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7. Flow-Based Hash Computation

7. Flow-Based Hash Computation​

When a flow-based selection within a set needs to be performed, the IPv6 Source Address, the IPv6 Destination Address, and the IPv6 Flow Label of the outer IPv6 header MUST be included in the flow-based hash.

This may occur in any of the following scenarios:

  • A FIB lookup is performed and multiple ECMP paths exist to the updated destination address.

  • End.X, End.DX4, or End.DX6 is bound to an array of adjacencies.

  • The packet is steered in an SR Policy whose selected path has multiple SID lists.

Additionally, any transit router in an SRv6 domain includes the outer flow label in its ECMP flow-based hash [RFC6437].

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