No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

Configuration Guide - Security

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of Security, including ACL, local attack defense, MFF, attack defense, traffic suppression and storm control, ARP security, Port security, DHCP snooping, ND snooping, PPPoE+, IPSG, SAVI, separating the management plane from the service plane, security risks.
Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Configuring Interface-based ARP Entry Limit

Configuring Interface-based ARP Entry Limit

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 limit 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

      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.

    4. Run commit

      The configuration is committed.

  • Configuring ARP entry limit on a Layer 3 interface
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. 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.

      The mode switching function takes effect when the interface only has attribute configurations (for example, shutdown and description configurations). Alternatively, if configuration information supported by both Layer 2 and Layer 3 interfaces exists (for example, mode lacp and lacp system-id configurations), no configuration that is not supported after the working mode of the interface is switched can exist. If unsupported configurations exist on the interface, delete the configurations first and then run the undo portswitch command.

      NOTE:

      If many Ethernet interfaces need to be switched to Layer 3 mode, run the undo portswitch batch interface-type { interface-number1 [ to interface-number2 ] } &<1-10> command in the system view to switch these interfaces to Layer 3 mode in batches.

    4. Run arp limit maximum

      ARP entry limit on the Layer 3 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.

    5. Run commit

      The configuration is committed.

Follow-up Procedure

After configuring ARP entry limit on a VBDIF interface, you can run the arp limit alarm-threshold threshold-value command on the interface to configure an alarm threshold. When the number of ARP entries learned by the VBDIF interface reaches the alarm threshold, the switch sends an alarm notifying the user of the need to delete excess dynamic ARP entries.

By default, the alarm threshold for ARP entry limit on a VBDIF interface is 80%.

NOTE:
The arp limit alarm-threshold command can be executed only on the CE5880EI, CE6850HI, CE6850U-HI, CE6851HI, CE6855HI, CE6856HI, CE6857EI, CE6860EI, CE6865EI, CE6870EI, CE6875EI, CE6880EI, CE7850EI, CE7855EI, CE8850EI, CE8861EI, CE8868EI, and CE8860EI.
Translation
Download
Updated: 2019-04-20

Document ID: EDOC1100074765

Views: 28525

Downloads: 97

Average rating:
This Document Applies to these Products
Related Documents
Related Version
Share
Previous Next