Dell Broadcom NetXtreme Family of Adapters - Manual (Page 81)

Broadcom Gigabit Ethernet Teaming Services: Broadcom NetXtreme BCM57XX User Guide
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Pings, however, flow between Red and Blue and between Red and Gray.
Furthermore, a failover event would cause additional loss of connectivity. Consider a cable disconnect on the Top Switch port
4. In this case, Gray would send the ICMP Request to Red 49:C9, but because the Bottom switch has no entry for 49:C9 in its
CAM Table, the frame is flooded to all its ports but cannot find a way to get to 49:C9.
Figure 3. Teaming Across Switches Without an Interswitch Link
The addition of a link between the switches allows traffic from/to Blue and Gray to reach each other without any problems.
Note the additional entries in the CAM table for both switches. The link interconnect is critical for the proper operation of the
team. As a result, it is highly advisable to have a link aggregation trunk to interconnect the two switches to ensure high
availability for the connection.
Figure 4. Teaming Across Switches With Interconnect