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What is WTR in ERPS?
WTR (Wait-to-Restore) is a timer mechanism used in ERPS (Ethernet Ring Protection Switching). It prevents network instability after a failure has been resolved. ERPS is a protocol that ensures fast recovery in Ethernet ring networks by quickly switching traffic to an alternate path when a link failure occurs.
When a failed link in an ERPS ring is restored, the WTR timer delays the reactivation of the original path. This waiting period ensures that the link is stable before traffic is rerouted back to its primary path. Preventing unnecessary switching due to brief or intermittent link failures. The WTR timer value is configurable, allowing network administrators to set an appropriate delay based on network conditions.