Re: VLAN Troubles

[Aled Morris <aledm () qix co uk>]

"show vlan" will tell you if the VLAN has been created on the Cisco.

The config to create it is easy (and necessary):

!
vlan 25
 name Radiology
!

Aled


On 6 March 2012 17:55, Jason Baugher <jason () thebaughers com> wrote:

> +1 on show interface trunk, which will probably tell you that only vlan 1
> is allowed on your trunk interfaces.
>
> I find it easy to forget that a Cisco switch will not pass tagged traffic
> for a vlan if that vlan isn't created on the switch. Even if you do
> something like "switchport trunk allow vlan 12" on a trunk port, it won't
> create the vlan on the switch unless you specifically create it or you add
> it to an access port like "switchport access vlan 12".
>
> Jason
>
>
>
> On 3/6/2012 11:04 AM, Greg T. Grimes wrote:
>
> > On the cisco, do a 'show interface trunk'.  Be sure that it thinks it's
> > supposed to pass those VLANs.  Make sure "Vlans allowed on trunk" includes
> > the VLAN.  Same for "Vlans allowed and active in management domain".  Then
> > the important one is "Vlans in spanning tree forwarding state and not
> > pruned".  If it's not there then it's being pruned.  Also on your Dell
> > uplink add the following line to the uplink port:
> >
> > switchport access vlan add 12,22
> >
> > See what that does for you.
> >
> > On Tue, 6 Mar 2012, Alan Bryant wrote:
> >
> >  I hope everyone is having a better workday so far than I am.
> > > I am trying to clean up the network for the Hospital I work for, and
> > > part of that is creating two VLAN's for two separate subnets on our
> > > network. Before, it was not separated by VLANs. We are also replacing
> > > our aged Juniper firewall with an ASA.
> > >
> > > I'm very new to VLAN's, so I am hoping this is something simple that
> > > you guys can help me out with.
> > >
> > > We have two switches that do not seem to be passing VLAN traffic. The
> > > two switches are a Dell Powerconnect 5324 & a Cisco 3560G. The Cisco
> > > switch appears to be functioning fine, but the Dell switch is only
> > > passing traffic to the Cisco that is on the default untagged VLAN1.
> > > Our second VLAN is not getting passed to the Cisco at all, I am not
> > > seeing any packets tagged with the particular vlan in Wireshark.
> > >
> > > I have Port 1 on the Dell switch connected to port 29 on the Cisco
> > > switch, and port 1 on the Cisco switch connected to the ASA.
> > >
> > > I have the following config on the relevant ports on the Cisco switch:
> > >
> > > interface GigabitEthernet0/1
> > > description ASA 5505
> > > switchport trunk encapsulation dot1q
> > > switchport mode trunk
> > >
> > > interface GigabitEthernet0/29
> > > description Radiology Switch
> > > switchport trunk encapsulation dot1q
> > > switchport mode trunk
> > >
> > > Here is the config for the Dell switch:
> > >
> > > interface ethernet g1
> > > speed 1000
> > > duplex full
> > > exit
> > > interface ethernet g2
> > > speed 1000
> > > duplex full
> > > exit
> > > interface ethernet g3
> > > speed 1000
> > > duplex full
> > > exit
> > > interface ethernet g4
> > > speed 1000
> > > duplex full
> > > exit
> > > interface ethernet g5
> > > speed 1000
> > > duplex full
> > > exit
> > > interface ethernet g7
> > > speed 1000
> > > duplex full
> > > exit
> > > interface ethernet g9
> > > speed 1000
> > > duplex full
> > > exit
> > > interface ethernet g10
> > > speed 1000
> > > duplex full
> > > exit
> > > interface ethernet g12
> > > speed 1000
> > > duplex full
> > > exit
> > > interface ethernet g14
> > > speed 1000
> > > duplex full
> > > exit
> > > interface ethernet g15
> > > speed 1000
> > > duplex full
> > > exit
> > > port jumbo-frame
> > > interface ethernet g1
> > > switchport mode trunk
> > > exit
> > > interface ethernet g24
> > > switchport mode trunk
> > > exit
> > > vlan database
> > > vlan 12,22
> > > exit
> > > interface range ethernet g(2,4,7,12,14-15)
> > > switchport access vlan 12
> > > exit
> > > interface vlan 12
> > > name Radiology
> > > exit
> > > interface vlan 22
> > > name Guest
> > > exit
> > > interface vlan 1
> > > exit
> > >
> > > Anyone have any ideas or pointers? Is there more information that I
> > > need to provide? Vlan1 works just fine, of course. It is Vlan 12 that
> > > is not working. Everything on the Dell switch is communicating with
> > > each other just fine on the same subnet.