ERPS (Ethernet Ring Protection Switching):

Question

Options

• AIs not supported on CX 6400 switch series
• BPrevents broadcast storms and implements fast-traffic switchover on a network where there are
• CDoes not prevent broadcast storms but implements fast-traffic switchover on a network where
• DIs not supported on CX 8400 switch series

• A
  4% (2)
• B
  87% (47)
• C
  7% (4)
• D
  2% (1)

Explanation

ERPS (Ethernet Ring Protection Switching), defined in ITU-T G.8032, does both jobs simultaneously: it blocks one link in the ring topology to prevent loops (and thus broadcast storms), AND it provides sub-50ms traffic switchover when a ring node or link fails - making option B correct.

Why the distractors are wrong:

• A & D are false platform claims - ERPS is supported on both the CX 6400 and CX 8400 switch series; these options are designed to trick you into doubting platform support.
• C is the classic "half-right" trap - ERPS does prevent broadcast storms by intentionally blocking one Ring Protection Link (RPL) owner port under normal conditions, so saying it "does not prevent" storms is incorrect.

Memory tip: Think of ERPS as a ring referee - it blocks one link to keep loops from forming (no broadcast storm), and immediately blows the whistle to reroute traffic (fast switchover) when something breaks. Both roles, one protocol.

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