Yes, L2TP tunnel parameters are negotiated on tunnel creation. If you change the parameters they will have no affect until tunnel is re-created and negotiation happens again. This is similar to most connections that have a negotiation phase. Unless there is a method for dynamic re-negotiation in the middle of the connection, then the only way to get new parameters is forcibly (another example of this would be PPP sessions).
The command "show vpdn" will show which LAC have a tunnel to your LNS. You can then remove the entire tunnel (and all PPP sessions within it) by using the command "clear vpdn tunnel l2tp <LAC>", where you replace <LAC> with the name of the LAC in question (which is given from the "show vpdn" command earlier).
--- On Fri, 2/1/09, raghuram chary <raghujindia@gmail.com> wrote:
> From: raghuram chary <raghujindia@gmail.com>
> Subject: Re: [cisco-bba] l2tp tunnel is UP
> To: "Vince Mammoliti (vmammoli)" <vmammoli@cisco.com>
> Cc: cisco-bba@puck.nether.net
> Date: Friday, 2 January, 2009, 4:44 PM
> Yup,after clearing sessions tunnel is removed. So from this
> I can infer that
> if any changes under vpdn group are done, a restart of
> sessions needs to
> done.
> Please correct if i'm wrong.
>
> Thanks for the help
>
> On Thu, Jan 1, 2009 at 3:04 AM, Vince Mammoliti (vmammoli)
> <
> vmammoli@cisco.com> wrote:
>
> > Clear the sessions and see if it removes.
> >
> > V.
> >
> > HNY
> > --------------------------
> > Sent from my BlackBerry Wireless Handheld
> >
> >
> >
> > ----- Original Message -----
> > From: cisco-bba-bounces@puck.nether.net
> <cisco-bba-bounces@puck.nether.net
> > >
> > To: raghuram chary <raghujindia@gmail.com>;
> cisco-bba@puck.nether.net <
> > cisco-bba@puck.nether.net>
> > Sent: Wed Dec 31 11:44:20 2008
> > Subject: Re: [cisco-bba] l2tp tunnel is UP
> >
> >
> > In my experience, the tunnel will remain up until all
> sessions within
> > the tunnel go down.
> >
> > At 08:04 AM 12/31/2008, raghuram chary wrote:
> > >Hi all,
> > >Merry Christmas & Happy New Year to all.
> > >
> > >I have configured vpdn groups on LAC and LNS .I
> brought up single
> > >session.Now on LNS side I removed the
> vpdn-group,but still it shows
> > >Tunnel as UP and session is UP. Is this expected
> behaviour?
> > >Please explain.
> > >
> > >Thank you.
> > >Raghu
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> >
> > ---
> > Clayton Zekelman
> > Managed Network Systems Inc. (MNSi)
> > 344-300 Tecumseh Rd. E.
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> >
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