Network Connectivity - Lenovo Flex System SI4091 10Gb Product Manual

Network connectivity

The most common SI4091 connectivity topology, which can be used with both Lenovo and non-Lenovo
upstream network devices, is shown in the following figure.
Figure 4. SI4091 connectivity topology: Link Aggregation
In this loop-free redundant topology, each SI4091 is physically connected to a separate Top-of-Rack (ToR)
switch with static or LACP aggregated links.
When the SI4091 is used with the Lenovo RackSwitch switches, Virtual Link Aggregation Groups (vLAGs) can
be used for load balancing and redundancy purposes. The virtual link aggregation topology with the Lenovo
RackSwitch G8272 is shown in the following figure.
Figure 5. SI4091 connectivity topology: Virtual Link Aggregation
In this loop-free topology, aggregation is split between two physical switches, which appear as a single logical
switch. Each SI4091 is connected to ToR switches through static or LACP aggregated links.
Lenovo Flex System SI4091 10Gb System Interconnect Module 12