Basic System Configuration & Debugging
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28.4 Device Management
The device management function of the Ethernet switch can report the current status and
event-debugging information of the boards to you. Through this function, you can maintain
and manage your physical device, and restart the system when some functions of the system
are abnormal.
28.4.1 Device Management Configuration
Table 28-6 Device management configuration tasks
Operation
Description
Related section
MAC address Table
management
Reboot switch
28.4.2 MAC address Table management
28.4.2.1 Overview
Introduction to MAC Address Learning
An Ethernet switch maintains a MAC address table to forward packets quickly.A MAC
address table is a port-based Layer 2 address table. It is the base forEthernet switch to
perform Layer 2 packet forwarding. Each entry in a MAC
adress 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.
The dynamic address entries (not configured manually) in the MAC address table are
learned by the Ethernet switch. When an Ethernet switch learns a MAC address, the following
occurs:
When a switch receives a packet from one of its ports (referred to as Port 1,the switch
extracts the source MAC address (referred to as MAC-SOURCE) of the packet and considers
that the packets destined for MAC-SOURCE can be forwarded through Port 1.
If the MAC address table already contains MAC-SOURCE, the switch updates the
corresponding MAC address entry.
If MAC-SOURCE does not exist in the MAC address table, the switch adds
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