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Bahaa J
Beginner

spnning-tree portfast trunk

Hi all,

i come to command related to mst

spanning-tree portfast trunk

also i know

spanning-tree portfast default

i think both has the same effect, just i need someone to confirm and explain the difference, thanks

Best regards                   

2 REPLIES 2
Reza Sharifi
Hall of Fame Expert

Hi,

There is a difference:

spanning-tree portfast trunk

This command allows you to configure PortFast on trunk ports

spanning-tree portfast default

This command enable PortFast by default on all access ports

reference:

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/25sg/command/reference/snmp_vtp.html#wp1072464

HTH

Aninda Chatterjee
Cisco Employee

Hi,

i come to command related to mst 

spanning-tree portfast trunk

This command is not necessarily specific to MST. This is a generic spanning-tree command which can be used in all modes.

As Reza explained, the spanning-tree portfast trunk, enables the portfast feature on a trunking interface - configuring just spanning-tree portfast on a trunking interface has no effect. This is most commonly used when you have trunked interfaces that go to servers, etc.

The spanning-tree portfast default command is an easy way of enabling the portfast feature on all access ports instead of going into each interface and enabling it one by one.

Regards,

Aninda