Group Replication System Variables of IP address permissions for Group Replication, the allowlist on the seed member must include an IP address for the joining member for the protocol offered by the seed member, or a host name that resolves to an address for that protocol. This address or host name must be set up and permitted in addition to the joining member’s  group_replication_local_address  if the protocol for that address does not match the seed member’s advertised protocol. If a joining member does not have a permitted address for the appropriate protocol, its connection attempt is refused. For more information, see Section 18.6.1, “Group Replication IP Address Permissions” . Command-Line Format --group-replication-gtid-assignment- block-size=# System Variable group_replication_gtid_assignment_block_size Scope Global Dynamic Yes SET_VAR  Hint Applies No Type Integer Default Value 1000000 Minimum Value 1 Maximum Value (64-bit platforms) 9223372036854775807 Maximum Value (32-bit platforms) 4294967295 • group_replication_ip_allowlist • group_replication_gtid_assignment_block_size This system variable is a group-wide configuration setting. It must have the same value on all group members, cannot be changed while Group Replication is running, and requires a full reboot of the group (a bootstrap by a server with  group_replication_bootstrap_group=ON ) in order for the value change to take effect. If the group has a value set for this system variable, and a joining member has a different value set for the system variable, the joining member cannot join the group until the value is changed to match. If the group members have a value set for this system variable, and the joining member does not support the system variable, it cannot join the group. group_replication_gtid_assignment_block_size  specifies the number of consecutive GTIDs that are reserved for each group member. Each member consumes its own blocks and reserves more when needed. 3814 Command-Line Format --group-replication-ip- allowlist=value Introduced 8.0.22 System Variable group_replication_ip_allowlist Scope Global Dynamic Yes SET_VAR  Hint Applies No Type String