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Difficulty: MediumWLAN Infrastructure Connections and LAG

An enterprise deploys a Cisco Lightweight Access Point (LAP) operating in FlexConnect mode at a remote branch office. The AP is configured to perform local switching for WLANs mapped to VLAN 10 (Sales) and VLAN 20 (Guests). The AP management traffic must be assigned to VLAN 100 and transmitted untagged over the physical link. The connected Cisco Catalyst switch port is configured as an 802.1Q trunk. Which switchport configuration command must be applied to the switch port to ensure AP management traffic and locally switched WLAN traffic function properly?

  1. switchport trunk native vlan 100Answer
  2. B
    switchport mode access
  3. C
    switchport trunk native vlan 1
  4. D
    channel-group 1 mode active

Answer

The switch interface must be configured with 'switchport trunk native vlan 100'.
When a Cisco Lightweight AP in FlexConnect mode is configured for local traffic switching across multiple VLANs (VLAN 10 and VLAN 20), the switch port must be an 802.1Q trunk. Because the AP sends its management traffic untagged by default, the switch port's native VLAN must match the AP's management VLAN (VLAN 100). The command 'switchport trunk native vlan 100' ensures untagged management frames are mapped into VLAN 100 while carrying tagged frames for the client VLANs.

Step-by-Step Solution

1
Identify the AP deployment mode and traffic requirements.
The AP operates in FlexConnect mode with local switching for VLAN 10 and VLAN 20, requiring an 802.1Q trunk port.
FlexConnect APs supporting multiple locally switched SSIDs mapped to different VLANs must connect to switch ports configured as 802.1Q trunks.
2
Determine how the AP management traffic is framed.
AP management traffic is assigned to VLAN 100 and sent untagged by default.
Cisco Lightweight APs send their CAPWAP management traffic untagged unless AP VLAN tagging is explicitly enabled.
3
Select the appropriate 802.1Q trunk configuration command.
Apply 'switchport trunk native vlan 100' on the switch port.
Setting the native VLAN to 100 ensures untagged frames received from the AP are mapped to VLAN 100 on the switch, while tagged frames for VLAN 10 and VLAN 20 are trunked appropriately.

Key Concept

FlexConnect AP Switch Port Infrastructure Trunking and Native VLAN Configuration
Estimated Time:1m 30s
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Topics

WLAN Infrastructure Connections and LAG

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