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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.
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Service Is Interrupted After IPSG Is Enabled on the Upstream Interface

Service Is Interrupted After IPSG Is Enabled on the Upstream Interface

Fault Description

After IPSG is enabled on an interface, all hosts on the interface cannot access the Internet. Service on the hosts is abnormal.


  1. Check whether IPSG has been enabled on an upstream interface.

    Generally, IPSG is enabled on the user-side (downstream) interface. If IPSG is enabled on the upstream interface, the packets returned by the gateway may be discarded. As a result, user service is interrupted.

    In Figure 12-18, after static binding entries are configured on the switch for Host_1 and Host_2 and IPSG is enabled on IF1, IF2, and IF3, the hosts cannot access the Internet. However, the hosts can communicate with each other. Host_1 is used as an example here to describe the fault symptom:
    • Host_1 sends a packet to the Internet. When the packet reaches IF1 of the switch, the switch detects that the packet matches a binding entry, and forwards it.
    • A packet is sent from the Internet to Host_1. When the packet reaches IF3, the switch detects that the packet does not match any binding entry, and discards the packet.
    Figure 12-18  Service is interrupted after IPSG is enabled on the upstream interface

  2. Perform the following operations:
    1. Run the display ip source check user-bind interface interface-type interface-number command to check whether IPSG is enabled on the upstream interface IF3.
    2. If "ip source check user-bind enable" is displayed, IPSG has been enabled on the upstream interface. Run the undo ip source check user-bind enable command in the interface view to disable IPSG on upstream interface IF3.
Updated: 2019-04-01

Document ID: EDOC1000178319

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