From: ccie2be (ccie2be@nyc.rr.com)
Date: Tue Aug 10 2004 - 09:51:47 GMT-3
Thanks Ty,
Actually, I was asking about the trunk option in the spanning-tree portfast
[trunk] command.
In your 2 examples, the trunk option doesn't appear after the spanning-tree
portfast command. Why not? Is that because the port is trunking in any
case? If so, then why bother to ever include "trunk" in the portfast
command?
If the trunk option (of portfast command) isn't needed when an IP Phone is
attached to a port, when is it needed?
Are there any situations where NOT having the trunk option configured will
cause problems? Or, conversely, are there situations where you MUST have
the trunk option or you'll have problems.
Actually, I can't think of any reason why the portfast command has a "trunk"
option. It seems to be completely pointless and only serves to distract
ccie candidates from more important topics.
What do you think?
Tim
----- Original Message -----
From: <tycampbell@comcast.net>
To: "ccie2be" <ccie2be@nyc.rr.com>; "Group Study" <ccielab@groupstudy.com>
Sent: Tuesday, August 10, 2004 8:14 AM
Subject: Re: spanning-tree portfast trunk
> Tim,
>
> When doing voice vlan, portfast is automatically configured wether in
trunk mode or not.
>
> here are 2 examples
>
> no trunking specified
> int f0/1
> switchport trunk encapsulation dot1q
> switchport voice vlan 105
> switchport access vlan 106
> spanning-tree portfast
>
> trunking specified
> int f0/2
> switchport trunk encapsulation dot1q
> switchport voice vlan 105
> switchport mode trunk
> switchport trunk native vlan 106
> spanning-tree portfast
>
> on the 2nd example, since you are trunking, you should use "switchport
trunk native vlan" in place of "switchport access vlan". The spanning-tree
portfast is automatically configured when you configure the voice vlan (I
believe)
>
> I hope that is what you were looking for :-)
>
> Ty
>
>
> > Hi guys,
> >
> > Is the only time the "trunk" option can be used correctly on above
command is
> > when port is connected to an IP Phone?
> >
> > Also, if an IP Phone is connected to a port, and span portfast is
configured
> > without the trunk option, will that cause a problem or generate an error
> > message?
> >
> > Thanks, Tim
> >
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