spanning-tree portfast trunk on vsphere 5

[venerayan]

hi all,

there's  a warning on using spanning tree portfast on using on hub, switches, etc but do i need to use this on a vsphere network?  that network will have multiple vm using that network or connection.

thanks for any comment you may add.

[Reza Sharifi]

Hi,

If the switch is trunked to servers, then you can add portfast, but if it is switch to switch (trunked) then no need for portfast

HTH

[alam]

Hi,

That's normal to see a warning message after you applied spanning tree portfast.

Technically, you may need portfast feature (e.g. spanning-tree portfast) to speed up the port from listening state to forwarding state when you connect a host to switch port.

For a vSphere network, you may run different vm guest with different vlan in one server host. You may need portfast feature as well. You can use "spanning-tree portfast trunk" for your vm server.

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/25sg/command/reference/snmp_vtp.html#wp1162940

However, beware of loop when you use this command on a VM host with interface bridging.

Aqua