A network engineer is connecting multiple physical distribution system ports of a Cisco AireOS Wireless LAN Controller (WLC) to an upstream Cisco Catalyst switch using Link Aggregation (LAG). Which two configuration requirements must be implemented on the switch interfaces to establish successful aggregation and traffic transport? (Select two.)
- Configure the EtherChannel bundle mode on the switch interfaces to static 'on' state.Answer
- BConfigure the EtherChannel negotiation mode on the switch interfaces to LACP active mode.
- Configure the switch interface or port-channel as an 802.1Q trunk port to carry traffic across multiple VLANs.Answer
- DSet the native VLAN on the switch trunk port to match the tagged dynamic wireless client VLAN.
Answer
The correct requirements are configuring the switch interfaces to static EtherChannel mode ('on') and setting the link to operate as an 802.1Q trunk.
Cisco AireOS WLCs utilize static Link Aggregation (LAG) and do not support dynamic EtherChannel negotiation protocols like LACP or PAgP. Consequently, switch ports connected to an AireOS controller must be set to static mode ('channel-group mode on'). Furthermore, since LAG bundles all physical controller ports into a single logical connection handling multiple SSIDs and management traffic, the upstream switch interface must be configured as an 802.1Q trunk port.
Step-by-Step Solution
Key Concept
Cisco AireOS WLC Link Aggregation (LAG) and Switchport Trunking Requirements