Symptoms

- For BIG-IP on F5OS, a VLAN configured with a round-robin DAG applies this setting to all traffic on that VLAN. The tmos configuration for sys db dag.roundrobin.udp.portlist will not be applied - Upgrading F5OS 2.0.0 without also upgrading BIG-IP to a version that supports the portlist configuration will continue to apply the round-robin Directed Acyclic Graph (DAG) to all traffic on VLANs where round-robin is enabled

Impact

All traffic on the configured VLAN with round-robin enabled has a round-robin DAG applied

Conditions

Enable round-robin for a VLAN and set the values for the system database `dag.roundrobin.udp.portlist`

Workaround

None

Fix Information

When a VLAN has round-robin enabled, the following behaviour applies: When BIG-IP is running on F5OS version before version 2.0.0: - Configuring round-robin enabled for a VLAN no longer applies to the round-robin DAG When BIG-IP is running on F5OS version 2.0.0 or later: - If sys db dag.roundrobin.udp.portlist value 0, the default value, no traffic on that VLAN has a round-robin DAG applied, consistent with the original BIG-IP implementation - If sys db dag.roundrobin.udp.portlist has a non-zero value, only traffic for the configured UDP ports will have round-robin DAG applied It is important to note that this is a behaviour change where a round-robin DAG for all traffic on a VLAN on F5OS is no longer possible with this BIG-IP change. Round-robin for all traffic on a VLAN is still possible with BIG-IP versions before this fix on all F5OS versions

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips