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Configuration Guide - IP Service

S7700 and S9700 V200R013C00

This document describes the configurations of IP service, including IP address, ARP, DHCP, DNS, mDNS gateway, mDNS relay, UDP Helper, IP performance optimization, IPv6, DHCPv6, IPv6 DNS, IPv6 over IPv4 tunnel and IPv4 over IPv6 tunnel.

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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 2-4  Products and versions supporting ARP

Product

Product Model

Software Version

S7700

S7703, S7706, and S7712

V100R003C01, V100R006C00, V200R001(C00&C01), V200R002C00, V200R003C00, V200R005C00, V200R006C00, V200R007C00, V200R008C00, V200R009C00, V200R010C00, V200R011C10, V200R012C00, V200R013C00

S7703 PoE

V200R013C00

S7706 PoE

V200R013C00

S9700

S9703, S9706, and S9712

V200R001(C00&C01), V200R002C00, V200R003C00, V200R005C00, V200R006C00, V200R007(C00&C10), V200R008C00, V200R009C00, V200R010C00, V200R011C10, V200R012C00, V200R013C00

NOTE:
For details about software mappings, visit Hardware Query Tool and search for the desired product model.

Feature Limitations

  • Proxy ARP does not take effect for gratuitous ARP packets.

  • Intra-VLAN proxy ARP and inter-VLAN proxy ARP determine whether VLAN information meets proxy requirements based on ARP entries matching source and destination IP addresses of packets. If no ARP entry matches the destination IP address of a packet, the switch broadcasts an ARP request in the VLAN (for intra-VLAN proxy ARP) or all sub-VLANs of the super-VLAN (for inter-VLAN proxy ARP) to learn the APR entry matching the destination IP address. When multiple switches on a network have proxy ARP enabled and a requested destination IP address does not exist, this ARP broadcast packet triggers the same proxy process on other switches. This cyclic proxy process will cause a broadcast storm.

  • CPCAR limits the rate of protocol packets of different services sent to the control plane, ensuring security of the control plane. A switch can set the default CPCAR values for the packets of each protocol. The CPCAR values of some protocol packets need to be adjusted based on the actual service scale and user network. If the CPCAR values are adjusted improperly, network services are affected. To adjust the CPCAR values of ARP Request and Reply packets, contact Huawei technical support engineers.

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Updated: 2019-04-20

Document ID: EDOC1100065743

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