Ok. When I bring the ring back up, the switch we have running spanning
tree changes VLAN1 to "blocking" on one port, but the VLAN150 still
shows "forwarding"... and creates a loop on VLAN150. Where do I start?
I'm not sure what to even look for or how to troubleshoot this?
Travis
Microserv
Matt Liotta wrote:
Check and see if you are running PVST, which runs spanning tree on
each VLAN.
-Matt
On Dec 9, 2008, at 7:30 PM, Travis Johnson wrote:
Ok... found the original problem... a few switches did not have the
vlan
setup in the vlan database. So the VLAN is up and working now... but
the
problem is because we have a "ring", we use Spanning Tree to keep from
having a loop in the network. But when we bring up the VLAN, the
spanning-tree does not start blocking the VLAN traffic. It does block
the "normal" VLAN1 traffic (like it always has), but the new VLAN
never
gets "blocked", so it creates a loop around the ring.
Am I missing something? I've checked the settings and can't find
anything that I missed to make it work...
Travis
Microserv
Eric Rogers wrote:
Try a "show interface fastethernet x/y switchport" and see what is
the
status of the port and that trunking VLANs enabled are also trunking
VLANs active.
Eric
From: [EMAIL PROTECTED] [mailto:wireless-
[EMAIL PROTECTED]] On
Behalf Of Travis Johnson
Sent: Tuesday, December 09, 2008 5:17 PM
To: WISPA General List
Subject: Re: [WISPA] Cisco VLAN help
Hi,
By default, when doing the switchport mode trunk, all VLAN's are
allowed
(I even issued the command "switchport trunk allowed vlan all" and it
did not display on the sho conf afterward).
Travis
Microserv
Patrick Shoemaker wrote:
Travis Johnson wrote:
Hi,
I need some Cisco switch VLAN help.
I currently have about 60 Cisco 3500 series switches connected
via the
GBIC ports all in a ring configuration with spanning tree. I am
trying
to setup a VLAN for a customer between two of the FastEthernet
ports so
they can connect their offices. I have port 5 on each switch
setup in
VLAN105 and every GBIC port on all the switches setup as
trunking ports.
There are 17 other cisco switches between these two.
I have this setup between two other offices, but they are
directly
connected to each other, with no other switches in between.
What am I missing?
Travis
Microserv
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Is each trunk port in the path set to forward the VLAN with command:
switchport trunk allowed vlan xxx
A sh int for an example trunk and access port would be handy.
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