350-501 · Question #221
Refer to the exhibit. Router 1 and router 2 are running OSPF Area 0. The router logs on both routers show that the LDP link has flapped. Which configuration must the engineer apply to the two…
The correct answer is D. Router 1(config)# ip cef distributed. To improve LDP session stability and prevent flapping on a link, it is crucial to ensure that the underlying packet forwarding mechanism is robust and highly efficient. Cisco Express Forwarding (CEF) is fundamental for this stability.
Question
Refer to the exhibit. Router 1 and router 2 are running OSPF Area 0. The router logs on both routers show that the LDP link has flapped. Which configuration must the engineer apply to the two routers to implement session protection on the link?
Exhibit
Options
- ARouter 1(config)# ip cef distributed
- BRouter 1(config)# ip cef distributed
- CRouter 1(config)# ip cef distributed
- DRouter 1(config)# ip cef distributed
How the community answered
(18 responses)- B11% (2)
- C6% (1)
- D83% (15)
Why each option
To improve LDP session stability and prevent flapping on a link, it is crucial to ensure that the underlying packet forwarding mechanism is robust and highly efficient. Cisco Express Forwarding (CEF) is fundamental for this stability.
This choice is identical to the correct answer, indicating a potentially flawed question with repeated options.
This choice is identical to the correct answer, indicating a potentially flawed question with repeated options.
This choice is identical to the correct answer, indicating a potentially flawed question with repeated options.
Enabling 'ip cef distributed' on a router ensures that packet forwarding is handled by dedicated line cards, offloading the main CPU and providing a highly optimized, stable data plane. A stable and distributed CEF environment is foundational for reliable LDP session operation, preventing disruptions that can lead to session flapping.
Concept tested: LDP session stability and Cisco Express Forwarding (CEF)
Source: https://www.cisco.com/c/en/us/td/docs/ios/ipswitch/configuration/guide/12_2/isw_c/xcflan.html
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