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Network Redundancy
It is critical for industrial applications that the network remains running at all times. The ES7506 supports:
•
Standard Rapid Spanning Tree Protocol (STP) and Rapid Spanning Tree Protocol (RSTP)
The ES7506 supports RSTP versions IEEE 802.1D-2004, IEEE 802.1D-1998 STP, and IEEE 802.1w
RSTP.
•
Redundant Ring
The Redundant Ring features 0 ms for restore and less than 5 ms for fail over for copper.
•
Rapid Dual Homing (RDH)
Advanced RDH technology allows the ES7506 to connect with a core managed switch easily. With RDH
technology, you can also couple several Rapid Super Rings or RSTP groups together, which is also known
as Auto Ring Coupling.
The following pages are included in this group:
•
RSTP
on Page 65
•
RSTP Information
•
Redundant Ring
on Page 68
•
Redundant Ring Information
Optionally, you can use the CLI to configure these features, see
RSTP
If a switch has more than one path to a destination, it
leads to message loops that can generate broadcast
storms and quickly bog down a network.
The spanning tree was created to combat the negative
effects of message loops in switched networks. A
spanning tree uses a spanning tree algorithm (STA) to
automatically sense whether a switch has more than one
way to communicate with a node. It then selects the best
path (primary), and blocks the other paths. It also keeps
track of the blocked paths in case the primary path fails.
Spanning Tree Protocol (STP) introduced a standard
method to accomplish this. It is specified in IEEE
802.1D-1998. Later, Rapid Spanning Tree Protocol
(RSTP) was adopted and represents the evolution of STP,
providing much faster spanning tree convergence after a
topology change. This is specified in IEEE 802.1w. In
2004, IEEE 802.1w is included into the IEEE 802.1D-
2004 version. This switch supports both RSTP and STP
(all switches that support RSTP are also backward
compatible with switches that support only STP).This
page allows you to enable/disable RSTP, configure the
global setting and port settings.
RocketLinx ES7506 User Guide: 2000529 Rev. F
on Page 67
on Page 69
Configuration Using the Web Interface
Network Redundancy (CLI)
Network Redundancy - 65
on Page 121.
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