From: Dennis J. Hartmann (dennisjhartmann@hotmail.com)
Date: Tue Apr 26 2005 - 08:00:41 GMT-3
You can use the same command for the backup root bridge to ensure
diameter consistency during failover. I would configure both switches in
case Cisco is looking for this as a result.
spanning-tree vlan vlan-id root secondary [diameter net-diameter [hello-time
seconds]]
Configure a switch to become the secondary root for the specified VLAN.
For vlan-id, you can specify a single VLAN identified by VLAN ID number, a
range of VLANs separated by a hyphen, or a series of VLANs separated by a
comma. The range is 1 to 4094.
(Optional) For diameter net-diameter, specify the maximum number of
switches between any two end stations. The range is 2 to 7.
(Optional) For hello-time seconds, specify the interval in seconds between
the generation of configuration messages by the root switch. The range is 1
to 10 seconds; the default is 2 seconds.
Use the same network diameter and hello-time values that you used when
configuring the primary root switch. See the "Configuring the Root Switch"
section.
-Dennis Hartmann
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
micsoniu@telus.net
Sent: Monday, April 25, 2005 3:51 PM
To: san
Cc: ccielab@groupstudy.com
Subject: Re: STP Timers
On the root bridge:
spann vlan X root primary diameter 3
HTH
Quoting san <san.study@gmail.com>:
> Is there a way to change the STP diameter from default 7 to say 3 ? I
> came accross this question in one of the practice labs & the answer
> was something with changing max-age (15 from default 20) & forward
> delay. (17 from default 20)
>
> Can some one pass me a link or explain how to derive it. ?
>
> Searched around Group Study & Goolge could not find. Attached link
> shows there is a command called "dia" for cat switches. Not sure for
> IOS based switches.
>
> related link:
>
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a0080
094
954.shtml
>
> /SAN
>
>
>
> On 4/25/05, vazman@aol.com <vazman@aol.com> wrote:
> > Set the max age time to 6 sec and forward-time to 5 sec. Total time
> > would
> be 5+5+6 = 16sec.
> >
> > S1(config)#spanning-tree vlan 1 max-age ?
> > <6-40> maximum number of seconds the information in a BPDU is
> > valid
> >
> > S1(config)#spanning-tree vlan 1 forward-time ?
> > <4-30> number of seconds for the forward delay timer
> >
> > HTH
> >
> > -----Original Message-----
> > From: micsoniu@telus.net
> > To: 'Group Study' <ccielab@groupstudy.com>
> > Sent: Mon, 25 Apr 2005 11:35:28 -0700
> > Subject: STP Timers
> >
> > Hi,
> >
> > How do we set the STP timers so that an access port would move from
> blocking
> > state into the forward state in exactly 16 seconds ?
> >
> > Thanks.
> >
> > Narcis
> >
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