Forum Discussion
rafaelbn
Mar 07, 2019Cirrostratus
Hello 0x0ff.info!!
First things first. If your BIG-IP has more than one VLAN on the TRUNK interface, you must use 'spanning-tree port type edge trunk'. That is a Cisco recommendation when the connected device is not a switch but have multiple VLANs. If it was a catalyst switch, the command would be 'spanning-tree portfast trunk'.
The idea behind portfast is to make the switch converge STP quickly on the interface, going strait to the forwarding state.
What I think (wild guess here) that could be happening is that since the switch is seeing dot1q tags and it's ports are configured as edge you could be hitting a bug/odd behavior on the Cisco side.