From: Jonathan V Hays (jhays@jtan.com)
Date: Thu Jul 03 2003 - 16:53:02 GMT-3
Emad,
See the table of IOS command modes here.
http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12113ea1/3550s
cg/swcli.htm#1019901
Also, check out this link, which illustrates that many VLAN operations
can be performed in more than one mode. But you should note carefully
that some operations look similar but don't have the same effect in all
modes.
http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12113ea1/3550s
cg/swvlan.htm#1196935
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of Emad
> Sent: Thursday, July 03, 2003 3:09 PM
> To: 'John Matijevic'; 'Jung, Jin'; 'MADMAN'
> Cc: 'SHARMA,MOHIT (HP-Germany,ex1)'; ccielab@groupstudy.com
> Subject: RE: Switchin Basics
>
>
> Hi John,
> I think there is something missed as per the following output from
> CAT3550
>
> Down-Backbone(config)#vlan 1
> Down-Backbone(config-vlan)#?
> VLAN configuration commands:
> are Maximumn number of All Route Explorer hops
> for this VLAN
> (or
> zero if none specified)
> backupcrf Backup CRF mode of the VLAN
> bridge Bridging characteristics of the VLAN
> exit Apply changes, bump revision number, and exit mode
> media Media type of the VLAN
> mtu VLAN Maximum Transmission Unit
> name Ascii name of the VLAN
> no Negate a command or set its defaults
> parent ID number of the Parent VLAN of FDDI or Token
> Ring type
> VLANs
> private-vlan Configure a private VLAN
> remote-span Configure as Remote SPAN VLAN
> ring Ring number of FDDI or Token Ring type VLANs
> said IEEE 802.10 SAID
> shutdown Shutdown VLAN switching
> state Operational state of the VLAN
> ste Maximumn number of Spanning Tree Explorer
> hops for this
> VLAN
> (or zero if none specified)
> stp Spanning tree characteristics of the VLAN
> tb-vlan1 ID number of the first translational VLAN for
> this VLAN
> (or
> zero if none)
>
> Down-Backbone(config-vlan)#sh
> Command is only allowed on VLAN 2..1001.
> Down-Backbone(config-vlan)#
>
>
>
> Note: shutdown command under vlan 1 database means VLAN switching (L2)
> but if you put shutdown under interface vlan 1 , it is simply working
> and you just will not be able to telnet to the switch by the
> IP of vlan
> 1,
> That is all,
> I hope I was clear
>
> Regards
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of
> John Matijevic
> Sent: Thursday, July 03, 2003 9:56 PM
> To: Jung, Jin; 'MADMAN'
> Cc: SHARMA,MOHIT (HP-Germany,ex1); ccielab@groupstudy.com
> Subject: Re: Switchin Basics
>
> cat1(config)#vlan 1
> cat1(config-vlan)#shut
> Command is only allowed on VLAN 2..1001.
> cat1(config-vlan)#
>
> Hello Team,
>
> The above is what I was illustrating.
>
> sincerely,
>
> Matijevic
>
> ----- Original Message -----
> From: "Jung, Jin" <jin.jung@lmco.com>
> To: "'MADMAN'" <dave@interprise.com>; "John Matijevic"
> <matijevi@bellsouth.net>
> Cc: "SHARMA,MOHIT (HP-Germany,ex1)" <mohit.sharma@hp.com>;
> <ccielab@groupstudy.com>
> Sent: Thursday, July 03, 2003 2:03 PM
> Subject: RE: Switchin Basics
>
>
> > I agree, Sure you can shut down VLAN1, why not..
> >
> >
> > I do this for 2924, 6500, ...
> >
> > And for 3550, if you have IP address one the VLAN interface and you
> can
> > access the switch via telnet, and Yes that is the management VLAN,
> >
> > You do not have to put command "management" under VLAN
> interface, like
> some
> > older switches.
> >
> >
> >
> > Jin jung...
> >
> >
> > -----Original Message-----
> > From: MADMAN [mailto:dave@interprise.com]
> > Sent: Thursday, July 03, 2003 1:31 PM
> > To: John Matijevic
> > Cc: SHARMA,MOHIT (HP-Germany,ex1); ccielab@groupstudy.com
> > Subject: Re: Switchin Basics
> >
> >
> > John Matijevic wrote:
> > > 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
> >
> > OK I'll accept your challenge since I know I can shut
> down VLAN 1,
> it
> > is how I access a 3512XL in the lab!!!
> >
> > interface VLAN1
> > no ip address
> > no ip directed-broadcast
> > shutdown
> > !
> > interface VLAN64
> > ip address 172.28.64.4 255.255.255.0
> > no ip directed-broadcast
> > ip nat outside
> > !
> > VLAN 64 is the inband management VLAN.
> >
> > Dave
> >
> >
> > > ----- 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/c3550/1
> 2113ea1/35
> > >>>50s
> > >>>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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> > >>>
> >
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> > --
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> > CCIE# 2016
> > Sr. Network Engineer
> > Qwest Communications
> > 612-664-3367
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