From: Jonathan V Hays (jhays@jtan.com)
Date: Thu Jul 03 2003 - 11:17:40 GMT-3
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/c3550/12113ea1/3550s
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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