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Configuration Guide - Security

S9300, S9300E, and S9300X V200R011C10

This document describes the configurations of Security, including ACL, reflective ACL, local attack defense, MFF, attack defense, traffic suppression and storm control, ARP security, port security, DHCP snooping, ND snooping, PPPoE+, IPSG, SAVI, URPF, keychain, separating the management plane from the service plane, security risks.
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Configuring Interface-based ARP Entry Limiting

Configuring Interface-based ARP Entry Limiting

Context

To prevent ARP entries from being exhausted by ARP attacks from a host connecting to an interface on the device, set the maximum number of ARP entries that the interface can dynamically learn. When the number of ARP entries learned by a specified interface reaches the maximum number, the interface cannot dynamically learn new ARP entries.

Perform the following steps on the gateway.

Procedure

  • Configuring ARP entry limiting on a Layer 2 interface
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. Run arp-limit vlan vlan-id1 [ to vlan-id2 ] maximum maximum

      ARP entry limit on the Layer 2 interface is configured.

      By default, the maximum number of ARP entries that an interface can dynamically learn is the same as the number of ARP entries supported by the device.

  • Configuring ARP entry limiting on a Layer 3 interface or sub-interface
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number [.subinterface-number ]

      The interface view or sub-interface view is displayed.

    3. (Optional) On an Ethernet interface, run undo portswitch

      The interface is switched to Layer 3 mode.

      By default, an Ethernet interface works in Layer 2 mode.

    4. Run arp-limit maximum maximum

      ARP entry limit on a Layer 3 interface or sub-interface interface is configured.

      By default, the maximum number of ARP entries that an interface can dynamically learn is the same as the number of ARP entries supported by the device.

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Updated: 2019-04-01

Document ID: EDOC1000178410

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