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Configuration Guide - Security

S9300, S9300E, and S9300X 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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Application Scenarios for Port Security

Application Scenarios for Port Security

Port security usually applies to the following scenarios:

  • The access device configured with port security can defend against attacks initiated by an unauthorized user using another interface.
  • The aggregation device configured with port security can limit the number of access users.

Configuring Port Security at the Access Layer

As shown in Figure 8-1, PC1 and PC3 connect to SwitchA using IP phones, and PC2 directly connects to SwitchA. To ensure access device security and defend against attacks from unauthorized users, configure port security on the interface of SwitchA.

Figure 8-1  Configuring port security at the access layer
  • If access users frequently change the locations, you can configure port security to convert dynamic MAC addresses into dynamic secure MAC addresses. This function ensures that bound MAC address entries are deleted immediately when users change the locations.
  • If access users seldom change the locations, you can configure port security to convert dynamic MAC addresses into sticky MAC addresses. This function ensures that bound MAC address entries will not be lost after a device restart.
  • If there are a few access users who seldom change the locations, you can configure static secure MAC addresses.

Configuring Port Security at the Aggregation Layer

As shown in Figure 8-2, multiple PCs communicate with the switch through SwitchA on a tree network. To ensure aggregation device security and limit the number of access users, configure port security on the aggregation device and set the maximum number of secure MAC addresses.

Figure 8-2  Configuring port security at the aggregation layer
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Updated: 2019-04-01

Document ID: EDOC1000178410

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