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Zorluk: ZorWLAN Infrastructure Connections and LAG

A network administrator is preparing to bundle the physical distribution system ports on a Cisco Wireless LAN Controller (WLC) to increase bandwidth and redundancy toward an upstream Cisco Catalyst switch stack. Which two requirements or operational characteristics apply when Link Aggregation (LAG) is enabled on the Cisco WLC?

  1. The connected ports on the upstream switch must be combined into a single static EtherChannel bundle using the manual mode 'on'.Cevap
  2. B
    The controller distribution ports must be configured to negotiate the link bundle using standard Link Aggregation Control Protocol (LACP) active mode.
  3. Enabling LAG merges all physical distribution system ports into a single logical interface, preventing the creation of multiple separate EtherChannel groups on the controller.Cevap
  4. D
    If all physical links in the WLC LAG bundle fail, lightweight access points operating in default Local mode automatically switch client traffic locally.

Cevap

The correct options are that the upstream switch ports must be configured into a static EtherChannel using mode 'on', and that enabling LAG merges all physical distribution system ports into a single logical interface on the controller.
Enabling LAG on a Cisco Wireless LAN Controller consolidates all physical distribution ports into a single logical EtherChannel. Because the controller does not use dynamic EtherChannel negotiation protocols like LACP or PAgP, the connected upstream switch ports must be manually configured in static EtherChannel mode using the 'channel-group <id> mode on' command.

Adım Adım Çözüm

1
Analyze Cisco WLC EtherChannel / LAG negotiation protocol requirements.
Cisco WLC LAG requires static frame distribution without LACP or PAgP signaling.
The WLC does not run LACP or PAgP daemons on its physical ports, requiring the connected switch ports to be set to static EtherChannel ('mode on').
2
Determine how physical ports are grouped when LAG is enabled on the controller.
All physical distribution system ports form one single logical bundle.
On a Cisco WLC, LAG is a global setting that combines all distribution ports into one single logical link bundle; multiple separate EtherChannel groups cannot be defined.
3
Evaluate AP behavior in Local mode vs FlexConnect mode upon WLC link bundle loss.
Local mode APs cease forwarding client traffic because they cannot switch traffic locally.
Local mode APs encapsulate all user data inside CAPWAP tunnels to the WLC. Local switching requires FlexConnect mode.

Anahtar Kavram

Cisco WLC Link Aggregation (LAG) Architecture and Trunking Requirements
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