From: William.Nellis@cox.com
Date: Thu Nov 30 2006 - 01:28:18 ART
Portfast wont work by default on trunk links, so while in the config, it
isn't in use on the trunks.
Ref
3750-Switch1(config-if)#spanning-tree portfast
%Warning: portfast should only be enabled on ports connected to a single
host. Connecting hubs, concentrators, switches, bridges, etc... to this
interface when portfast is enabled, can cause temporary bridging
loops.
Use with CAUTION
The magic is below
%Portfast has been configured on FastEthernet1/0/5 but will only
have effect when the interface is in a non-trunking mode.
3750-Switch1(config-if)#span por
3750-Switch1(config-if)#span portfast ?
disable Disable portfast for this interface
trunk Enable portfast on the interface even in trunk mode
<cr>
3750-Switch1(config-if)#span portfast trunk
%Warning: portfast should only be enabled on ports connected to a single
host. Connecting hubs, concentrators, switches, bridges, etc... to this
interface when portfast is enabled, can cause temporary bridging
loops.
Use with CAUTION
3750-Switch1(config-if)#
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Michael Zuo
Sent: Tuesday, November 21, 2006 2:28 PM
To: Capt.Spock; Group Study
Subject: RE: spanning-tree portfast
If you remove the portfast, it will just take longer for the port to
come up ...
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Capt.Spock
Sent: Sunday, November 19, 2006 1:30 PM
To: Group Study
Subject: spanning-tree portfast
> On our production network I saw use of "spanning-tree portfast" on
several
> scenarios connected to switches... I know it makes sense to put this
command
> connected to servers and put spanning-tree portfast bpduguard
defaultglobal configuration. But if I do that now I am sure this will
screw up....
> Is it safe to remove spanning-tree portfast on any ports connected to
> switches?
>
> interface GigabitEthernet3/12
> description temp connection for CSS server management ports
> switchport access vlan 123
> switchport mode access
> spanning-tree portfast
>
>
> interface GigabitEthernet0/13
>
> description to another switch
>
> switchport trunk encapsulation dot1q
>
> switchport trunk native vlan 254
>
> switchport trunk allowed vlan 254
>
> switchport mode trunk
>
> *spanning-tree portfast*
>
> **
>
> interface GigabitEthernet0/13
>
> description to another switch
>
> *spanning-tree portfast *
>
> **
>
> **
>
> interface GigabitEthernet0/13
>
> description to another switch
>
> *spanning-tree portfast *
This archive was generated by hypermail 2.1.4 : Fri Dec 01 2006 - 08:05:49 ART