Edge-Core ES4308-PoE Management Manual page 12

Introduction
passing through the port is restricted. If broadcast traffic rises above a pre-defined
threshold, it will be throttled until the level falls back beneath the threshold.
Static Addresses – A static address can be assigned to a specific interface on this
switch. Static addresses are bound to the assigned interface and will not be moved.
When a static address is seen on another interface, the address will be ignored and
will not be written to the address table. Static addresses can be used to provide
network security by restricting access for a known host to a specific port.
IEEE 802.1D Bridge – The switch supports IEEE 802.1D transparent bridging. The
address table facilitates data switching by learning addresses, and then filtering or
forwarding traffic based on this information. The address table supports up to 8K
addresses.
Store-and-Forward Switching – The switch copies each frame into its memory
before forwarding them to another port. This ensures that all frames are a standard
Ethernet size and have been verified for accuracy with the cyclic redundancy check
(CRC). This prevents bad frames from entering the network and wasting bandwidth.
To avoid dropping frames on congested ports, the switch provides 400 KB for frame
buffering. This buffer can queue packets awaiting transmission on congested
networks.
Virtual LANs – The switch supports up to 64 VLANs. A Virtual LAN is a collection of
network nodes that share the same collision domain regardless of their physical
location or connection point in the network. The switch supports tagged VLANs
based on the IEEE 802.1Q standard. Ports can be manually assigned to a specific
set of VLANs. This allows the switch to restrict traffic to the VLAN groups to which a
user has been assigned. By segmenting your network into VLANs, you can:
• Eliminate broadcast storms which severely degrade performance in a flat network.
• Simplify network management for node changes/moves by remotely configuring
VLAN membership for any port, rather than having to manually change the
network connection.
• Provide data security by restricting all traffic to the originating VLAN.
Power-over-Ethernet (PoE) – The switch's eight RJ-45 ports support the IEEE
802.3af PoE standard that enables DC power to be supplied to attached devices
over wire pairs in the connecting Ethernet cable. Any 802.3af compliant device
attached to a port can directly draw power from the switch over the Ethernet cable
without requiring its own separate power source. This capability gives network
administrators centralized power control for devices such as IP phones and wireless
access points, which translates into greater network availability.
A maximum PoE power budget for the switch (power available to all switch ports) is
defined so that power can be centrally managed, preventing overload conditions at
the power source. If the power demand from devices connected to the switch
exceeds the power budget, the switch uses port power priority settings to limit the
supplied power.
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