From: Nick Griffin (nick.jon.griffin@gmail.com)
Date: Mon Dec 04 2006 - 12:18:36 ART
I understand the differences between global configuration versus interface,
however I do not see the results I think I should. From what I THOUGHT to be
true, "spanning-tree portfast bpdufitler default" should enable portfast
globally, on all the switch ports and revert out of portfast state when
BPDU's are received on the port, however does this also require the
"spanning-tree portfast" command to be entered on individual interfaces?
When I globally enable portfast with bpdufilter, I do not see spanning-tree
portfast enabled under "show spanning-tree interface x/y portfast" however
when I enable just portfast globally "spanning-tree portfast default" I do
see it enabled without having to do it at the interfaces. Did I just
misunderstand?
Default config:
SW2-3550(config)#do sh span int fas0/1 portf
VLAN0001 disabled
SW2-3550(config)#spanning-tree portfast default
%Warning: this command enables portfast by default on all interfaces. You
<--- Indication of portfast enabled
should now disable portfast explicitly on switched ports leading to hubs,
switches and bridges as they may create temporary bridging loops.
SW2-3550(config)#do sh span int fas0/1 portf
VLAN0001 enabled
SW2-3550(config)#spanning-tree portfast bpdufilter default <---- No
indication of portfast begin enabled
SW2-3550(config)#do sh span int fas0/1 port
VLAN0001 disabled <---- Port still transitions all spanning-tree
phases in this mode unless portfast enabled on the interface
Thoughts appreciated
Nick Griffin
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