Question

How can I delete a VLAN on a Cisco Switch & Change the password(s)

Asked by: Taramatee

I have a cisco 2924 switch and a cisco 3620 router.

Currently the switch has 2 VLANs set up on it because we had 2 separate networks before. Now we only have one network, and we need to make it so that the switch is able to access servers across all ports on the same VLAN.

I am not a network administrator so my knowledge of this is very limited. I know how to log-in to the devices via telnet, but I don't know enough about the commands to do anything. If you can give me commnds, I should be able to follow along.

SO basically am asking for help on 2 things.

1. First I want to change the passwords on both devices... what commands do I need to type in to do that. I understand these can be encrypted as well.

2. I want to get rid of the secondary VLAN, and set the switch to have all ports on the one VLAN. So I need commands for this as well.

Is possible to have more than one password on the Switch or router? If so, how can I make sure no one has set up secret logins? Is there a command to list all logins?

Thanks

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Asked On
2004-12-23 at 12:30:21ID21252807
Tags

cisco

,

vlan

,

delete

,

switch

Topic

Network Routers

Participating Experts
3
Points
500
Comments
10

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Answers

 

by: TaramateePosted on 2004-12-23 at 12:32:55ID: 12895710

Also... are there any GUI interfaces for administering cisco routers/switches?

 

by: lrmoorePosted on 2004-12-23 at 13:17:37ID: 12896003

Yes, there is a web-based GUI that is enable by default.
Try http://<ip address of switch>
If you get username/PW prompt, use "enable" as username and the enable password

There are several passwords to change
1) enable pw  switch(config)#enable password <new pass>
2) telnet pw switch(config)#line vty 0 15
                  switch(config-if)#password <new pass>
3) enable secret pw  switch(config)#enable secret <new pass>

The only other way to use logins is with AAA enabled and a "local" database. Look for entries like:
 username <username> password <password>


Need to know exactly which version OS is running on the 2924 switch before we can be too specific. Generally, you want to use "show vlan" to see which ports are in which vlans, then you most likely want to make sure all ports are put into VLAN1. Then you can delete the additional vlans in the vlan database:
  switch#vlan data
  switch(vlan)#no vlan 2
  switch(vlan)#exit


 

by: TaramateePosted on 2004-12-23 at 14:04:35ID: 12896255

I managed to log-on to the switch using the HTTP Method. Looks friendly enough...

From what I see there... the software version is 12.0(5)WC2 Enterprise Edition. I should be able to easily manage the ports ports and VLANs via this interface. So that takes care of Part 2 of my request... Thanks

lrmoore > The only other way to use logins is with AAA enabled and a "local" database. Look for entries like: username <username> password <password>"

??? Where should I be looking for these? And I guess I should ask how do I look for these?

I was unable to login to the router through HTTP. Should the router have a GUI as well? If so, How can I enable/disable it? I am sure it is probably disabled for security reasons.

 

by: TaramateePosted on 2004-12-23 at 14:21:12ID: 12896349

I tried changing passwords with the commands you gave but I keep getting errors.

After loggin in my command line looks like this:

My-Router-Name>_

So I tried...
My-Router-Name>Enable Password

Gives me an error... % Invalid input detected at '^' marker.  Which points to "P"

So I tried:
My-Router-Name>Enable  ... which give me:
My-Router-Name#     ... Tried entering Password there.
Gives me an error... % Invalid input detected at '^' marker.  Which points to "a"

I saw someone do this a long time ago and I thought they used a "Set" command

 

by: lrmoorePosted on 2004-12-23 at 14:30:17ID: 12896384

You need to be in priviledged mode first:
  router>enable
  password:
  router#config t
  router(config)#enable password <new password>
  router(config)#

 

by: TaramateePosted on 2004-12-23 at 14:57:33ID: 12896495

thanks, have changed the passwords...
To change the Telnet Password on the router, I had to use:

router(config)#line vty 0 4 ... before enterning the password.


 

by: lrmoorePosted on 2004-12-23 at 15:19:29ID: 12896631

Yes, on a router, line vty 0 4
on a switch, line vty 0 15

 

by: amctechPosted on 2005-09-29 at 05:19:55ID: 14982879

Ty Irmoore your instructions on removing the vlan were a help to me too ..... Your cisco command guruness is legendry ;)

 

by: lrmoorePosted on 2005-09-29 at 21:34:20ID: 14989839

Thanks for the kind words, amctech!
Glad it helped you out.
<8-}

 

by: cmrayerPosted on 2008-07-03 at 08:00:41ID: 21926103

Excellent answers again - as always ;-)

20120131-EE-VQP-002

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