Ieee 802.1D Bridge; Store-And-Forward Switching; Spanning Tree Algorithm - Edge-Core ES4528V-38 Management Manual

| Introduction
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HAPTER
Description of Software Features
IEEE 802.1D B
RIDGE
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TORE AND ORWARD
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WITCHING
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PANNING REE
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LGORITHM
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.
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.
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 0.75 MB
for frame buffering. This buffer can queue packets awaiting transmission
on congested networks.
The switch supports these spanning tree protocols:
◆ Spanning Tree Protocol (STP, IEEE 802.1D) – Supported by using the
STP backward compatible mode provided by RSTP. STP provides loop
detection. When there are multiple physical paths between segments,
this protocol will choose a single path and disable all others to ensure
that only one route exists between any two stations on the network.
This prevents the creation of network loops. However, if the chosen
path should fail for any reason, an alternate path will be activated to
maintain the connection.
Rapid Spanning Tree Protocol (RSTP, IEEE 802.1w) – This protocol
◆
reduces the convergence time for network topology changes to about 3
to 5 seconds, compared to 30 seconds or more for the older IEEE
802.1D STP standard. It is intended as a complete replacement for STP,
but can still interoperate with switches running the older standard by
automatically reconfiguring ports to STP-compliant mode if they detect
STP protocol messages from attached devices.
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