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Configuration Guide - Security

S1720, S2700, S5700, and S6720 V200R011C10

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, URPF, keychain, MPAC, separating the management plane from the service plane, security risks, PKI.
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IPSG Deployment

IPSG Deployment

Generally, IPSG is configured on the interfaces or VLANs of the access device connected to users.
  • In Figure 12-4, after IPSG is enabled on the user-side interface of the switch, the switch performs an IPSG check on all IP packets received by this interface.
    Figure 12-4  IPSG is enabled on an interface

  • In Figure 12-5, after IPSG is enabled on the user-side VLAN, the switch performs an IPSG check on the IP packets received by all interfaces in this VLAN.
    Figure 12-5  IPSG is enabled in a VLAN

If the access device directly connected to users does not support IPSG, IPSG can be configured on the aggregation or core device, as shown in Figure 12-6.

  • For example, Switch_1 connected to intranet 1 does not support IPSG, so IPSG is configured on IF1 of Switch_2 (a binding table needs to be built on Switch_2 for the hosts in intranet 1). Switch_1 does not support IPSG, so the packets from Switch_1 may be IP address spoofing packets. IPSG configured on IF1 of Switch_2 can block the attack and minimize the attack scope.
  • IPSG also needs to be configured on IF2 of Switch_2, which is connected to intranet 2; otherwise, intranet 2 is prone to IP address spoofing attacks.
Figure 12-6  Multi-switch environment

Updated: 2019-09-23

Document ID: EDOC1000178177

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