350-501 · Question #390
An ISP Is Implementing end-to-end fault monitoring for a customer based on the IEEE 802.3ah standard. The solution must detect when 15 or more corrupted Ethernet packets arrive within 10 ms and stop…
The correct answer is C. ethernet oam. To implement IEEE 802.3ah Ethernet OAM for fault monitoring, including corrupted packet detection and traffic cessation, the fundamental step is to enable Ethernet OAM on the relevant interface.
Question
An ISP Is Implementing end-to-end fault monitoring for a customer based on the IEEE 802.3ah standard. The solution must detect when 15 or more corrupted Ethernet packets arrive within 10 ms and stop propagating traffic through the ISP backbone network or to the customer side. Which configuration must the ISP engineer apply?
Options
- Aethernet oam link-monitoring enable
- Bethernet oam link-monitoring
- Cethernet oam
- Dethernet oam link-monitoring global enable
How the community answered
(51 responses)- A2% (1)
- B6% (3)
- C90% (46)
- D2% (1)
Why each option
To implement IEEE 802.3ah Ethernet OAM for fault monitoring, including corrupted packet detection and traffic cessation, the fundamental step is to enable Ethernet OAM on the relevant interface.
`ethernet oam link-monitoring enable` is a sub-command used within the `ethernet oam` context to activate link monitoring, not the initial enabling command on an interface.
`ethernet oam link-monitoring` refers to a configuration mode or a partial command and is not the complete and initial command to enable OAM services on an interface.
The `ethernet oam` command is the foundational configuration step to enable Ethernet OAM on an interface. Once OAM is enabled, specific link monitoring parameters, such as thresholds for corrupted packets and associated actions like shutting down the interface, can then be configured as sub-commands.
`ethernet oam link-monitoring global enable` is not a standard or necessary initial command for enabling per-interface 802.3ah OAM functionalities.
Concept tested: IEEE 802.3ah Ethernet OAM configuration
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/cether/configuration/15-mt/ce-15-mt-book/ce-oam.html
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