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Etherchannels
CCNA Etherchannels
Question | Answer |
---|---|
Major advantages of an etherchannel | more bandwidth, if one link fails other links stay up |
command to lists the channel group, port channel and ports in that channel group | show etherchannel ## summary |
If you run show etherchannel ## summary and see a D next to the Port channel it means what? | channel is down |
An I next to a port channel in the show etherchannel ## summary output means ? | the interface is working independently from the port channel |
This command lists the negotiation protocol used | show etherchannel ###port-channel |
channel-group commands for all physical interfaces must use the same channel-group number on the same switch (can be different on different switches) | True |
Configuring the etherchannel in auto or passive modes on both switches results in successful negotiation | False |
If a neighboring switch is using PAgP or LACP you should not use what keyword | ON, doing so will result in only one switch using Etherchannel |
New physical interfaces and neighbor switches must match | Speed, Duplex, Operational access or trunking state (all access or all trunk), access VLAN for access ports, Native & allowed VLANs for trunks, |
If settings are different on the neighbor switch where the Etherchannel link is operating what will happen? | PortChannel interface is placed in err-disabled state (same for physical interfaces) |
Industry standard protocol for Etherchannel negotiation. Ports can be configured in an active or passive state. | Link Aggregation Control Protocol (LACP) |
Cisco proprietary protocol for Etherchannel negotiation. Ports can be configured in an auto or desirable state. | Port Aggregation Protocol (PAgP) |
Command that statically adds the port into the channel | channel-group # mode on |
Command to enter config mode of the Port Channel | interface port-channel # |
Command that must be run on both the physical ports and the port channels to make them routable | no switchport |
Physical ports in the channel must use the same speed and duplex | True |
channel-group # mode {desirable | auto} is the command to configure an Etherchannel to negotiate using | PAgP |
channel-group # mode {active | passive} is the command to configure an Etherchannel to negotiate using | LACP |