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Difficulty: MediumWLAN Infrastructure Connections and LAG

A network administrator is connecting four physical distribution system ports of a Cisco AireOS Wireless LAN Controller to an upstream Cisco Catalyst switch. Link Aggregation (LAG) is enabled on the controller to increase bandwidth and provide redundancy. Which port-channel configuration must be applied to the upstream Catalyst switch interfaces?

  1. Configure all connected switch interfaces into a single port-channel group using static mode 'on' with 802.1Q trunking enabled.Answer
  2. B
    Configure the switch interfaces to dynamically negotiate the bundle using LACP active mode.
  3. C
    Split the physical distribution system ports into two separate port-channel groups to isolate FlexConnect local traffic.
  4. D
    Configure each physical switch interface as an access port assigned to the native VLAN.

Answer

Configure all connected switch interfaces into a single port-channel group using static mode 'on' with 802.1Q trunking enabled.
When LAG is enabled on a Cisco AireOS Wireless LAN Controller, all physical distribution system ports are bundled into a single logical interface. The connected Cisco Catalyst switch must be configured with all corresponding physical ports in a single EtherChannel port-channel set to static mode 'on' and operating as an 802.1Q trunk.

Step-by-Step Solution

1
Identify the Link Aggregation (LAG) characteristics supported on Cisco AireOS Wireless LAN Controllers.
AireOS controllers support LAG only as a single logical EtherChannel bundle across all distribution system ports, requiring static EtherChannel mode ('on') without dynamic negotiation protocols (LACP/PAgP).
The controller software architecture requires all physical DS ports to participate in a single static EtherChannel bundle.
2
Determine switchport encapsulation and trunking requirements for WLC connectivity.
The switchport interface connecting to the WLC LAG bundle must be an 802.1Q trunk port to transport management and WLAN VLAN traffic.
Wireless controllers handle multiple wireless networks mapped to separate 802.1Q VLAN tags.

Key Concept

WLAN Infrastructure Connections and WLC LAG Switch Configuration
Estimated Time:1m 30s
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Topics

WLAN Infrastructure Connections and LAG

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