200-301 · Question #1177
Which EtherChannel mode must be configured when using LAG on a WLC?
The correct answer is A. on. When configuring Link Aggregation Group (LAG) on a Cisco Wireless LAN Controller (WLC), the EtherChannel mode on the connected switch ports must be set to 'on'. This static configuration is required because WLCs do not support dynamic EtherChannel negotiation protocols.
Question
Options
- Aon
- Bpassive
- Cactive
- Dauto
How the community answered
(34 responses)- A88% (30)
- B9% (3)
- D3% (1)
Why each option
When configuring Link Aggregation Group (LAG) on a Cisco Wireless LAN Controller (WLC), the EtherChannel mode on the connected switch ports must be set to 'on'. This static configuration is required because WLCs do not support dynamic EtherChannel negotiation protocols.
Cisco WLCs operating in LAG mode do not support LACP (active/passive) or PAgP (auto/desirable) dynamic negotiation protocols; therefore, the EtherChannel must be statically configured in 'on' mode on the connected switch for the LAG to function correctly.
The 'passive' EtherChannel mode uses LACP to dynamically negotiate the EtherChannel, which is not supported by Cisco WLCs for LAG.
The 'active' EtherChannel mode uses LACP to dynamically negotiate the EtherChannel, which is not supported by Cisco WLCs for LAG.
The 'auto' EtherChannel mode uses PAgP to dynamically negotiate the EtherChannel, which is not supported by Cisco WLCs for LAG.
Concept tested: WLC LAG EtherChannel configuration mode
Source: https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/m_lag_config.html
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