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Dell SmartFabric OS10 User Guide Release 10.5.3

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Symmetric hashing

For effective traffic monitoring on a port channel or ECMP interface, both forward and reverse traffic must flow through the same physical port. When hashing occurs, the forward and reverse traffic may flow through different physical interfaces. However, enabling symmetric hashing on the port channel or ECMP forces the bi-directional traffic flows to take the same physical ports.

When you enable symmetric hashing, the parameters that are used for hashing normalize before it enters into the hashing algorithm. The normalization process ensures that when parameters reverse, the hash output is same. The following parameters are used in calculating symmetric hashing:

  • Source IPv4 or IPv6 address
  • Destination IPv4 or IPv6 address
  • Source IPv4 or IPv6 port
  • Destination IPv4 or IPv6 port

To enable symmetric hashing for port channels or ECMP groups, use the following commands in CONFIGURATION mode: 

OS10(config)# enhanced-hashing symmetric-hashing ecmp
OS10(config)# enhanced-hashing symmetric-hashing lag

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