A network administrator is configuring an EtherChannel link between switches SW1 and SW2 by using the command SW1(config-if-range)# channel-group 1 mode auto . Which command must be used on SW2 to enable this EtherChannel?SW2(config-if-range)# channel-group 1 mode onSW2(config-if-range)# channel-group 1 mode desirableSW2(config-if-range)# channel-group 1 mode activeSW2(config-if-range)# channel-group 1 mode passive
Question
A network administrator is configuring an EtherChannel link between switches SW1 and SW2 by using the command SW1(config-if-range)# channel-group 1 mode auto . Which command must be used on SW2 to enable this EtherChannel?SW2(config-if-range)# channel-group 1 mode onSW2(config-if-range)# channel-group 1 mode desirableSW2(config-if-range)# channel-group 1 mode activeSW2(config-if-range)# channel-group 1 mode passive
Solution
The command that must be used on SW2 to enable this EtherChannel is SW2(config-if-range)# channel-group 1 mode desirable.
Here's why:
The command "channel-group 1 mode auto" on SW1 is using the PAgP protocol in a non-aggressive mode. To establish an EtherChannel link using PAgP, the other end of the link (SW2 in this case) must be set to either desirable or auto mode.
However, if both ends are set to auto mode, the EtherChannel link will not form because both ends are waiting for the other end to start negotiations. Therefore, to ensure the EtherChannel link forms, you should set SW2 to desirable mode with the command "channel-group 1 mode desirable". This will actively attempt to negotiate an EtherChannel link with SW1.
Similar Questions
A network administrator is configuring an EtherChannel link between switches SW1 and SW2 by using the command SW1(config-if-range)# channel-group 1 mode auto . Which command must be used on SW2 to enable this EtherChannel?SW2(config-if-range)# channel-group 1 mode onSW2(config-if-range)# channel-group 1 mode desirableSW2(config-if-range)# channel-group 1 mode activeSW2(config-if-range)# channel-group 1 mode passive
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