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Assign tunnel route priorities

Magic Transit uses a static configuration to route your traffic through Generic Routing Encapsulation (GRE) tunnels from Cloudflare’s edge to your data center(s).

You must assign a route priority to each GRE tunnel–subnet pair in your GRE configuration, as follows:

  • Lower values have greater priority.
  • When the priority values for prefix entries match—as illustrated by the 103.21.244.0/24 subnet in the example routing configuration (in boldface)—Cloudflare uses equal-cost multi-path (ECMP) packet forwarding to route traffic.

For more on how Cloudflare uses ECMP packet forwarding, see Traffic steering.

For an example edge routing configuration, refer to this table:

GRE tunnelSubnetPriority
GRE_1_IAD103.21.244.0/24100
GRE_2_IAD103.21.244.0/24100
GRE_3_ATL103.21.244.0/24100
GRE_4_ATL103.21.244.0/24100
GRE_1_IAD103.21.245.0/24200
GRE_2_IAD103.21.245.0/24200
GRE_3_ATL103.21.245.0/24100
GRE_4_ATL103.21.245.0/24100