[c-nsp] Sub-Interface Support 122.25.SEC 3750

[Alex Foster]

Hi David,

I guess this must depend on the platform....on a 3550 you can configure
sub-interfaces in switchport mode.  I have already tried configuring the
3750 with 'no switchport' - but this proved unsuccessful as well.   I
can only assume that the software guys have removed this feature from
the CLI in this version.  

I am a little confused about your statement 'I seem to recall that
subinterfaces aren't allowed on "routed" ports' - if this is true - why
did you ask me to configure the port as 'no switchport' - this in effect
makes the port a routed port - and going with your statement this
wouldn't have worked anyway (although we know it does).

Regards

Alex

-----Original Message-----
From: David Prall [mailto:dcp at dcptech.com] 
Sent: 11 October 2005 13:15
To: Alex Foster; cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] Sub-Interface Support 122.25.SEC 3750

If the port was in "switchport" then you won't be able to configure
sub-interfaces. What happens when you do a "no switchport" first. The
default on the 6500 is "no switchport", while the default on everything
else
is "switchport".

David

--
David C Prall dcp at dcptech.com http://dcp.dcptech.com
  

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net 
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Alex Foster
> Sent: Tuesday, October 11, 2005 5:10 AM
> To: cisco-nsp at puck.nether.net
> Subject: RE: [c-nsp] Sub-Interface Support 122.25.SEC 3750
> 
> The interface was in switchport access mode..... but you still cant
> configure any subinterfaces.... but that aside, Im not sure about not
> being able to configure sub-ints on layer3/routed ports, I thought you
> could do this, although I guess it may depend on the platform/version.
> However, It seems SVIs/Trunks are the way ahead, so many 
> thanks for your
> help.
> 
> Regards
> 
> Alex
> 
> -----Original Message-----
> From: Bruce Pinsky [mailto:bep at whack.org] 
> Sent: 10 October 2005 20:19
> To: Alex Foster
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Sub-Interface Support 122.25.SEC 3750
> 
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Alex Foster wrote:
> > I Posted this a couple of days ago - and didn't get any 
> feedback - so
> > was just wondering if the Cisco guys on the list are aware of this -
> and
> > whether they have workarounds in place or a fix - I really need the
> use
> > of VRF with Sub-Interfaces - which would only be available 
> in the SEC
> > release - except for some reason the ability to configure
> Sub-interfaces
> > isn't there.....
> > 
> > The response you get from the switch is ....
> > 
> > Switch (config)#int gigabitEthernet 1/0/10.100
> >                                ^
> > % Invalid input detected at '^' marker.
> > 
> > 
> > "Strange one this, not sure if its been done on purpose or 
> whether the
> > software guys have left it out by mistake - but it appears as though
> > 122-25.SEC for the 3750 doesn't support sub-interfaces - 122.25.SEB
> did,
> > but I upgraded to SEC for VRF functionality and found I couldn't
> create
> > sub-interfaces - rolled back to SEB and there you have it 
> (but no VRF,
> > obviously).  Can anyone comment - or I have missed the boat and
> someones
> > decided that this feature is no longer of any use to anyone..."
> > 
> > Any help with this would be appreciated .... Regards
> > 
> 
> 
> Dumb question, but is the interface in switchport access mode?  a.
And VRF
> configuration requires that a port be a "routed" (layer 3) port.
> 
> 
> http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3750/12
> 225sec/375
> 0scg/swiprout.htm#wp1319235
> 
> 
> - --
> =========
> bep
> 
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