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4.4 Network
Redundancy
It is critical for industrial applications that network remains non-stop. JetNet 5008G-P
supports standard RSTP, Rapid Super Ring, Dual Homing II and Legacy Super Ring Client
modes.
Rapid Super Ring technology is Korenix 2
nd
generation Ring redundancy technology. This
is Korenix patent and protected in countries all over the world. RSR meets the fastest
failover time, 5 milliseconds, up to twenty units connected in a Gigabit Fiber Ring topology.
Advanced Dual-homing II technology also facilitates JetNet 5008G-P to connect with core
managed switch via standard Rapid Spanning Tree Protocol. With Dual Homing II
technology, you can also run RSTP to couple several Rapid Super Rings, which is also
known as Auto Ring Coupling.
To backward compatible with Legacy Super Ring technology implemented in JetNet
4000/4500 series switches, JetNet 5008G-P also supports Super Ring Client mode. The
Super Ring ports can pass through Super Ring control packets well and work with Super
Ring.
Besides Korenix ring technology, JetNet 5008G-P also supports 802.1D-2004 version
Rapid Spanning Tree Protocol (RSTP). New version of RSTP standard includes
802.1D-1998 STP, 802.1w RSTP.
Following commands are included in this group:
4.4.1 RSTP
4.4.2 RSTP Info
4.4.3 Rapid Super Ring
4.4.4 Ring Info
4.4.1 RSTP
RSTP is the abbreviation of Rapid Spanning Tree Protocol. If a switch has more than one
path to a destination, it will lead 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 will then select the best path (primary), and block the other path(s). It will
also keep track of the blocked path(s) 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, 802.1w is included into 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.
