VTP questions (multiple VTP servers on same domain)


I read http://www.cisco.com/warp/public/473/21.html#pracex
and http://www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/rel_4_2/config/vlans.htm#xtocid798015
twice and just want to run this by you guys to see if I understood it.

1. If two switches are set as server with VTP Pruning disabled, no
password, empty string as domain name (out of the box config.) whats
there to stop someone to bring up a switch and call him self a master
of the VTP domain with vtp version 2 enabled? (nothing right?)

2. do i understand it correctly that when I make a vlan pruning-
ineligible, it won't be 'learned' by a VTP advertisement even when the
config. revision number is higher, in other words, if I have a switch
with some prune-ineligible vlans defined, it doesn't matter if some
other switch advertises a VTP advertisement with higher config. rev.
number, I won't erase those vlans.

3. what the best way to make sure that only set vlans are 'learned'
via VTP?

4. if I have multiple VTP servers on same l2 network connected via
trunks with different VLANs on each? is that a disaster waiting to
happen?

.

Relevant Pages

  • Re: vlans and cisco 4500s
    ... VTP is not that dangerous if you know what you are doing. ... When you insert a new switch in the network you just have to reset its ... In the 4503s you configure the interface vlans ...
    (comp.dcom.sys.cisco)
  • Re: Not seeing all VLANS
    ... The 2 2960's are not seeing all the VLANs and I can't work out why ... Okay, so first part, is your VTP isn't working. ... and not matching the config rev on the VTP server. ... With the switch in VTP client mode, it won't automake the VLAN into ...
    (comp.dcom.sys.cisco)
  • Re: 802.1q tagging/untagging on Catalyst 2950
    ... this switch will only be available on this switch. ... You will need to configure 'vtp mode server' in order to create vlans for use on other switches. ... Correct me if I am wrong, but would it be possible to use an 802.1q trunk such as the one described here without configuring this switch as a VTP server? ... It was my understanding that VTP simply consolidated the management of the VLANs by allowing you to create VLANs once and have them propagate automatically. ...
    (comp.dcom.sys.cisco)
  • Re: VTP questions (multiple VTP servers on same domain)
    ... VTP doesn't work unless you have a VTP domain name configured. ... VTP pruning has nothing to do with VTP learning or deleting new VLANs. ... switch B connected via switch A does not have any ports with VLAN 20, ...
    (comp.dcom.sys.cisco)
  • Re: probably an easy routing question, so please help
    ... I've just realized that VLANs don't just divide subnets, ... router) I won't need to use a Layer 3 switch at all. ... both /28s are configured on the same Enet port, with proxy ARP enabled. ...
    (comp.dcom.sys.cisco)