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Configuration Guide - Ethernet Switching

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, MUX VLAN, Voice VLAN, VLAN mapping, QinQ, GVRP, VCMP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, and Layer 2 protocol transparent transmission.
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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 other devices' MAC addresses 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 the MAC address table. If a MAC address entry matches the destination MAC address, the switch forwards the packet from the corresponding outbound interface in the MAC address entry. If no MAC address entry matches the destination MAC address, the switch broadcasts the packet to all interfaces in the corresponding VLAN, except the inbound interface receiving the packet.

Classification of MAC Address Entries

MAC address entries are classified into 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 service modules 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 source MAC addresses of packets on 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 dynamic MAC address entries.
  • You can obtain the number of communicating users connected to 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 this 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 device discards packets from or destined for the blackhole MAC addresses.

Blackhole MAC address entries can filter out unauthorized users.

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Updated: 2019-05-08

Document ID: EDOC1100004351

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