [PE1] display dhcp relay address interface Vbdif 1 ** Vbdif1 DHCP Relay Address ** Dhcp Option Relay Agent IP Server IP * 10. Usage Scenario. The server at 10. 1. [HUAWEI-VLANIF100] dhcp relay server-ip 192. 2 # interface Vlanif200 ip address 10. To configure an interval at which the DHCP relay agent stores user entries, run the dhcp relay unnumbered table write-delay interval-value command. 0. In this case, no DHCP relay agent is needed. 16. Dec 3, 2023 · If the DHCP is not in the same network, then the DHCP Discover and Request must be forwarded via DHCP Relay (Cisco calls it IP-Helper). 但在现网中可能会出现其他厂商设备不支持DHCP Option82的情况，所以需要支持修改DHCP报文源地址和giaddr的这种方式，进而完成基站上线流程。DHCP报文的giaddr可以通过 ip relay giaddr 命令配置，报文源地址则可以通过 dhcp relay source-ip-address 命令配置。 Table 1 Description of the display dhcp relay configuration command output; Item. 20. If a relay interface uses an unnumbered IP address, the DHCP relay agent performs the following operations to ensure DHCP message forwarding: The DHCP relay agent generates a user table for the users who go online from the relay interface and saves information, such as users' MAC addresses, online interface, and belonging VLAN. 0 # interface 10GE1/0/1 port default vlan 100 # interface 10GE1/0/2 port The DHCP server then uses the relay agent address to identify the network segment where a user resides and allocates an appropriate IP address for the user to allow for communication with the DHCP relay. 如果DHCP Client可以通过DHCP Relay向DHCP Server申请地址，并正常上线，说明配置成功。 应用环境. For DHCP clients, the DHCP relay is the DHCP server; for the DHCP server, the DHCP relay is a DHCP client. This section provides an example for configuring IPoE access for static Layer 3 users. This method can be used when the DHCP relay agent serves multiple DHCP servers and many devices need to be configured with Auto-Config on a large network. 0 dhcp select relay dhcp relay server-ip 10. You can perform the following steps to change the methods in which a DHCP relay agent processes DHCP ACK and DHCP Request messages to ensure that DHCP clients can obtain IP The dhcp enable command is the prerequisite for configuring DHCP-related functions, including DHCP relay, DHCP snooping, and DHCP server. Enables the DHCP relay function. Therefore, the DHCP ACK messages received by the DHCP relay agent are valid, and the DHCP snooping binding entries generated by the DHCP relay agent are 配置文件. < Huawei > system-view [Huawei] dhcp enable [Huawei] vlan 10 [Huawei-vlan10] quit [Huawei] interface vlanif 10 [Huawei-Vlanif10] dhcp select relay [Huawei-Vlanif10] dhcp relay source-ip 10. The switch is configured to trust Option 82. These two commands are mutually exclusive. To enable the DHCP relay agent to store user entries, run the dhcp relay unnumbered table autosave command. 1 2 Mar 13, 2025 · [Huawei-vlanif30] dhcp relay server-select dhcp-group 此时vlan30接口下的主机可以正常使用dhcp获取ip地址了。 两种方式均能达到同样的配置要求，在接口下直接指定DHCP服务器IP地址的方式较简单。 No interface address pool can be configured on the interface that connects the DHCP server and relay agent. Run: dhcp select relay The DHCP relay function is enabled on the interface. Jan 25, 2013 · When PCs are in a different subnet than a DHCP server installed, DHCP Relay Agent can be used to forward DHCP requests from PCs to DHCP server. Corporativo Acerca de Huawei The dhcp relay server-ip command configures a DHCP server address on an interface enabled with DHCP relay. As shown in Figure 2-24, an enterprise uses a DHCP server to assign IP addresses to servers in the data center. The original manual for this router can be found Oct 26, 2023 · 配置DHCP中继： -创建一个DHCP服务器组，并将LAN中的DHCP服务器添加到该组中： ``` [Huawei] dhcp server-group test [Huawei-dhcp-server-group-test] dhcp server 192. Nov 5, 2019 · 二、查看dhcp relay ip. 当dhcp客户端和dhcp服务器之间存在多个dhcp中继时，此命令仅用于和dhcp服务器相连的第一个dhcp中继，才能生效。 使用实例 # 向IP地址为10. 1 If the DHCP relay agent is disabled from trusting Option 82 using the undo dhcp relay trust option82 command, the device discards the DHCP messages carrying Option 82. This document provides campus networks typical configuration examples and feature typical configuration examples. Configure the DHCP relay agent to insert the Option 82 field to DHCP messages in a VLAN view. If multiple DHCP relay agents exist on the network, run the dhcp relay detect enable command to enable user entry detection on the DHCP relay agent to prevent the IP addresses assigned to clients If the DHCP relay agent is disabled from trusting Option 82 using the undo dhcp relay trust option82 command, the device discards the DHCP messages carrying Option 82. # 在RouterA上使用 display dhcp relay 命令用来查看接口的DHCP中继配置情况。 [RouterA] display dhcp relay interface vlanif 100 ** Vlanif100 DHCP Relay Configuration ** DHCP server group name : dhcpgroup1 DHCP server IP [0] :10. The configuration of the DHCP relay or IP helper is very simple. dhcp relay是指dhcp 中继代理，正常网络情况下，dhcp无法跨vlan、跨网络工作，如需在不同vlan中使用同一台dhcp服务器，则需要设置dhcp relay。 二、查看dhcp relay ip. Return to the system view. 2. 缺省情况下，DHCP中继 收到DHCP请求报文时，会使用接口 的IP地址重新 封装该报文的源IP地址。 执行 dhcp relay source-ip ip-address 命令，就可以指定DHCP中继所重新封装的DHCP报文源IP地址。 前置条件. 仅当dhcp中继设备向多个DHCP服务器转发报文时才需要配置。当配置多个DHCP服务器后，DHCP中继默认向所有服务器转发DHCP discover报文，会加重中继设备负担。 To enable the DHCP server to send a reply message that contains an enterprise code (option125), run the dhcp option125 command to configure the contents to be encapsulated in DHCP Option 125. Relay Address. 此命令应用于DHCP中继。当客户端的DHCP请求通过DHCP中继发送到跨网段的DHCP服务器时，可在中继设备上执行 dhcp relay binding server ip 命令配置DHCP中继代理的DHCP服务器的IP地址。 The dhcp select global command applies to DHCP servers. To address this issue, you can enable user entry detection on the DHCP relay agent. Proxy mode. Server group name. After the undo dhcp enable command is run, all DHCP-related configurations of the device are deleted. 0 # interface 10GE1/0/1 port default vlan 100 # interface 10GE1/0/2 Файл конфигурации SwitchA # sysname SwitchA # vlan batch 100 200 # dhcp enable # dhcp relay server group dhcpgroup1 server 10. You have also to make some configuration on DHCP server, like rental period, update cycle and address allocation pool. [AC6605] interface Vlanif 10 [AC6605-vlanif10] display this # interface Vlanif10 ip address 192. In this lab session, I will guide you through configuring DHCP r Networking Requirements. 102. 0 dhcp select interface dhcp server gateway-list 10. The dhcp relay gateway-switch enable command is used on DHCP relay agents. 3. The dhcp relay server-select command applies to DHCP relay agents. This document describes all the configuration commands of the device, including the command function, syntax, parameters, views, default level, usage guidelines, examples, and related commands. 如图17-9所示，DHCP Client通过VLAN 10接入 Device A设备。 要求在设备的二层接口GE 1/0/0 和GE 1/0/1 上配置DHCP Snooping功能。 把DHCP Client侧的接口配置为untrusted模式，把DHCP Relay侧的接口配置为trusted模式。 This document describes the configurations of IP Service, including IP address, ARP, DHCP, DHCP policy VLAN, DNS, mDNS gateway, mDNS relay, UDP Helper, IP performance optimization, IPv6, DHCPv6, IPv6 DNS, IPv6 over IPv4 tunnel, and IPv4 over IPv6 tunnel. In some situations, such as to log out a user, the DHCP relay agent sends a Request message to a specified DHCP server for releasing the IP address assigned to a DHCP client. The DHCP server sends requested configurations to the client through the DHCP relay agent based on information in the Request message. The DHCP relay function is enabled on the interface. 设置dhcp relay需要dhcp dhcp select relay. Intermediate file server: stores the intermediate file required by the device to be deployed Oct 27, 2022 · In this video, I want to share the knowledge of DHCP (Dynamic Host Configuration Protocol). The undo dhcp relay server-ip command deletes the configured DHCP server addresses on an interface enabled with DHCP relay. 2 . After the DHCP server receives the Request message, it releases the specified IP address lease. After receiving the message, the DHCP server sets the status of the IP Run dhcp relay server-ip ip-address. huawei. As we know Dynamic Host Configuration Protocol (DHCP) works in the client/server mode. When a DHCP client needs to send DHCP requests to a DHCP server using a DHCP relay agent, you can run the dhcp relay server-select command to specify a DHCP server group for the DHCP relay agent and configure the DHCP server address. Run the dhcp select global command to configure the device to assign IP addresses from the global address pool. By default, Option 82 is enabled on the DHCP relay agent. The configuration is committed. 执行本命令前，需要在接口下执行 dhcp select relay 命令，启动接口的DHCP This command applies to DHCP relay agents. If a DHCP server is specified, the DHCP relay agent sends a DHCP Release message only to the specified DHCP server. iup cdauw tnzf apx deb fxfw asdnwd zgj ocjabahc net