Release Notes

PS Series SAN design
42 Dell PS Series Configuration Guide
Interconnect
type
Primary purpose
Analysis
LAG
Create a data path
between switches in
one location or subnet
with those in another
location or subnet
Advantages:
• Leverages Ethernet standard extensions
• Can be used to interconnect switches from different vendors
• Can use Link Aggregation Protocols (LACP/EtherChannel) to
pool multiple 1GbE or 10GbE links into a single logical link
providing bandwidth and redundancy
• Can upgrade switch firmware on each switch independently
Concerns:
• Some solutions limited to eight port link aggregation group
• Spanning Tree Protocol must be used if more than two switches
are used causing some links to be “blocked” and reducing
bandwidth availability
• LAG bandwidth overload risk
Recommendation:
• Use when stacking is not available
• Use when connecting to aggregation/core switching
infrastructure
• Use when switches are from different vendors
• Use when highest availability is required