Ethernet automatic protection switching
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United States of America Patent
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-
Jul 20, 2004
Issued Date -
N/A
app pub date -
Oct 31, 2001
filing date -
Oct 31, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method and apparatus is provided for automatic protection switching in a ring network by creating a protection domain having a control vlan and protected data vlans and designating a master node and transit nodes connected by a primary port and a secondary port. The master node blocks the secondary port for data vlan traffic until it detects a fault either by notice from a transit node or by polling. When a fault is detected, the master node unblocks the secondary port for data vlan traffic. When the fault is restored, the transit node temporarily blocks the restored port to data vlan traffic thereby preventing a loop. Each time the secondary port is blocked and unblocked, the forwarding databases on all the nodes are flushed.
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