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

S12700 V200R010C00 Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring link aggregation, VLANs, Voice VLAN, VLAN mapping, QinQ, GVRP, MAC table, STP/RSTP/MSTP, SEP, and so on.
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).
Definition and Classification of MAC Address Entries

Definition and Classification of MAC Address Entries

Definition of a MAC Address Table

A MAC address table records MAC addresses that have been learned by the switch, interfaces on which MAC addresses are learned, and VLANs that the interfaces belong to. Before forwarding a packet, the switch looks up the destination MAC address of the packet in the MAC address table. If a MAC address entry matches the destination MAC address, the switch forwards the packet from the outbound interface recorded in the MAC address entry. If no matching MAC address entry exists, the switch broadcasts the packet to all interfaces in the corresponding VLAN, except the interface that received the packet.

Classification of MAC Address Entries

MAC address entries are classified as dynamic, static, and blackhole entries. In addition, there are MAC address entries that are related to service types, for example, secure MAC, MUX MAC, authen MAC, and guest MAC. They are maintained by services and are converted from dynamic MAC address entries.

Table 2-1  Characteristics and functions of different MAC address entries

MAC Address Entry Type

Characteristics

Function

Dynamic MAC address entry

  • Dynamic MAC address entries are obtained by learning the source MAC addresses of packets received by an interface, and can be aged.
  • Dynamic MAC address entries are lost after a system restart, LPU hot swap, or LPU reset.
  • You can check whether data is forwarded between two connected devices by checking the dynamic MAC address entries.
  • You can obtain the number of users communicating on an interface by checking the number of specified dynamic MAC address entries.

Static MAC address entry

  • Static MAC address entries are manually configured and delivered to each LPU. Static MAC address entries never age.
  • The static MAC address entries saved in the system are not lost after a system restart, LPU hot swap, or LPU reset.
  • After an interface is statically bound to a MAC address, other interfaces discard packets from that source MAC address.
  • Each static MAC address entry can have only one outbound interface.
  • Statically binding an interface to a MAC address does not affect the learning of dynamic MAC address entries on the interface.

When static MAC address entries are configured, authorized users can use network resources and other users are prevented from using the bound MAC addresses to initiate attacks.

Blackhole MAC address entry

  • Blackhole MAC address entries are manually configured and delivered to each LPU. Blackhole MAC address entries never age.
  • The blackhole MAC address entries saved in the system are not lost after a system restart, LPU hot swap, or LPU reset.
  • After blackhole MAC address entries are configured, the switch discards packets from or destined for the blackhole MAC addresses.

Blackhole MAC address entries can filter out unauthorized users.

Translation
Download
Updated: 2019-08-21

Document ID: EDOC1000142081

Views: 260273

Downloads: 412

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