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Difficulty: MediumWLAN Infrastructure Connections and LAG

An infrastructure team is provisioning access layer switch interfaces for newly deployed Cisco Lightweight Access Points (LAPs) operating strictly in Local mode. All wireless client traffic will be encapsulated within CAPWAP tunnels back to the central Wireless LAN Controller (WLC). Which switch port configuration must be applied to the switch interfaces connecting directly to these Access Points?

  1. Configure each interface as a standard Layer 2 access port assigned to the AP management VLAN.Answer
  2. B
    Configure each interface as an 802.1Q trunk port carrying all wireless client VLANs to allow local traffic switching.
  3. C
    Configure each interface as an 802.1Q trunk port with the native VLAN set to the AP management VLAN and prune all client VLANs.
  4. D
    Configure LACP active mode EtherChannel bundles across adjacent switch interfaces connected to each individual AP.

Answer

The switch interfaces must be configured as standard Layer 2 access ports assigned to the AP management VLAN.
Local mode APs send all wireless user traffic through CAPWAP tunnels to the Wireless LAN Controller. Because the AP itself only requires network access to obtain an IP address and reach the WLC IP, the switch interface connecting to the AP only needs to be configured as a standard access port in the AP management VLAN.

Step-by-Step Solution

1
Analyze the operational mode of the Access Points
The APs operate in Local mode.
Local mode APs do not switch wireless client traffic locally onto the access switch; instead, all data and control traffic are encapsulated into CAPWAP tunnels sent directly to the central WLC.
2
Determine the VLAN and switchport requirements for Local mode APs
The AP requires only an IP address in the AP management VLAN to establish its CAPWAP tunnel.
Because client VLAN tags are encapsulated within the CAPWAP data payload, the physical switch port connected to the AP does not need to trunk multiple client VLANs.
3
Select the appropriate switchport mode configuration
Set the switch port mode to access and assign it to the AP management VLAN.
An access port provides untagged Layer 2 connectivity for the AP to receive an IP address via DHCP and communicate with the WLC.

Key Concept

Local mode AP switchport requirements vs FlexConnect mode requirements
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Topics

WLAN Infrastructure Connections and LAG

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