Updated on March 20, 2020

IBFT 1.0

Besu nodes can operate (that is, submit transactions and receive blocks) in a Quorum IBFT 1.0 network, but cannot be validators.

To connect to a Quorum IBFT 1.0 network:

In the Quorum IBFT 1.0 genesis file, update the consensus protocol specified in the config property from istanbul to ibft.
```
    "config": {
     ...
     "ibft": {
     ...
    }
```
When starting Besu, specify the IBFT 1.0 genesis file using the --genesis-file option.