ECMP Flow Hash Calculator
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.
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 |