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

S7700 and S9700 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.
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 an Interface as a Trusted Interface

Configuring an Interface as a Trusted Interface

Context

To enable DHCP clients to obtain IP addresses only from authorized DHCP servers, configure the interfaces (if0, in Figure 9-11) directly or indirectly connected to the DHCP servers trusted by the administrator as the trusted interfaces, and other interfaces (if2, in Figure 9-11) as untrusted interfaces. This prevents bogus DHCP servers from assigning IP addresses to DHCP clients.

After enabling DHCP snooping on the interface or in the VLAN connected to the user, configure the interface connected to the DHCP server as the trusted interface, so that the dynamic DHCP snooping binding table is generated.

Figure 9-11  DHCP snooping networking diagram

Perform the following steps on the Layer 2 access device.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Configure the interface as the trusted interface in the interface view or VLAN view.

    • In the interface view:

    1. Run interface interface-type interface-number

      The interface view is displayed.

    2. Run dhcp snooping trusted

      The interface is configured as the trusted interface.

      By default, an interface is an untrusted interface.

    • In the VLAN view:

    1. Run vlan vlan-id

      The VLAN view is displayed.

    2. Run dhcp snooping trusted interface interface-type interface-number

      The interface is configured as the trusted interface.

      By default, an interface is an untrusted interface.

    If you run this command in the VLAN view, the command takes effect only on DHCP messages in this VLAN received from interfaces that belong to this VLAN. If you run the dhcp snooping trusted command in the interface view, the command takes effect for all the DHCP messages received on the specified interface.

Translation
Download
Updated: 2019-04-01

Document ID: EDOC1000178319

Views: 135978

Downloads: 78

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