Adding a switch to a VTP domain is fairly easy to do, but done incorrectly, can bring down a whole network. Fortunatly I have not had this happen to me, but I have heard horror stories. There are a few simple steps to take to make sure everything stays running smoothly.
The very first step to complete as soon as you are ready to put a new switch on a network and join it to the domain, is to make sure that the vtp mode is set to transparent. Setting the mode to transparent ensures that the “Configuration Revision” is set to 0. If the switch has been used in a lab and has vlans configured and a configuration revision that is higher than the domain server, even if the switch being added is in client mode, it will overwrite the server and propagate all of it’s vlans across the network.
Continue reading ‘Adding a Cisco switch to a VTP domain’
VTP domains allow you to manage all of your vlans from a central switch. This can be a great tool if you are dealing with a large number of vlans spread out over multiple switches. There are a couple of issues that you must be careful of when you implement a vtp domain, which I will go over shortly.
The first requirement is to make sure that your trunks between switches are up and working.
Continue reading ‘Configuring a VTP domain on Cisco switches’
While trying to setup Vista to connect to new client’s network using a VPN, I kept running into problems and could not get it to connect. I was attempting to connect to a PPTP VPN on a Pix 500 series firewall. The error I kept getting was “Failed to connect to VPN Connection”. I tested the connection with XP and was able to connect without any issues.
Continue reading ‘Vista VPN to Cisco Pix devices’
I have been configuring a basic monitoring solution for a client and stumbled upon this little gem on Cisco’s website. You can find nearly all MIBs for Cisco devices here. I really wish I had found this a couple weeks ago!
http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml
I have finally found/compiled a list of all of the OIDs for the FWSM. This list is fairly long, so it is included as a PDF. This list is for the FWSM 3.2 version of the software.
FWSM OID Info.pdf
Configuring SNMP is usually a relativity mundane process, or at least I thought so until I attempted to do so on a FWSM module in a Catalyst 6500. I came to find out that the typical OIDs for CPU, Memory and Total Connections are not the same as on the ASA/PIX devices. After much digging and use of google.com, I found the following OIDs that work on the FWSM. This is with FWSM 3.3 software, but should also work on FWSM 2.3.
Continue reading ‘FWSM SNMP OID Info’
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