""Ronnie Higginbotham"" wrote in message
news:[EMAIL PROTECTED]
> Once you take the VTP server down all vlans will basically go down. Which
> will bring down the network with only one VTP server. They will sit there
> and do nothing until the vtp server comes back online.
Is this right? I got to wondering about this, but I don't have enough
equipment to simulate a real network to test end to end.
What I did do was take my two switches, set one as the VTP server, the other
as the client, create some vlans on the server, assigning those vlans to
ports on the client switch, shut down the trunk ports between the two
switches, and watch.
I'm not sure how long I need to wait, but what I am seeing ( or not seeing )
confirms my suspicion - that the assigned ports on the client switch remain
functional.
My trunks are down on the client switch, but that is expected in this setup.
What I am unable to test is whether or not the trunks, over which vlan
information is propagated, will still function in the scenario described.
I suppose you are correct when you say that "all vlans will basically go
down". Certainly, in my simulation, no one on a local switch could get to
the core. What I am wondering is in a dual core switch situation as
described, if servers and services were dual homed to the redundant
switches, if all would remain well. Certainly no new vlans could be added,
but I'm wondering if all else would remain functioning.
some info on the switch
Switch_48#sh vtp stat
VTP Version : 2
Configuration Revision : 2
Maximum VLANs supported locally : 1005
Number of existing VLANs : 12
VTP Operating Mode : Client
Switch_48#sh vlan
VLAN Name Status Ports
---- -------------------------------- --------- ----------------------------
---
1 default active Fa0/4, Fa0/5, Fa0/6, Fa0/7
Fa0/11, Fa0/12, Fa0/13,
Fa0/14
edited for brevety
10 VLAN0010 active Fa0/10
20 VLAN0020 active Fa0/20
30 VLAN0030 active Fa0/8, Fa0/30
40 VLAN0040 active Fa0/40
100 VLAN0100 active Fa0/1
200 VLAN0200 active Fa0/2
300 VLAN0300 active Fa0/3
1002 fddi-default active
1003 trcrf-default active
--M
Switch_48#sh int trunk
Switch_48# ( demonstrating that the trunk is down )
As I said, with two switches, I can't test a real world. However, I suspect
that if the network is properly design, with dual homing of servers and
services, and dual home of the access closets to the core switch, that
things might just be fine.
Can anyone provide info in a more realistic simulation?
>It would be a good
> idea to have two VTP servers so you can take them down one at a time and
> upgrade.
always a good idea.
> I must assume the 2 6509's or for you core routing and the 4006's
> are your closet access switches.
>
> If the other standby 6509 is a client in the same VTP domain as you server
> which I don't see why it would not be, they already that the same VTP
> revision all you have to do is promote the client 6509 to server.
>
> set vtp domain (Domain Name) mode server
>
> Then you have two servers. You must have the 4006's dual ran to both
6509's
> to work...
>
> Ronnie
>
> ""Dave C."" wrote in message
> news:[EMAIL PROTECTED]
> > I have a question regarding VTP.
> >
> > I am working with a network configuration that has dual 6509's as core
> > switches. One is the VTP domain server, the other is a VTP domain
client.
> > All other 4000 switches are defined as client also.
> >
> > I need to take both 6509's down to upgrade the Cat-OS on them, however I
> am
> > concerned about what happens to the other switches when the VTP domain
> > server goes away while the other 6509 is in client mode.
> >
> > I know that I can assign multiple VTP servers to a domain. My original
> > thought is to first make sure that the client 6509 is running the same
VTP
> > revision # as the server 6509. Then I should be able to change the
client
> > 6509 to VTP server mode. Then in theory either server can take over VTP
> > responsibilites, because one will be able to act as the other if the
other
> > one goes away.
> >
> > What I was also wondering, do all VLAN's go disabled if I were to only
> have
> > a single VTP server and shut it down when the rest of the switches are
> > clients? If so, would this happen right away, or after 5 minutes? If I
> take
> > the 6509 server down, it will not be able to tell anyone that a topology
> > change has occurred, but will the clients be looking for the VTP 5
minute
> > updates?
> >
> > If anyone could help clarify this, I would appreciate it.
> >
> > Thanks.
> >
> > Dave C.
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