VLAN allocation and utilization

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Mar 25th, 2008
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I have been asked to investigate spanning tree on a customer environmant. They are using a colapsed core with two 6509 switches (hybrid mode) connected to aprox 40 access switches of different models.


I need to find out which vlans are assigned to each switch, and if the ports are active. There are aprox 100 VLANs.


Is there an easy way to do this, without logging onto each switch, running "sh vlan brief" and "sh interface status" and correlating the information.


The access switches have http off, and have snmp communities set.

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Collin Clark Tue, 03/25/2008 - 10:01
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Mark-


You should probably check the trunks too :-) When I go into a new client site for an assessment, I usually download and install the trial version of Solarwinds Cirrus. This tool is fantastic. You can find out everything you need (IOS version, running config, vlans, trunks, etc) by setting up a script then running it against all devices. You can have everything you need in under an hour. You'll still have to parse through the info, but you'll save a ton of time by not having to telnet into every switch. There are some build-in reports that will give you what you need as well, so check them out if you decide to try it out.


HTH

mark.j.hodge Wed, 03/26/2008 - 09:05
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I was looking for a tool, and tried Cirrus. Looks good, but unfortunately some of the devices are so old that they do not support the necessary MIBs. So I have resourted to the old, tedious manual approach.

Collin Clark Wed, 03/26/2008 - 09:37
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If you use SecureCRT, you could use VBScripts. Let me know and I can send you some examples.

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