Last update: December 2, 2021

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 item from istanbul to ibft.
- In the ibft item:
  - Change epoch to epochlength.
  - Add blockperiodseconds, the minimum block time in seconds.
  - Add requesttimeoutseconds, the timeout for each consensus round before a round change, in seconds.
  - Remove policy. Besu always uses a round-robin validator selection policy.
- Remove the configuration item isQuorum: true.
```
    "config": {
     ...
     "ibft": {
       "epochlength": 30000,
       "blockperiodseconds": 2,
       "requesttimeoutseconds": 4,
       "policy": 0,
       "ceil2Nby3Block": 0
    }
```
When starting Besu, specify the IBFT 1.0 genesis file using the --genesis-file option.