ADC Campus-REX2 RS Manuale Utente
Chapter 8 - Internetworking and Management Overview
124
Campus-REX2 RS Interface Card User Manual
MAC-L
EVEL
B
RIDGING
AND
S
PANNING
T
REE
P
ROTOCOL
The following sections describe the MAC-level bridge and the Spanning Tree
algorithm function.
algorithm function.
About MAC-Level Bridging
A bridge moves information across an internetwork from a source to a
destination at the link layer (of an OSI reference model). The information is
sent to a physical address known as a Media Access Control (MAC) address.
destination at the link layer (of an OSI reference model). The information is
sent to a physical address known as a Media Access Control (MAC) address.
The Campus-REX2 provides transparent Ethernet MAC-level bridging. It is
a completely self-contained bridge with a CPU, memory subsystems (RAM,
Flash, etc.), an Ethernet controller and Ethernet drivers, and other glue logic.
It provides complete main bridging tasks of learning, forwarding, filtering,
and hashing/buffer management. Additionally, it offers 802.1d Spanning
Tree protocol, packet encapsulation (through cHDLC or PPP framing), and
other local tasks.
a completely self-contained bridge with a CPU, memory subsystems (RAM,
Flash, etc.), an Ethernet controller and Ethernet drivers, and other glue logic.
It provides complete main bridging tasks of learning, forwarding, filtering,
and hashing/buffer management. Additionally, it offers 802.1d Spanning
Tree protocol, packet encapsulation (through cHDLC or PPP framing), and
other local tasks.
About Spanning Tree Protocol
Spanning Tree protocol creates a logical topology to overlay a physical
network. This overlay disables all loops in the data path. Enabling Spanning
Tree ensures a unique, primary path from any node on a network to any other
node. Also, if the primary path is lost, Spanning Tree creates a new primary
path by enabling links in the physical network that were previously disabled
in creating the active topology. The following figure shows an example of
Spanning Tree.
network. This overlay disables all loops in the data path. Enabling Spanning
Tree ensures a unique, primary path from any node on a network to any other
node. Also, if the primary path is lost, Spanning Tree creates a new primary
path by enabling links in the physical network that were previously disabled
in creating the active topology. The following figure shows an example of
Spanning Tree.