spanning-tree portfast on trunk

[jean-christophe.valiere]

Hi Gurus,

I see many times people configuring uplink to ESXi as trunk w/ portfast as they are stating that all VMs are single attached to the network.

I'm not conviced about this fact as some admins could create a VM w/ 2 interfaces connected to the same VLAN and start doing some STP for whatever reason.

This point me to keep uplink to ESXi as standard trunk.

To me, it seems that enabling portfast gives no advantage ?

Adding bpdu guard would make one single VM to have the whole ESXi down.

Eventually, I could have uplink as trunk w/ portfast and bpdu filter ?

Does all these make sense to you or did I miss something ?

Thanks & best regards,

Jean-Christophe

[Seb Rupik]

Hi there,
The command spanning-tree portfast will have no effect on a trunk link. It is only effective on access ports.
Much in the same way you can have switchport access vlan xxx, it is only active if the switch port is in access mode.
Of course having spanning-tree portfast trunk will transition the port to trunk link to forwarding as soon as it comes up.

cheers,
Seb.

[jean-christophe.valiere]

Hi Seb,

Yes, I was meaning spanning-tree portfast trunk yes.

Regards,

Jean-Christophe