You Rock Priscilla!! I am honored to have your advice. Thank you,
Kevin ----- Original Message ----- From: "Priscilla Oppenheimer" To: Sent: Monday, October 21, 2002 5:20 PM Subject: RE: Setting Up VTP Domain [7:55943] > Kevin O'Gilvie wrote: > > > > Dear All, > > > > I have a Cat5k and about 15 Cat29xx . > > All 29xx are connected to the Cat 5, the Cat 5 cpnnects to the > > Pix, Pix > > Connects to the router. > > There are no Vlans in place. > > I would like to enable VTP Domain but I would like to know the > > best way to > > go about thist. > > Some of our 29xx are old some are new, I heard horror stories > > of VTP taking > > down the network. I would like to make the Cat5k my vtp Server > > and all the > > 29xx 's vtp clients. > > I'm more of an expert on real LANs than virtual LANs ;-), so somebody will > correct me if I say anything wrong, but I think your plan sounds fine. You > may want to have one other switch act as a VTP server as a backup. The other > switches should be clients, as you have planned. You should enter VLAN > information on the primary server switch normally and only enter information > on the other switch acting as a VTP server if you know for sure that the > primary server is going to be down for a while. Or, just keep it simple, and > have just one VTP server switch, as you have planned. > > Cisco requires VTP, by the way, so you will have to use it once you start > implementing VLANs. You will probably want to put all the switches in the > same VTP domain since your network is small, which you can easily do by > simply supplying the same domain name for all of the switches. Be very > careful with the spelling so that the domain name is exactly the same on all > the switches. The name is case-sensitive, by the way. > > Most problems with VTP are due to non-systematic updating of VLAN data by > novice network engineers. As mentioned, you should have no more than one or > two switches acting as a server, and you should only make changes on one of > those switches, unless the other one is down and will be down for a while. > > A switch looks at the configuration revision number (CRN) of a VTP > advertisement. If a VTP server or client receives an advertisement where the > received CFN is higher then the current CFN, the switch sends a request to > the originating server for a subset advertisement. The switch then replaces > its VLAN configuration with the contents of the subset advertisement. The > switch floods the original summary advertisement out all trunk ports. A > switch in transparent mode ignores the advertisement and floods it out all > trunk ports. > > Note that when a server or client receives a VTP subset advertisement, the > switch erases its old VLAN configuration and replaces it with the new > information from the advertising server. This behavior can result in > problems. Consider the case where you have configured a switch off-line > before connecting it to a network. Now suppose you have configured the > switch to be a VTP server and that you made many changes as you were > working, resulting in a switch with a higher CFN than exists in the running > network. When you connect the new switch to the network, its VLAN > configuration replaces that of all the switches in the network. VTP does not > add to existing configurations; it replaces them. So, you may have just > wiped out numerous VLANs that already existed. Any ports that were in the > deleted VLANs are now disabled. The network becomes unusable at this point! > VTP is a powerful tool, but it must be used with care. To avoid problems, be > sure to document the VLAN names and IDs that are in use, using network > management software or an Excel spreadsheet. > > And that's probably way more verbiage than you needed! ;-) But I hope it is > helpful. > > _______________________________ > > Priscilla Oppenheimer > www.troubleshootingnetworks.com > www.priscilla.com > > > > > Your Advice is Greatly appreciated, > > > > Kevin Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=56039&t=55943 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
