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Configuration Guide - IP Service

CloudEngine 8800, 7800, 6800, and 5800 V200R002C50

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DNS, IP performance optimization, IPv6, DHCPv6, and IPv6 DNS.
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Licensing Requirements and Limitations for DHCP

Licensing Requirements and Limitations for DHCP

Involved Network Elements

Other network elements are not required.

Licensing Requirements

DHCP is a basic feature of a switch and is not under license control.

Version Requirements

Table 3-7  Products and minimum version supporting DHCP

Product

Minimum Version Required

CE8850-32CQ-EI V200R002C50
CE8850-64CQ-EI V200R005C00
CE8860EI V100R006C00
CE8861EI V200R005C10
CE8868EI V200R005C10
CE7850EI V100R003C00
CE7855EI V200R001C00
CE6810EI V100R003C00
CE6850EI V100R001C00
CE6850-48S6Q-HI V100R005C00
CE6850-48T6Q-HI/CE6850U-HI/CE6851HI V100R005C10
CE6855HI V200R001C00
CE6856HI V200R002C50
CE6857EI V200R005C10
CE6860EI V200R002C50
CE6865EI V200R005C00
CE6870-24S6CQ-EI/CE6870-48S6CQ-EI V200R001C00
CE6870-48T6CQ-EI V200R002C50
CE6875-48S4CQ-EI V200R003C00
CE6880EI V200R002C50
CE5810EI V100R002C00
CE5850EI V100R001C00
CE5850HI V100R003C00
CE5855EI V100R005C10
CE5880EI V200R005C10

Feature Limitations

When deploying DHCP on a switch, pay attention to the following points:
  • The CE6810LI does not support IPv4 Layer 3 forwarding. After the IPv4 function is enabled on an interface of the CE6810LI, the configured IPv4 address can only be used to manage the switch.

  • In V200R002C50 and later versions, a switch as a DHCP server can allocate IP addresses on the same network segment as the secondary IP address of an interface. When the address pool corresponding to the primary IP address has no available IP addresses, the switch searches the address pools corresponding to secondary IP addresses for available IP addresses, starting from lower IP addresses.

  • In V200R005C00 and later versions, a DHCP server assigns IP addresses to DHCP clients with the same MAC address in different VLANs.
  • When configuring the range of dynamically assignable IP addresses in the global address pool, ensure that the range is the same as the network segment on which the DHCP server interface address or the DHCP relay agent interface address resides. This avoids incorrect assignment of IP addresses.

  • The maximum number of times that a DHCP message is forwarded through DHCP relay agents between a DHCP client and a DHCP server cannot be greater than 16; otherwise, the message is discarded.

  • In a VXLAN scenario, DHCP relay and DHCP snooping cannot be configured together on the same network-side interface.

  • When configuring the DHCP server function on an M-LAG, you must configure the function on both member switches in the M-LAG, and IP addresses in the address pools on the two switches cannot overlap.

  • When configuring the DHCP relay function on an M-LAG, you must configure the function on both member switches in the M-LAG.

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Updated: 2019-03-21

Document ID: EDOC1000166635

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