[afnog] VLANs on Cisco Catalyst 2950

[Bruce Zamaere]

Pactrick / Mark

Thanks for the prompt replies! Below is the entire running config.
-----------cut here-----
sh run

Building configuration...



Current configuration : 1941 bytes

!

version 12.1

no service pad

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

!

hostname Switch

!

!

ip subnet-zero

!

spanning-tree mode pvst

no spanning-tree optimize bpdu transmission

spanning-tree extend system-id

!

!

interface FastEthernet0/1

 switchport access vlan 101

 switchport mode access

 no ip address

!

interface FastEthernet0/2

 switchport access vlan 102

 switchport mode access

 no ip address

!

interface FastEthernet0/3

 switchport access vlan 103

 switchport mode access

 no ip address

!

interface FastEthernet0/4

 no ip address

!

interface FastEthernet0/5

 no ip address

!

interface FastEthernet0/6

 no ip address

!

interface FastEthernet0/7

 no ip address

!

interface FastEthernet0/8

 no ip address

!

interface FastEthernet0/9

 no ip address

!

interface FastEthernet0/10

 no ip address

!

interface FastEthernet0/11

 no ip address

!

interface FastEthernet0/12

 no ip address

!

interface FastEthernet0/13

 no ip address

!

interface FastEthernet0/14

 no ip address

!

interface FastEthernet0/15

 no ip address

!

interface FastEthernet0/16

 no ip address

!

interface FastEthernet0/17

 no ip address

!

interface FastEthernet0/18

 no ip address

!

interface FastEthernet0/19

 no ip address

!

interface FastEthernet0/20

 no ip address

!

interface FastEthernet0/21

 no ip address

!

interface FastEthernet0/22

 no ip address

!

interface FastEthernet0/23

 no ip address

!

interface FastEthernet0/24

 switchport trunk allowed vlan 101-103

 switchport mode trunk

 no ip address

!

interface Vlan1

 ip address 192.168.2.1 255.255.255.0

 no ip route-cache

 shutdown

!

interface Vlan101

 ip address 10.1.101.1 255.255.255.0

 no ip route-cache

 shutdown

!

interface Vlan102

 ip address 10.1.102.1 255.255.255.0

 no ip route-cache

 shutdown

!

interface Vlan103

 ip address 10.1.103.1 255.255.255.0

 no ip route-cache

!

ip http server

!

!

line con 0

line vty 0 4

 login

line vty 5 15

 login

!

end
----------cut here------
At the moment I have to host on ports 1 and 24 with IPs on their respective
subnets. I can only ping the switch when the vlan in question is brought up!
Also from the switch I can't ping the host or the interface unless the vlan
is brought up. So if I can only have one vlan up at a time how should my
config / setup change?

I appreciate your assistance guys!

rgds,

Bruce.


On 5/26/06, Patrick Okui <pokui at psg.com> wrote:
>
> On Friday 26 May 2006 10:19, Bruce Zamaere wrote:
> > Guys,
> >
> > I'm having a bit of a problem configuring vlans on a cisco 2950.
> > I'm trying to achieve the following and don't know if I done it
> > correctly.
> <snip>
>
> the entire show running-config would have been more useful as well as
> show vlan
>
> > The interesting part is that the vlan configuration shows all the
> > vlans except vlan1 in shutdown mode. If I bring up a vlan with the
> > no shut command the vlan in question comes up and vlan1
> > automatically shutsdown. Such being the case I can't seem to get
> > more than 1 vlan to be up at a time. Does anyone know why this is
> > the case and how I can get around it?
> <snip>
>
> Well I run into this in Nairobi, two things to check are
> 1. make sure you have assigned an IP address to each vlan
> 2. after that, just do the usual ping tests to see if the vlans are
> working.
>
> Apparently the VLAN which is "not shutdown" is the only one through
> which you can reach the actual switch (via the vlan IP). AND,
> apparently only one of them can be "reachable" at a time. (unless
> there's a no cisco-bs command for this that I don't know of).
>
> If the pings show that the ports are correctly isolated and if you can
> ping/telnet/whatever to the IP of the VLAN which is currently up then
> don't worry about the "administratively down" status of the VLANs.
>
> >
> > regards,
> >
> > Bruce.
>
> --
> patrick
>
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