Which IEEE standard is required when a Cisco WLC has multiple distribution-system ports but only one IP address configured?

When a Cisco Wireless LAN Controller (WLC) uses multiple distribution-system ports but needs to present a single logical interface with one IP address, it requires port aggregation. The IEEE 802.3ad standard defines Link Aggregation Control Protocol (LACP), which allows multiple physical Ethernet links to be combined into a single logical link. This provides increased bandwidth and redundancy. 802.1q defines VLAN tagging, which segments a network but doesn't aggregate physical links. 802.1d defines Spanning Tree Protocol (STP), which prevents loops in a network but doesn't combine links. 802.1af is not a recognized IEEE standard for this context.