Delta DVS-328 series, User Manual

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C h a p t e r 3 F e a t u r e d F u n c t i o n s
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3.3.2 Redundancy
To keep the industrial network run non-stop, the Ethernet redundancy network is an essential feature in the
industrial ethernet network. The Delta managed switch provides three topologies: ONE RING, ONE CHAIN and
ONE COUPLING.
These redundancy topology operating theories look like STP, but when a connection failure was caused in the
network, it can quickly recover the connection and work normally.
3.3.2.1 ONE RING Configuration
The ONE RING topology consists of nodes having two ports participating in ONE RING. There are two types of
nodes, which namely master nodes and slave nodes. There can be only one master and up to 250 slave
nodes.
Note:
The ports and LAGs which are the members of ONE RING should disable the STP mode and the
Loopback-Detection mode.
ONE RING Configuration
Item Description
Instance ID The ONE RING instance index. The range is 1 to 1000.
Mode
Defines the node role. The possible field values are:

Master : The master node manages the ring network, and there can only be
one master node in a ring network.

Slave: The slave nodes forward the hello packets along the ring, and there
are up to 250 slave nodes.
Port1
On the master node, it is the primary port.
On the slave node, it is just one of the member ports.
Port2
On the master node, it is the backup port.
On the slave node, it is just one of the member ports.
Ring Status
Defines the current ring status of the node.
Master state:

Discover : The ring is not completed yet

Monitor : The ring is completed and healthy.

Fault : The ring failed. The backup path is activated.
Slave State:

Forwarding : After the instance is created, it will stay at this state.

Hold : It is a middle state of the slave when 2 member ports are linked
down->up.
Admin Status The ONE RING instance entry status, including active, inactive, and etc.
3.3.2.2 ONE CHAIN Configuration
ONE CHAIN will connect a series of nodes to a LAN network.It consists of a head node, a tail node and a series
of member nodes. The head node hosts the head port that is forwarded by default.The tail node hosts the tail
port that is blocked by default. Any link failure caused in the ONE CHAIN will make the tail port as a forwarding
port. The topology will be restored after the recovery from failure.
Note:
The ports and LAGs which are the members of ONE CHAIN should disable the STP mode and the
Loopback-Detection mode.