
50 Rockwell Automation Publication ENET-RM002C-EN-P - May 2013
Chapter 3 Ethernet Infrastructure Features
Flex Links Protocol
The Flex Links protocol provides link-level, physical redundancy in redundant
star topologies. A pair of Layer 2 switch ports are configured to act as a backup to
each other:
• Built into Stratix 8000 and Stratix 8300 switches
• Requires redundant star topology
• Active/standby port scheme
– Provides an alternate path in case of failures, avoiding loops
– No bandwidth aggregation
– Equal speed ports recommended
– Provides fast fail over for multicast traffic
Distribution Switches
Catalyst 3750 Switch Stack
AS S A
Stratix 8000
Access Switches
A = Active
S = Standby
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