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Advanced
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Device Management
This section helps you enhance the switchs traffic forwarding capacity and manage the
switch efficiently. The following five parts are included:
MAC: Manage this switchs MAC address forwarding table.
STP: Eliminate physical loop in data link layer, avoid broadcast storm and provide link
backup redundancy.
IGSP: Manage and control multicast groups to save network bandwidth, to ensure better
multicast security and to make each hosts separate billing convenient.
SNMP: Manage the switch efficiently.
DHCP Snooping: Protect the DHCP server in local area network, prevent the DHCP
server from being cheated and keep DHCP addresses from being used up.
1 MAC
The switch forwards frames in data link layer. In this process, by learning source MAC
addresses of these frames, the switch will create the MAC address forwarding table, MAC
address, VLAN ID (if there is), port number included.
When forwarding a frame, the device adopts the following forwarding modes based on the
MAC address table:
Unicast mode: If an entry is available for the destination MAC address, the device will
forward the frame to the outgoing port indicated by the MAC address table entry.
Broadcast mode: If the device receives a frame with the destination address whose
lowest bit of the second byte is 1, or no entry is available for the destination MAC
address, the device forwards the frame to all ports except the receiving port, i.e.
broadcast packets, multicast packets and unknown unicast packets will be forwarded.
MAC Forwarding Table Aging Scheme
To adapt to network changes and prevent inactive entries from occupying limited table
space, an aging mechanism is adopted for dynamic MAC address entries. This aging
mechanism ensures that the MAC address table can quickly update to accommodate the
latest network changes.
Each time a dynamic MAC address entry is obtained or created, an aging timer starts (To
configure MAC age, click Administration > System Configuration > System info). If the
entry has not updated when the aging timer expires, the device deletes the entry.
Types of MAC address table entries
In terms of configuration method and respective features, MAC address table entries can
be divided into two categories:
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