Symptoms

For BIG-IP on F5OS, a VLAN with the round-robin DAG configuration enabled applies round-robin DAG to all traffic on that VLAN. The tmos configuration for sys db dag.roundrobin.udp.portlist is not applied. Upgrading F5OS 2.0.0 without upgrading BIG-IP to a version that supports the portlist config will continue to apply round-robin DAG to all traffic on VLANs with round-robin enabled.

Impact

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

Conditions

Enable round-robin for a VLAN and apply values for sys db 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 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 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