From: Jonathan V Hays (jhays@jtan.com)
Date: Thu Jul 03 2003 - 14:32:08 GMT-3
Hi John,
I'm glad to see a bit of spirited discussion on this topic. However,
your statement that "only one management VLAN can be administratively
active at a time" was true for such switches as the Catalyst 1900,
Catalyst 2820, Catalyst 2900 XL, Catalyst 2950, and Catalyst 3500 XL
switches.
However, it simply is not true for the catalyst 3550. I am open to be
convinced otherwise. Please show me a link to the Catalyst 3550
configuration guide backing up your statement.
Now, there ARE some restrictions on management VLANs when it comes to
catalyst 3550 switch clustering, particularly if we are talking about
Automatic Discovery.
You can create multiple SVIs and use them to manage the switch for
different functions. One SVI might be used for switch clustering,
another might be used for SNMP, etc.
int vlan 10
ip address 10.1.1.10 255.255.255.0
int vlan 30
ip address 10.1.30.30 255.255.255.0
Thanks,
Jonathan
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of John Matijevic
> Sent: Thursday, July 03, 2003 11:58 AM
> To: Jonathan V Hays; 'SHARMA,MOHIT (HP-Germany,ex1)';
> ccielab@groupstudy.com
> 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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