# network/switch/routing_alg.h
## `dofs::hash_ecmp`
`PortId hash_ecmp(NodeId src_node, PortId src_port, NodeId dst_node, PortId dst_port, uint32_t differentiator, uint16_t port_count) noexcept;`
## `dofs::hash_ecmp`
`inline PortId hash_ecmp(NodeId src_node, NodeId dst_node, uint32_t differentiator, uint16_t port_count) noexcept{`
## `dofs::hash_ecmp`
`return hash_ecmp(src_node, static_cast<PortId>(0), dst_node, static_cast<PortId>(0), differentiator, port_count);`