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MAC
Operation Manual –
Quidway S3100 Series Ethernet Switches
Chapter 1 MAC Address Table Management
Note:
This chapter describes the management of static, dynamic, and blackhole MAC
address entries. For information about the management of multicast MAC address
entries, refer to the IGMP Snooping-related section in Quidway S3100 Series Ethernet
Switches Operation Manual.
1.1 Overview
1.1.1 Introduction to MAC Address Table
A MAC address table is a port-based Layer 2 address table. It is the base for Ethernet
switch to perform Layer 2 packet forwarding. Each entry in a MAC address table
contains the following fields:
Destination MAC address.
ID of the VLAN which a port belongs to.
Forwarding port number.
Upon receiving a packet, a switch queries its MAC address table for the forwarding port
number according to the destination MAC address carried in the packet and then
forwards the packet through the port.
1.1.2 Entries in a MAC Address Table
Entries in a MAC address table fall into the following categories according to their
characteristics and configuration methods:
Static MAC address entry: Also known as permanent MAC address entry. This
type of MAC address entries are added/removed manually and can not age out by
themselves. Using static MAC address entries can reduce broadcast packets
remarkably and are suitable for networks where network devices seldom change.
Dynamic MAC address entry: MAC address entries of this type age when the
customized aging time expires. They are created through the MAC address
learning mechanism. You can also add dynamic MAC address entries manually.
Blackhole MAC address entry: This type of MAC address entries are configured
manually. A switch discards the packets destined for the MAC addresses
contained in blackhole MAC address entries.
Forwarding Table
Address
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Chapter 1 MAC Address Table Management
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