From: Jonathan V Hays (jhays@jtan.com)
Date: Thu Jul 03 2003 - 14:33:34 GMT-3
Here is the output from a "show run" on a Catalyst 3550.
!
interface VLAN1
no ip address
no ip directed-broadcast
no ip route-cache
shutdown
!
!
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of John Matijevic
> Sent: Thursday, July 03, 2003 12:49 PM
> To: SHARMA,MOHIT (HP-Germany,ex1); ccielab@groupstudy.com
> Subject: Re: Switchin Basics
>
>
> Hi Mohit,
> You cannot shutdown the management vlan, vlan1, try it. I
> would not spend
> to much time on this just realize that vlan1 is the default
> management vlan.
> If there is something more that the question is asking please
> post it here.
> Sincerely,
> Matijevic
> ----- Original Message -----
> From: "SHARMA,MOHIT (HP-Germany,ex1)" <mohit.sharma@hp.com>
> To: "'John Matijevic'" <matijevi@bellsouth.net>;
> <ccielab@groupstudy.com>
> Sent: Thursday, July 03, 2003 12:09 PM
> Subject: RE: Switchin Basics
>
>
> > Hi John,
> >
> > thanx for the followup, but what would then be exactly "the
> management
> > vlan"", If vlan 1 is shutdown and as Jonathan said there
> could be a number
> > of SVI's. How would the switch decide, which one to consider the
> management
> > vlan?Or is it like the default vlan the default management
> vlan is always
> > "1" ??
> >
> >
> >
> > -----Original Message-----
> > From: John Matijevic [mailto:matijevi@bellsouth.net]
> > Sent: Thursday, July 03, 2003 5:58 PM
> > To: Jonathan V Hays; 'SHARMA,MOHIT (HP-Germany,ex1)';
> >
> > Subject: Re: Switchin Basics
> >
> >
> > Hello Team,
> > I politely disagree with Jonathan in the following:
> > > However, on the Catalyst 3550 you can have multiple
> "management" VLANs.
> >
> > my answer is:
> > Only one management VLAN can be administratively active at a time.
> >
> > also,
> > You cant change the default vlan 1.
> >
> > As a followup note:
> > Management interfaces and vlans is documented in the 3550
> admin guide.
> The
> > management interface communicates with the switch ip address. The ip
> address
> > is associated with the management vlan. You can only have
> one management
> > vlan at a time. The management vlan is the vlan used to
> manage the switch,
> > so when you add a vlan and assign an ip address, that vlan
> communicates
> with
> > the management vlan.
> > Hopefully this helps clarify,
> > Sincerely,
> > Matijevic
> >
> > ----- Original Message -----
> > From: "Jonathan V Hays" <jhays@jtan.com>
> > To: "'SHARMA,MOHIT (HP-Germany,ex1)'" <mohit.sharma@hp.com>;
> > <ccielab@groupstudy.com>
> > Sent: Thursday, July 03, 2003 10:17 AM
> > Subject: RE: Switchin Basics
> >
> >
> > > See below.
> > >
> > > > -----Original Message-----
> > > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> > > > Behalf Of SHARMA,MOHIT (HP-Germany,ex1)
> > > > Sent: Thursday, July 03, 2003 7:22 AM
> > > > To: 'ccielab@groupstudy.com'
> > > > Subject: RE: Switchin Basics
> > > >
> > > >
> > > > Hi all,
> > > >
> > > > I know this may sound like a really stupid question from a
> > > > guy preparing for
> > > > the esteemed exam, but could someone please take out some
> > > > time to enmlighten
> > > > me. I really need to get this basics clear.
> > > >
> > > > Thanks for your understanding and cooperation.
> > > >
> > > > Smiles,
> > > >
> > > > Mohit.
> > > > -----Original Message-----
> > > > From: SHARMA,MOHIT (HP-Germany,ex1) [mailto:mohit.sharma@hp.com]
> > > > Sent: Thursday, July 03, 2003 12:54 AM
> > > > To: 'ccielab@groupstudy.com'
> > > > Subject: Switchin Basics
> > > >
> > > >
> > > > Hi All,
> > > >
> > > > This may sound like one of the basic questions for switching,
> > > > however I just
> > > > tried these on my newly acquired 3550's and am really confused.
> > > >
> > > > 1.> If asked to change the default VLAN, how does it work? I
> > > > have tried
> > > > using the default vlan <x> command, but when I do sh vlan it
> > > > always gives me
> > > > the default vlan as 1. First I thought that after
> giving this command
> > > > changing the names would do the trick but it still allocates
> > > > the unused
> > > > ports to VLAN 1 :(
> > > >
> > >
> > > ****
> > > The default VLAN on an unconfigured Cisco switch is VLAN
> 1. I don't
> > > think this can be changed. For an unconfigured switch, it
> simply means
> > > that by default all ports are a member of VLAN 1. I suppose the
> > > programmers could have alternatively assigned all ports
> to no VLAN at
> > > all, which would have forced the sysadmin to assign a
> VLAN to a port
> > > before using the switch. With a default of VLAN 1 on all
> ports, you can
> > > turn on the switch and immediately plug in ethernet
> cables and start
> > > using the switch.
> > >
> > > I think your lab scenario is really asking you to assign ports to
> > > different VLANs. Or maybe to assign a new management VLAN
> by creating a
> > > new switched virtual interface (SVI). See below.
> > > ****
> > >
> > >
> > > > 2.> What does management interface mean. If I have a
> number of VLAN
> > > > interfaces with IP address configured, how does the switch
> > > > decide, which one
> > > > is the management interface???IS it the default VLAN
> again at play???
> > >
> > >
> > > ****
> > > Older IOS-type switches (e.g., 2900/3550XL, 2950, etc.)
> only allowed one
> > > "management" VLAN. For example, to shut down VLAN 1 as
> the management
> > > VLAN on a 2900/3500 XL switch you used the "management" command.
> > >
> > > However, on the Catalyst 3550 you can have multiple
> "management" VLANs.
> > > (Cisco does not use the term "management" very often in the 3550
> > > configuration guide.) To do this, you just create anther
> SVI with the
> > > "int vlan XXX" command. To disable VLAN 1 as a "management" VLAN:
> > >
> > > int vlan 1
> > > shutdown
> > >
> > >
> http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/1211
> 3ea1/3550s
> > > cg/swint.htm#1026951
> > >
> > > <quote>
> > > By default, an SVI is created for the default VLAN (VLAN
> 1) to permit
> > > remote switch administration. Additional SVIs must be explicitly
> > > configured. In Layer 2 mode, SVIs provide IP host
> connectivity only to
> > > the system; in Layer 3 mode, you can configure routing
> across SVIs.
> > > </quote>
> > >
> > > HTH
> > >
> > > Jonathan
> > >
> > > ****
> > >
> > >
> > > >
> > > > Thanks as always for showing me the light :)
> > > >
> > > > Smiles,
> > > >
> > > > Mohit.
> > > >
> > > >
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