Users Guide

Link Aggregation
Unlike IOA Automated modes (Standalone and VLT modes), the IOA Programmable MUX (PMUX) can support multiple uplink LAGs. You
can provision multiple uplink LAGs. The I/O Aggregator auto-configures with link aggregation groups (LAGs) as follows:
• All uplink ports are automatically configured in a single port channel (LAG 128).
• Server-facing LAGs are automatically configured if you configure server for link aggregation control protocol (LACP)-based NIC
teaming (Network Interface Controller (NIC) Teaming).
No manual configuration is required to configure Aggregator ports in the uplink or a server-facing LAG.
NOTE: Static LAGs are not supported on the SMUX Aggregator.
NOTE: In order to avoid loops, only disjoint VLANs are allowed between the uplink ports/uplink LAGs and uplink-to-uplink
switching is disabled.
Supported Modes
Standalone, VLT, PMUX, Stacking
Topics:
• How the LACP is Implemented on an Aggregator
• LACP Example
• Link Aggregation Control Protocol (LACP)
• Configuring Auto LAG
• Configuring the Minimum Number of Links to be Up for Uplink LAGs to be Active
• Optimizing Traffic Disruption Over LAG Interfaces On IOA Switches in VLT Mode
• Preserving LAG and Port Channel Settings in Nonvolatile Storage
• Enabling LACP link-fallback
• Enabling the Verification of Member Links Utilization in a LAG Bundle
• Monitoring the Member Links of a LAG Bundle
• Verifying LACP Operation and LAG Configuration
• Multiple Uplink LAGs
• Multiple Uplink LAGs with 10G Member Ports
• Multiple Uplink LAGs with 40G Member Ports
How the LACP is Implemented on an Aggregator
The LACP provides a means for two systems (also called partner systems) to exchange information through dynamic negotiations to
aggregate two or more ports with common physical characteristics to form a link aggregation group.
NOTE
: A link aggregation group is referred to as a port channel by the Dell Networking OS.
A LAG provides both load-sharing and port redundancy across stack units. An Aggregator supports LACP for auto-configuring dynamic
LAGs. Use CLI commands to display LACP information, clear port-channel counters, and debug LACP operation for auto-configured LAG
on an Aggregator.
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