Xpress Ring

Xpress ring is Volktek's ring network switching protocol similar to Ethernet Ring Protection Switching, or ERPS, which has a switching time less than 20 ms from link break and to recover back when the link has been established. and also ensure no loops formed in the network. Two Xpress ring can be configured on any particular switch.

overview[edit]

The Xpress-Ring is a fast-acting, self-healing ring recovery technology that enables networks to recover from link failure within 20ms.If the network is planned correctly with an arbiter Switch and ring ports, the network will recover from any segment failure within a very short time. There are two roles (Forwarder and Arbiter) of the Switch in the Xpress-Ring. There is one and only one Switch is the Arbiter Switch and the others are the forwarder Switches. One of the ring ports of the Arbiter Switch will be set to blocking state. When one of the ring connection is broken, the blocked port will be set to the forwarding state.

Principle of operation[edit]

In a ring network, one switch is set as Arbiter and the remaining will be set as Forwarder. On each node, the left and right links of the ring network are specified as primary port and secondary port.

there are 3 stages to be explained in Xpress ring

Normal Operation
link breakdown
link recovery

Normal Operation[edit]

The secondary port of Arbiter will be blocked so that no loop is formed in the ring network. network will be normal operation.

link breakdown[edit]

when one of the operating link breaks the nodes which are connected to that faulty link notifies the other nodes about the link failure through link-fault message packets until it reaches the Arbiter. By seeing this link-fault message the Arbiter unblocks the secondary port and set it to forwarding state. So that the network remains uninterrupted. The switching time is less than 20 ms.

link recovery[edit]

Once the faulty link has been recovered then again the arbiter blocks its secondary port.

References[edit]

ERPS https://www.wago.com/infomaterial/pdf/51211262.pdf

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