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Zorluk: ZorWLAN Infrastructure Connections and LAG

A network engineer transitions several Cisco Lightweight Access Points (LAPs) deployed at a branch office from default Local mode to FlexConnect mode with local switching enabled for the corporate employee wireless network. The switch ports connected to these APs are currently configured as Layer 2 access ports assigned to VLAN 10 (Management). Following the transition, AP-to-WLC CAPWAP control connectivity remains healthy, but wireless clients connecting to the employee SSID (mapped to VLAN 20) fail to obtain IP addresses or communicate with local resources. Which configuration change must be applied to the access switch ports to restore client connectivity on the employee WLAN?

  1. Reconfigure the switch ports as 802.1Q trunk ports with VLAN 10 configured as the native VLAN and allow VLAN 20 on the trunk.Cevap
  2. B
    Maintain the switch ports as access ports in VLAN 10 and enable Link Aggregation Control Protocol (LACP) in active mode on the switch interfaces.
  3. C
    Reassign the switch access ports to VLAN 20 and configure STP PortFast on each AP interface.
  4. D
    Configure the switch ports as access ports in VLAN 10 and modify the native VLAN setting on the Wireless LAN Controller interface to VLAN 20.

Cevap

Reconfigure the switch ports as 802.1Q trunk ports with VLAN 10 configured as the native VLAN and allow VLAN 20 on the trunk.
When a Cisco LAP operates in FlexConnect mode with local switching, client traffic is broken out locally at the AP's physical switch port. To carry untagged AP management traffic alongside tagged client VLAN traffic (such as VLAN 20), the connected switch port must be configured as an 802.1Q trunk with the AP management VLAN (VLAN 10) specified as the native VLAN.

Adım Adım Çözüm

1
Analyze AP mode traffic behavior differences between Local mode and FlexConnect mode.
In Local mode, all client traffic is encapsulated in CAPWAP and sent to the WLC, requiring only a simple switch access port in the AP management VLAN. In FlexConnect local switching mode, client traffic is switched locally onto the Ethernet switch port.
Understanding how traffic leaves the AP determines the required switch port mode.
2
Identify the VLAN requirements for the FlexConnect AP connection.
The AP requires management traffic on VLAN 10 (untagged CAPWAP traffic) and wireless client traffic tagged for VLAN 20.
Carrying both tagged client traffic and untagged management traffic over a single physical cable requires an 802.1Q trunk.
3
Determine the necessary switch port trunk settings.
The switch port must be set to trunk mode (`switchport mode trunk`), with VLAN 10 set as the native VLAN (`switchport trunk native vlan 10`) so CAPWAP management traffic remains untagged, while allowing VLAN 20 for client traffic.
This allows the AP to maintain its CAPWAP tunnel while successfully bridging tagged client packets to the local switch.

Anahtar Kavram

FlexConnect AP Switch Port Infrastructure Trunking
Tahmini Süre:2m 0s
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Konular

WLAN Infrastructure Connections and LAG

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