200-301 · Question #971
Which channel-group mode must be configured when multiple distribution interfaces connected to a WLC are bundled?
The correct answer is B. Channel-group mode on.. When bundling multiple distribution interfaces to a Wireless LAN Controller (WLC), the channel-group mode on must be used for EtherChannel configuration. This is because WLCs typically do not support dynamic EtherChannel negotiation protocols like LACP or PAgP.
Question
Options
- AChannel-group mode passive.
- BChannel-group mode on.
- CChannel-group mode desirable.
- DChannel-group mode active.
How the community answered
(57 responses)- A2% (1)
- B93% (53)
- C4% (2)
- D2% (1)
Why each option
When bundling multiple distribution interfaces to a Wireless LAN Controller (WLC), the `channel-group mode on` must be used for EtherChannel configuration. This is because WLCs typically do not support dynamic EtherChannel negotiation protocols like LACP or PAgP.
`Channel-group mode passive` is for LACP, which is a dynamic negotiation protocol and typically not supported by WLCs for EtherChannel.
When connecting to a Wireless LAN Controller (WLC), EtherChannel must be configured in `channel-group mode on`. WLCs generally do not support dynamic EtherChannel negotiation protocols like LACP (active/passive) or PAgP (desirable/auto), requiring a static EtherChannel configuration where all ports are forced into the channel.
`Channel-group mode desirable` is for PAgP, which is a dynamic negotiation protocol and typically not supported by WLCs for EtherChannel.
`Channel-group mode active` is for LACP, which is a dynamic negotiation protocol and typically not supported by WLCs for EtherChannel.
Concept tested: EtherChannel configuration for WLC connectivity
Source: https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/configuring_interfaces.html
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