[c-nsp] 6509 Interface Question

[Tim Stevenson]

At 05:39 AM 7/23/2005, Þórhallur Hálfdánarson contended:
>What I really would like to see is a command to define a range of VLANs 
>used for allocations of L3 interfaces, and ofcourse keep the asc/desc option.

Yes, this would be good.

>And, I might add, not requiring that reboot. :-)
>
>That reboot however leads me to the question: Is this dynamically assigned 
>(i.e. might L3 interfaces get other VLAN id's when a switch reboots?),

yes, they might, depending on the order of configuration & other factors.

The reason you have to reboot to change this is that we need to be able to 
allocate these VLANs immediately after the startup config is parsed (to 
learn the allocation scheme) but before any features are allowed to 
allocate internal VLANs.

I suppose in theory we could allow you to change the scheme on the fly, but 
it could be incredibly disruptive to the system/network depending on your 
current configuration and what's been allocated...

Tim


>or statically?
>
>
>Tolli
>
> > -----Original Message-----
> > From: cisco-nsp-bounces at puck.nether.net
> > [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Tim Stevenson
> > Sent: 22. júlí 2005 23:22
> > To: Gert Doering; Marko Milivojevic
> > Cc: cisco-nsp at puck.nether.net
> > Subject: Re: [c-nsp] 6509 Interface Question
> >
> > There is no way to reassign that vlan, except by
> > de-configuring the L3
> > interface, assigning the (old) internal vlan to the SVI etc that you
> > wanted, and then redefining the L3 interface.
> >
> > The vlan allocation policy is a good suggestion, though you
> > could then end
> > up with some high numbered vlan that you need for on-wire
> > use. But at least
> > the internal range is not taken right from the middle of the 4K range.
> >
> > Note that changing the vlan allocation policy requires a reboot.
> >
> > Tim
> >
> > At 02:37 PM 7/22/2005, Gert Doering contended:
> > >Hi,
> > >
> > >On Fri, Jul 22, 2005 at 09:15:48PM +0000, Marko Milivojevic wrote:
> > > > > This is something that makes me wonder.
> > > > >
> > > > > Is there a way to *change* that VLAN number, if you
> > need to?  Because
> > > > > you have to use that VLAN number on another link, due
> > to external
> > > > > factors that you can't change?
> > > >
> > > >    The only thing I found is "vlan internal allocation policy
> > > > {ascending|descending}". I guess that for all other
> > cases, you could
> > > > just use SVI's, instead of L3 interfaces, couldn't you?
> > >
> > >Well, of course.  You could clear an internal VLAN number by going
> > >to an explict VLAN+SVI, and then use that VLAN number for whatever
> > >you need it for.  Sounds ugly...
> > >
> > >gert
> > >
> > >--
> > >USENET is *not* the non-clickable part of WWW!
> > >
> > >//www.muc.de/~gert/
> > >Gert Doering - Munich, Germany
> > gert at greenie.muc.de
> > >fax: +49-89-35655025
> > gert at net.informatik.tu-muenchen.de
> > >_______________________________________________
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> >
> >
> >
> > Tim Stevenson, tstevens at cisco.com
> > Routing & Switching CCIE #5561
> > Technical Marketing Engineer, Catalyst 6500
> > Cisco Systems, http://www.cisco.com
> > IP Phone: 408-526-6759
> > ********************************************************
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> > and are intended for the specified recipients only.
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> >



Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Technical Marketing Engineer, Catalyst 6500
Cisco Systems, http://www.cisco.com
IP Phone: 408-526-6759
********************************************************
The contents of this message may be *Cisco Confidential*
and are intended for the specified recipients only.