Updated Date: 07/07/2026
Behavior Changes in BIG-IQ Version 8.0.0
BIG-IQ version 8.0.0 includes the following changes to BIG-IQ setup and maintenance:
For optimum performance, F5 makes the following maximum round trip latency recommendations:
| For connections between these components | Round trip latency cannot exceed |
|---|---|
| between any two DCD or BIG-IQ devices in a DCD cluster | 75 ms. |
| between the BIG-IQ CM and the BIG-IP devices it manages | 250 ms. |
| between the managed BIG-IP devices and the DCDs that collect their data | 250 ms. |
For new installations of BIG-IQ version 8.0.0, you can now create a BIG-IQ virtual edition instance using a single network interface card (NIC). Previously, you needed at least two.
Note: Upgrading an existing BIG-IQ with a single NIC to version 8.0.0 is not currently supported.
BIG-IQ can now support managing up to 1000 application services.
You can now use an M5 instance type to create a BIG-IQ virtual edition instance on AWS. Previously, only M4 instance types were supported.
The first time you log in to BIG-IQ (before you license and complete the initial configuration), you are now prompted to reset the default password for admin from the BIG-IQ login screen. When you change the admin password from the BIG-IQ login screen, BIG-IQ uses that password to update both admin and root user information. You can change both the root and admin passwords when you license BIG-IQ.
SSL is now enabled for Elasticsearch found on data collection devices (DCDs) upgraded to version 8.0.0. Queries to the Elasticsearch cluster can be performed using the cURL command:
curl -k -u admin:admin https://localhost:9200/<query> Sample command for querying the DCD nodes:
curl -k -u admin:admin https://localhost:9200/_cat/nodes?BIG-IQ now supports DCD backup storage on SMB versions 1-3. The new default external storage settings are for version SMB3. SMB 1 is still supported, but this version is not recommended due to its security vulnerabilities. For more information about managing DCD snapshots see Setting up and Configuring a BIG-IQ Centralized Management Solution on support.f5.com.
BIG-IQ version 8.0.0 includes the following changes to BIG-IQ high availability:
TCP port for synchronizing with the peer BIG-IQ in a high availability configuration has changed The port BIG-IQ uses to synchronize with its peer in a high availability configuration has changed from 27017 to 5432. For more information about open ports required, refer to: https://support.f5.com/csp/article/K15612.
BIG-IQ version 8.0.0 includes the following changes to BIG-IQ upgrades:
In this release, the minimum downtime (rolling) upgrade scenario is not supported. For additional detail on how this might impact the upgrade process for you, refer to: Upgrading to BIG-IQ version 8.0.0
BIG-IQ version 8.0.0 includes the following changes to BIG-IQ user management:
Beginning with BIG-IQ version 8.0.0, a newly created RADIUS user group must have at least one authorization attribute. Only users having all the group’s authorization attributes will be members of the group.
After you upgrade to BIG-IQ 8.0.0 or later, any existing RADIUS user groups without any authorization attributes will contain no members. They will therefore serve no purpose. All existing RADIUS users will have no authorization to access BIG-IQ functionality through the default membership in a group.