200-301 · Question #578
Refer to the exhibit. Which two commands when used together create port channel 10? (Choose two.)
The correct answer is A. int range g0/0-1 channel-group 10 mode active C. int range g0/0-1 channel-group 10 mode passive. To create an LACP port channel, the connected interfaces must be configured with compatible Link Aggregation Control Protocol (LACP) modes that allow negotiation.
Question
Exhibits
Options
- Aint range g0/0-1 channel-group 10 mode active
- Bint range g0/0-1 channel-group 10 mode desirable
- Cint range g0/0-1 channel-group 10 mode passive
- Dint range g0/0-1 channel-group 10 mode auto
- Eint range g0/0-1 channel-group 10 mode on
How the community answered
(26 responses)- A81% (21)
- B4% (1)
- D8% (2)
- E8% (2)
Why each option
To create an LACP port channel, the connected interfaces must be configured with compatible Link Aggregation Control Protocol (LACP) modes that allow negotiation.
The `mode active` command places the interface in LACP active negotiation mode, actively initiating LACP packets to form an EtherChannel. When paired with `passive` mode on the other end, LACP can successfully establish the port channel.
`mode desirable` is a PAgP (Port Aggregation Protocol) mode, which is not compatible with LACP `active` or `passive` modes.
The `mode passive` command places the interface in LACP passive negotiation mode, listening for LACP packets from the other end to form an EtherChannel. When paired with `active` mode, LACP can successfully establish the port channel.
`mode auto` is a PAgP (Port Aggregation Protocol) mode, which is not compatible with LACP `active` or `passive` modes.
`mode on` creates a static EtherChannel without using LACP or PAgP, which means it will not negotiate with LACP `active` or `passive` modes.
Concept tested: EtherChannel LACP negotiation modes
Source: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3se/layer2/configuration_guide/b_layer2_3se_3850_cg/b_layer2_3se_3850_cg_chapter_0100.html
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