ECMP Flow Hash Calculator

Enter a 5-tuple to see which uplink each vendor's hash algorithm selects. Diagnose uneven load distribution and plan flow placement.

Source IP

Destination IP

Source Port

Destination Port

Protocol

Number of Uplinks (ECMP paths)

Algorithm Reference

Vendor / Algorithm	Hash Input	Notes
XOR (Cisco legacy)	src_ip XOR dst_ip XOR (src_port XOR dst_port)	Fast, poor distribution for similar IPs
CRC32 (Arista / Cisco NX-OS)	Full 5-tuple as byte array	Much better distribution; default on modern gear
FNV-1a (Juniper)	Full 5-tuple as byte array	Fast non-crypto hash; good avalanche effect