HPE2-W09 · Question #52
You are configuring Ethernet Ring Protection Switching (ERPS) on an ArubaOS-CX switch. Is this a guideline for configuring timers? Solution: The hold off timer causes ERPS switches to delay…
The correct answer is A. Yes. ERPS is a feature of ArubaOS-CX that prevents loops at layer 2 on ring networks. ERPS uses a protocol called Ring Auto Protection Switching (RAPS) to detect link failures and perform fast traffic switchover. ERPS has two timers that control the protection switching mechanism…
Question
You are configuring Ethernet Ring Protection Switching (ERPS) on an ArubaOS-CX switch. Is this a guideline for configuring timers? Solution: The hold off timer causes ERPS switches to delay unblocking a failed link after the link is restored. This can be useful to prevent frequent topology changes.
Options
- AYes
- BNo
How the community answered
(52 responses)- A79% (41)
- B21% (11)
Explanation
ERPS is a feature of ArubaOS-CX that prevents loops at layer 2 on ring networks. ERPS uses a protocol called Ring Auto Protection Switching (RAPS) to detect link failures and perform fast traffic switchover. ERPS has two timers that control the protection switching mechanism: guard timer and hold off timer. The guard timer prevents false switching caused by delayed or lost RAPS PDUs. The hold off timer causes ERPS switches to delay unblocking a failed link after the link is restored. This can be useful to prevent frequent topology changes due to link flapping or network instability. Therefore, this is a guideline for configuring timers for ERPS, and the correct answer is yes. For more information on ERPS and timers, refer to the Aruba Data Center Network Specialist (ADCNS) certification datasheet2 and the ERPS Guide for your switch model.
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