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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.
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Configuring Rate Limitation on User Traffic Based on DHCP Snooping Binding Tables

Configuring Rate Limitation on User Traffic Based on DHCP Snooping Binding Tables

Context

After users go online on a DHCP network, user traffic is not limited by default. In this case, if the traffic of a user is extremely high, the limited network resources are occupied by the user, affecting resource usage of other DHCP users.

To solve this problem, you can configure rate limitation on user traffic based on DHCP snooping binding tables. The device then will discard extra traffic so that the input and output traffic is restricted within a reasonable range. After a DHCP user goes online, the device identifies it as an authorized user based on the DHCP snooping binding table and dynamically applies the configured traffic rate limitation policy for the user. This ensures that network resources can be effectively used.

NOTE:
  • The configuration in the system view takes effect globally for DHCP users; the configuration in the VLAN view takes effect only for the DHCP users in the VLAN.
  • If rate limitation on user traffic is configured both in the system view or VLAN view for the same DHCP user, the configuration in the VLAN view takes effect.
  • CE6880EI and CE5880EI do not support the function.

Procedure

  • Configure global rate limitation on DHCP user traffic.
    1. Run system-view

      The system view is displayed.

    2. Run dhcp snooping users car cir cir-value [ cbs cbs-value ]

      Rate limitation on DHCP user traffic is configured.

    3. Run commit

      The configuration is committed.

  • Configure rate limitation on DHCP user traffic in a VLAN.
    1. Run system-view

      The system view is displayed.

    2. Run vlan vlan-id

      The VLAN view is displayed.

    3. Run dhcp snooping users car cir cir-value [ cbs cbs-value ]

      Rate limitation on DHCP user traffic is configured.

    4. Run commit

      The configuration is committed.

Verifying the Configuration

  • Run the display dhcp snooping users car status [ ip-address ip-address | mac-address mac-address | vlan vlan-id | interface interface-type interface-number ] * command to check configuration about rate limitation on DHCP user traffic.
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Updated: 2019-04-20

Document ID: EDOC1100074765

Views: 29395

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