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S12700 V200R012C00 Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, VLAN aggregation, MUX VLAN, VLAN termination, 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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Elements and Functions of a MAC Address Table

Elements and Functions of a MAC Address Table

Elements

A MAC address table contains entries that are identified by a MAC address and a VLAN ID or VSI name. Each entry specifies the outbound interface through which packets with the specified destination MAC address and VLAN ID or VSI are forwarded. If a destination host joins multiple VLANs or VSI names, the host's MAC address corresponds to multiple VLAN IDs or VSI names. Table 2-2 provides an example of this scenario. In this case, packets with destination MAC address 0011-0022-0034 and VLAN 10 are forwarded through outbound interface GE3/0/1, whereas packets with the same destination MAC address but VLAN 20 are forwarded through outbound interface GE2/0/4.

Table 2-2  MAC address entries

MAC Address

VLAN ID/VSI Name

Outbound Interface

0011-0022-0034

10

GE3/0/1

0011-0022-0034

20

GE2/0/4

0011-0022-0035

30

Eth-Trunk20

0011-0022-0035

huawei

GE2/0/5

Functions

A MAC address table is used for unicast forwarding of packets. In Figure 2-1, when packets sent from PC1 to PC3 reach the switch, the switch searches its MAC address table for the destination MAC address MAC3 and VLAN 10 in the packets to obtain outbound interface Port3. The switch then forwards packets to PC3 through Port3.

Figure 2-1  Forwarding based on the MAC address table
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Updated: 2019-01-18

Document ID: EDOC1100038103

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