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Dell EMC SmartFabric OS10 User Guide Release 10.5.1

PDF

Examples

Normal traffic flow without resilient hashing

Normal traffic flow

Traffic flow with resilient hashing enabled

When you enable resilient hashing for ECMP groups, the flow-map table is created with 64 paths (the OS10 default maximum number of ECMP paths) and traffic is equally distributed. In the following example, traffic 1 maps to next hop 'A'; traffic 2 maps to next hop 'C'; and traffic 3 maps to next hop 'B.'

Traffic flow without resilient hashing

Member link goes down

In the following example, if member link D goes down, resilient hashing distributes the traffic intended for member link D to A and B. The existing 1, 2, and 3 traffic is not disturbed.

Member link goes down

Member link is added

However, when a new member link is added, resilient hashing completes minimal remapping for better load balancing, as shown:

Member link is added

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