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How to Find Out VLAn Distribution

Posted on 2010-04-03
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Last Modified: 2012-05-09
Hi, we have 11 vlans distributed in our network around 100 switches.I would like to know where are the vlans distributed.Suppose i take VLAn11, i want to know on which switches in Vlan11 configured for ports.

Appreciate if you could please let me know a way of finding out the Vlan distribution in the network.Or is there is a tool which can help me to locate the vlans in the network
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Question by:fshaikh1234
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Expert Comment

by:B H
ID: 29633088
it's probably best that you post the make/model of your switches, and if you know if any services are running on them (like http to configure them, snmp to talk to them, telnet, etc)

knowing the make/model will lead to any existing tool that can crawl the network and figure it out for you - if such a tool for your switches exist

alternatively, you can find a computer which is on vlan11... find out what port it's in... and plug a laptop into the ports next to it, until you find a port that's not on vlan11... assuming dhcp is set up, and assuming vlan11 is controlled by the switch that workstation is plugged into

there's a ton of variables left though

if you trace a route to the outside world from a workstation, follow the host names, it might lead to which switches are doing what
(tracert www.google.com) and look at the first 5 hops or so, depending on your path out

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by:fshaikh1234
ID: 29633336
We ahve different model on switches..like 2950,2960,3750,4006 all cisco switches..We ahve SNMP enabled on our switches and have a network monitoring software called Orion.....is this info helpful..

Is there a way i can find out from Orion the vlans are distrbuted on which switch..??

Or any other tool..
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by:B H
ID: 29633892
i'm not familiar with orion specifically, but this looks real useful:
http://thwack.com/blogs/orion-product-team-blog/archive/2010/01/13/how-to-backup-show-vlan-and-other-show-commands-as-orion-ncm-configs.aspx

from what i've seen of it in a few minutes of google'ing, it looks more than capable of giving you want you want, but unfortunately i can't tell you from experience how to do it, just from the google.
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Author Comment

by:fshaikh1234
ID: 29634565
thanks but not a simple method though, please let me know if any more options avaialble.
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by:moodjbow
ID: 29638523
Why not use the SNMP CISCO-VLAN-MEMBERSHIP-MIB. Since you are accustomed with solarwinds you can user tools like Universal Device Poller or customized template from the Report Writer?
http://www.solarwinds.com/products/orion/features.aspx
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by:joelvp
ID: 29644811
without any tools:
if you have vtp enabled and also vtp pruning, vlans will not be trunked to switches where no user ports are active for a specific vlan. You can then use the following command to show where vlans are trunked from a given switch. eg with vlan 10

sh span vlan 10



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by:fshaikh1234
ID: 29645109
do i have to enter this commnad on the Core switch and it will scan all the switches conenct to it, search for the vlan 10 ports on all 100 switches and also will it slow my network?
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by:joelvp
ID: 29645802
watch out, if you don't have vtp enabled and you are not familiar with it, do not just enable it as it can erase all of your vlans. Of course the show command has no risks.
If you show the config, I can see if vtp is enabled or not
You can start on your core switch and it will show you to which switches directly connecte to the core, vlan 10 is trunked. You will have to seperately visit these switches again to see to which switches it is trunked etc.
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by:fshaikh1234
ID: 29661359
we have VTP enalbled on our network..As i told i have 100 switches in my network and not possible to physically visit or telne tinto all 100 to see the vlans configured on them..Actaully we have 11 vlans total scattered in 100 switches..i need to know for eg: vlan 10 is distributed in what all switches
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fshaikh1234 earned 0 total points
ID: 32693505
i do not need the answer for this anymore
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