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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Enabling Deterministic ECMP Next Hop

Deterministic ECMP next hop arranges all ECMPs in order before writing them into the content addressable memory (CAM).

For example, suppose the RTM learns eight ECMPs in the order that the protocols and interfaces came up. In this case, the forwarding information base (FIB) and CAM sort them so that the ECMPs are always arranged. This implementation ensures that every chassis having the same prefixes orders the ECMPs the same.

With eight or less ECMPs, the ordering is lexicographic and deterministic. With more than eight ECMPs, ordering is deterministic, but it is not in lexicographic order.

To enable deterministic ECMP next hop, use the appropriate command.

  • NOTE: Packet loss might occur when you enable ip/ipv6 ecmp-deterministic for the first-time only.
  • Enable IPv4 Deterministic ECMP Next Hop. CONFIGURATION mode. ip ecmp-deterministic
  • Enable IPv6 Deterministic ECMP Next Hop. CONFIGURATION mode. ipv6 ecmp-deterministic

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