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Configuration Guide - IP Service

CloudEngine 12800 and 12800E V200R005C00

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 ARP

Licensing Requirements and Limitations for ARP

Involved Network Elements

Other network elements are not required.

Licensing Requirements

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

Version Requirements

Table 2-3 Products and minimum version supporting ARP

Product Model

Minimum Version Required

CE12804/CE12808/CE12812

V100R001C00

CE12816

V100R003C00

CE12804S/CE12808S

V100R005C00

CE12800E

V200R002C50

Feature Limitations

  • When configuring dynamic ARP on the switch, pay attention to the following points:

    If the value of the aging time is set too small (for example, 1 minute), the system consumes most resources on updating dynamic ARP entries, affecting the processing of other services.

  • When configuring Layer 2 proxy ARP on the switch, pay attention to the following points:

    When Layer 2 proxy ARP is enabled, ARP snooping is automatically enabled and sets up ARP snooping entries recording senders' information by means of monitoring ARP messages. When most network users obtain IP addresses using DHCP, to avoid proxy reply errors from fake ARP snooping entries generated by the bogus ARP messages that network attackers send, disable the learning function in the VLAN view of ARP snooping entries.

  • When configuring egress ARP inspection (EAI) on the switch, pay attention to the following points:
    • After EAI is enabled, the switch sends all the received ARP Request packets to the CPU for software forwarding, which degrades the ARP packet forwarding performance.

    • EAI and MAC-forced forwarding (MFF) cannot be configured in the same VLAN because the two functions use mutually exclusive ARP mechanisms. MFF uses the proxy ARP mechanism, whereas EAI forwards ARP Request packets.

    • EAI cannot be configured in the super-VLAN.

    • When both EAI and transparent transmission of Layer 2 protocol packets are configured, EAI takes effect preferentially.

  • When both proxy ARP anyway and port-based automatic local ARP attack defense are configured on a device, only the proxy ARP anyway function takes effect.
  • Assume that the system software is upgraded from V100R002C00 to V100R003C00 or a later version. If the system resource large-arp-table command has been configured in any VS before the upgrade, the command format changes to arp resource-mode local after the upgrade and the command function remains unchanged. If the system resource { standard | user-defined } command has been configured before the upgrade, the command format changes to arp resource-mode global after the upgrade and the command function remains unchanged. If the save command is not run after the upgrade, the system software can be smoothly rolled back to V100R002C00. If the save command is run, the system resource configuration will be lost and cannot be successfully rolled back. After the system software is rolled back to V100R002C00, the system resource mode is standard.
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Updated: 2019-04-18

Document ID: EDOC1100039535

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