How to add an Equal Cost Multipath Route (ECMP) to IP Routing?

Solution Verified - Updated -

Issue

  • How to add an Equal Cost Multipath Route (ECMP) to IP Routing?
  • How do I add an IPv4 or IPv6 multipath route?
  • The RHEL kernel has CONFIG_IP_ROUTE_MULTIPATH enabled, how to use it?
  • Trying to add two routes results in an error:
# ip route add DESTINATION via GATEWAY1 dev NET1 metric 1000
# ip route add DESTINATION via GATEWAY2 dev NET2 metric 1000
RTNETLINK answers: File exists

Environment

  • Red Hat Enterprise Linux 8
  • IPv4 or IPv6 IP addresses
  • Equal Cost Multipath Routing (ECMP) added using ip route command

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