Question 260
A network engineer expects two links configured in PAgP desirable and LACP active to aggregate into a common port-channel. During troubleshooting: Both interfaces are up individually but no port-channel forms. Which underlying cause best explains the recorded behavior?
Explanation
Correct Answer
The actual technical cause is: The peers use incompatible EtherChannel negotiation protocols. It specifically explains the observation: both interfaces are up individually but no port-channel forms. The correcting configuration is: configure compatible EtherChannel negotiation protocol and modes at both peers rather than mixing LACP and PAgP.
Incorrect Answers
That diagnosis is supported by a different symptom: One link is individual despite physical link-up when both peers switch to passive mode. Here the recorded observation is: both interfaces are up individually but no port-channel forms. The applicable cause is: the peers use incompatible EtherChannel negotiation protocols.
That diagnosis is supported by a different symptom: The port-channel remains up but one physical link is excluded from the bundle. Here the recorded observation is: both interfaces are up individually but no port-channel forms. The applicable cause is: the peers use incompatible EtherChannel negotiation protocols.
That diagnosis is supported by a different symptom: Many sessions all map to one member because the chosen hash input is nearly constant for those conversations. Here the recorded observation is: both interfaces are up individually but no port-channel forms. The applicable cause is: the peers use incompatible EtherChannel negotiation protocols.






Implementing Cisco Enterprise Network Core Technologies (ENCOR) (350-401) Practice Tests