Podcast
Questions and Answers
What is the correct PAgP mode to configure when correcting an EtherChannel misconfiguration?
What is the correct PAgP mode to configure when correcting an EtherChannel misconfiguration?
- Auto
- On
- Passive
- Desirable (correct)
Why is the order of EtherChannel-related commands significant?
Why is the order of EtherChannel-related commands significant?
- To increase the EtherChannel speed
- To prevent STP errors which may block ports (correct)
- To enforce security protocols
- To ensure efficient bandwidth usage
What command can be used to verify that an EtherChannel is operational?
What command can be used to verify that an EtherChannel is operational?
- show etherchannel configuration
- show interface statistics
- show etherchannel summary (correct)
- show port-channel status
Which incorrect action could lead to STP errors during EtherChannel configuration?
Which incorrect action could lead to STP errors during EtherChannel configuration?
What must EtherChannel and STP do in relation to each other?
What must EtherChannel and STP do in relation to each other?
What might happen if the configuration changes are made incorrectly for EtherChannel?
What might happen if the configuration changes are made incorrectly for EtherChannel?
What should be done after changing the PAgP mode to desirable?
What should be done after changing the PAgP mode to desirable?
What is a common mistake when configuring an EtherChannel?
What is a common mistake when configuring an EtherChannel?
What is the primary purpose of EtherChannel?
What is the primary purpose of EtherChannel?
Which command is used to verify EtherChannel configuration?
Which command is used to verify EtherChannel configuration?
What mode does PAgP use to negotiate link aggregation when it actively seeks to form a channel?
What mode does PAgP use to negotiate link aggregation when it actively seeks to form a channel?
How does LACP ensure interoperability with devices that do not support EtherChannel?
How does LACP ensure interoperability with devices that do not support EtherChannel?
Which command would you use if you want to see the status of a specific EtherChannel port?
Which command would you use if you want to see the status of a specific EtherChannel port?
Which command is NOT used to troubleshoot EtherChannel configurations?
Which command is NOT used to troubleshoot EtherChannel configurations?
What does the command 'channel-group X mode passive' accomplish in LACP?
What does the command 'channel-group X mode passive' accomplish in LACP?
Which statement is true about PAgP modes?
Which statement is true about PAgP modes?
In the context of link aggregation protocols, what does LACP stand for?
In the context of link aggregation protocols, what does LACP stand for?
What is the primary difference between PAgP and LACP?
What is the primary difference between PAgP and LACP?
Which command can be used to verify an EtherChannel configuration?
Which command can be used to verify an EtherChannel configuration?
Which condition would prevent assigned ports from forming an EtherChannel?
Which condition would prevent assigned ports from forming an EtherChannel?
What must be compatible for PAgP to work correctly in an EtherChannel?
What must be compatible for PAgP to work correctly in an EtherChannel?
What is a common issue when configuring EtherChannel if trunking is inconsistently applied?
What is a common issue when configuring EtherChannel if trunking is inconsistently applied?
Which of the following PAgP modes must be set consistently between ports for successful negotiation?
Which of the following PAgP modes must be set consistently between ports for successful negotiation?
What command is used to display the general status of the port channel interface?
What command is used to display the general status of the port channel interface?
Which command would you use to verify multiple port channels in a single command?
Which command would you use to verify multiple port channels in a single command?
When configuring EtherChannel, which PAgP mode ensures passive participation in port aggregation?
When configuring EtherChannel, which PAgP mode ensures passive participation in port aggregation?
Which command provides specific information about a particular port channel interface?
Which command provides specific information about a particular port channel interface?
What is a primary benefit of configuring a redundant EtherChannel link?
What is a primary benefit of configuring a redundant EtherChannel link?
Which PAgP mode actively initiates the creation of an EtherChannel?
Which PAgP mode actively initiates the creation of an EtherChannel?
What becomes the default spanning tree behavior when using EtherChannel?
What becomes the default spanning tree behavior when using EtherChannel?
Which common troubleshooting step can help identify issues with an EtherChannel configuration?
Which common troubleshooting step can help identify issues with an EtherChannel configuration?
If an EtherChannel is not functioning, which command is least likely to be useful in verification?
If an EtherChannel is not functioning, which command is least likely to be useful in verification?
What information does the command 'show etherchannel summary' provide?
What information does the command 'show etherchannel summary' provide?
What does the output of the show etherchannel summary command indicate when the EtherChannel is down?
What does the output of the show etherchannel summary command indicate when the EtherChannel is down?
Which command should be used to view the detailed configuration of a port-channel interface?
Which command should be used to view the detailed configuration of a port-channel interface?
Incompatible configured PAgP modes on switches S1 and S2 typically lead to what outcome for EtherChannel?
Incompatible configured PAgP modes on switches S1 and S2 typically lead to what outcome for EtherChannel?
What is a potential cause for an EtherChannel connection to be non-operational?
What is a potential cause for an EtherChannel connection to be non-operational?
When troubleshooting an EtherChannel that is down, which of the following is a first step?
When troubleshooting an EtherChannel that is down, which of the following is a first step?
What can be inferred if the EtherChannel remains down despite correct configurations on S1?
What can be inferred if the EtherChannel remains down despite correct configurations on S1?
Which PAgP mode must be set identically on both switches for the EtherChannel to form?
Which PAgP mode must be set identically on both switches for the EtherChannel to form?
If an EtherChannel is misconfigured, what is the default mode of operation that might cause downtimes?
If an EtherChannel is misconfigured, what is the default mode of operation that might cause downtimes?
What happens when switches have different EtherChannel load balancing settings?
What happens when switches have different EtherChannel load balancing settings?
What is a likely troubleshooting step if the show etherchannel summary indicates 'down' due to PAgP incompatibility?
What is a likely troubleshooting step if the show etherchannel summary indicates 'down' due to PAgP incompatibility?
Flashcards are hidden until you start studying
Study Notes
EtherChannel Troubleshooting Steps
- Correcting misconfigurations involves changing PAgP mode to desirable to ensure interoperability with STP.
- Entering EtherChannel commands in a specific order is crucial to avoid STP errors that can cause ports to enter a blocking or errdisabled state.
- After correcting the configuration, use the
show etherchannel summarycommand to verify that the EtherChannel is now operational.
EtherChannel Configuration in Packet Tracer
- Configure basic switch settings as part of EtherChannel setup.
- Use Cisco PAgP for configuring a standard EtherChannel.
- Implement 802.3ad for advanced EtherChannel configurations.
- Ensure creation of redundant EtherChannel links for enhanced reliability.
Verification Commands for EtherChannel
- Utilize
show interfaces port-channelto check the status of the port channel interface. - The
show etherchannel summarycommand provides a concise summary for each port channel. - For detailed information on specific port channels, use
show etherchannel port-channel.
Key Terminology and Commands
- Link Aggregation: Combining multiple physical links into a single logical link.
- EtherChannel: A technology that allows bundling several Ethernet links.
- Port Aggregation Protocol (PAgP): A Cisco proprietary protocol for EtherChannel.
- Link Aggregation Control Protocol (LACP): An IEEE standard for link aggregation.
- Important commands include:
channel-group X mode [ desirable | auto | active | passive ]interface port-channel Xshow interfaces etherchannel
Common EtherChannel Issues
- Failure to form EtherChannel due to:
- Ports configured with different VLANs or trunk settings.
- Inconsistent native VLANs across ports.
- Mismatched trunk configuration among group ports.
- Non-compatible dynamic negotiation settings for PAgP and LACP.
Troubleshooting Example
- If the EtherChannel is down, check the output of
show etherchannel summary. - Inspect the configuration details with
show run | begin interface port-channelto identify incompatible PAgP modes between connected switches.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
