Hi

I'm trying to configure a 2940 switch to trunk. I just can't get it to work.

On the interface I have added: switchport mode trunk

The default is encap for this switch is dot1q, so there is no need, or ability to add/change the encap mode. Also all vlans are being allowed by default. I still can't get any port to trunk. Need to get G0/1 to trunk, have also tried to trunk f0/6 to the switch in my office. Any suggestions?

Also can't find the command to change the management VLAN. I do not use vlan 1 for management. Can I change the Mang VLAN on this switch?

Thanks!!
Tom

To change the SVI on the switch simply create a new SVI 'interface Vlan345' and then apply an IP address to that interface. Most of the smaller L2 only switches will only allow you to have one active SVI for management at one time so you will most likely find that when you bring up the new management SVI that the old one goes down/down.

In terms of the interface not trunking can you post the exact config from both sides of the trunks and also the output of 'show int trunk' and 'sh vlan' from both switches.

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please post both end configs. If its a cisco on both ends it should be simple.

Thanks for the SVI tip, it works. On other Cisco switches I work on, I've had to use the management command to designate the Mang Vlan.

Currently I have the 2940 switch connected to a 3524XL switch in my office. Trunking still doesn't work. But when I connect the two using access ports assigned to vlan 100, the vlan 100 traffic and the management traffic works fine. Port f0/1 on the 3524 and Port f0/7 on the 2940.

For Trunking I am trying to use port f0/22 on the 3524 and port f0/6 on the 2940. Long term I will be using Port g0/1 for trunking.

Here is the show run for both switches. I have ??? out the descriptions and passwords.

Thanks for your help!!!

CISCO 3524XL


????????#sh ru
Building configuration...

Current configuration:
!
version 12.0
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname ?????????
!
enable secret 5 ???????????????????
enable password ????????????
!
!
!
!
!
!
ip subnet-zero
no ip domain-lookup
!
!
!
interface FastEthernet0/1
switchport access vlan 100
!
interface FastEthernet0/2
switchport access vlan 100
!
interface FastEthernet0/3
switchport access vlan 100
!
interface FastEthernet0/4
switchport access vlan 100
!
interface FastEthernet0/5
switchport access vlan 100
!
interface FastEthernet0/6
switchport access vlan 100
!
interface FastEthernet0/7
switchport access vlan 100
!
interface FastEthernet0/8
switchport access vlan 100
!
interface FastEthernet0/9
switchport access vlan 100
!
interface FastEthernet0/10
switchport access vlan 100
!
interface FastEthernet0/11
switchport access vlan 100
!
interface FastEthernet0/12
switchport access vlan 100
!
interface FastEthernet0/13
switchport access vlan 600
!
interface FastEthernet0/14
switchport access vlan 600
!
interface FastEthernet0/15
switchport access vlan 700
!
interface FastEthernet0/16
switchport access vlan 700
!
interface FastEthernet0/17
switchport access vlan 700
!
interface FastEthernet0/18
switchport access vlan 800
!
interface FastEthernet0/19
!
interface FastEthernet0/20
!
interface FastEthernet0/21
!
interface FastEthernet0/22 THIS IS THE PORT I WAS USING TO TEST TRUNKING VIA CAT-5e Ethernet Crossover cable Green lites both ends
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface FastEthernet0/23
switchport access vlan 100
!
interface FastEthernet0/24
switchport access vlan 100
!
interface GigabitEthernet0/1
description Trunk to MDF
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface GigabitEthernet0/2
switchport trunk encapsulation dot1q
switchport mode trunk
!
interface VLAN1
no ip directed-broadcast
no ip route-cache
shutdown
!
interface VLAN100
description ??????????
ip address 192.168.1.14 255.255.255.0
no ip directed-broadcast
no ip route-cache
!
interface VLAN500
description ?????????
no ip directed-broadcast
no ip route-cache
shutdown
!
interface VLAN600
description ??????????
no ip directed-broadcast
no ip route-cache
shutdown
!
interface VLAN700
description ?????????
no ip directed-broadcast
no ip route-cache
shutdown
!
interface VLAN710
description ?????????
no ip directed-broadcast
no ip route-cache
shutdown
!
interface VLAN910
description ??????????
no ip directed-broadcast
no ip route-cache
shutdown
!
!
line con 0
password ??????????
logging synchronous
login
transport input none
stopbits 1
line vty 0 4
password ?????????
login
line vty 5 15
password ??????????
login
!
end

????????#


Cisco 2940 Switch



2940#sh ru
Building configuration...

Current configuration : 1101 bytes
!
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname ??????????????????
!
enable password ???????????????
!
ip subnet-zero
!
!
spanning-tree mode pvst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
!
!
!
!
interface FastEthernet0/1
description ??????????????????
switchport access vlan 600
!
interface FastEthernet0/2
!
interface FastEthernet0/3
!
interface FastEthernet0/4
!
interface FastEthernet0/5
!
interface FastEthernet0/6 THIS IS THE PORT I WAS USING TO TEST TRUNKING VIA CAT-5e Ethernet Crossover cable Green lites both ends
switchport mode trunk
!
interface FastEthernet0/7
description ????????????????????
switchport access vlan 100
!
interface FastEthernet0/8
description ???????????????????
switchport access vlan 100
!
interface FastEthernet0/9
!
interface GigabitEthernet0/1
switchport mode trunk
!
interface Vlan1
no ip address
no ip route-cache
shutdown
!
interface Vlan100
description ???????????
ip address 192.168.1.55 255.255.255.0
no ip route-cache
!
ip http server
!
line con 0
password ????????
login
line vty 0 4
password ????????
login
line vty 5 15
password ????????
login
!
!
end

2940#

type sh int trunk also sh int fa0/16 switchport and sh int FastEthernet0/22.

_________________
"I will prepare and some day my chance will come." - Abraham Lincoln
http://danielhertzberg.wordpress.com - I blog about networks!

The question becomes what is doing the routing for this seeing that both of these switches are layer 2 only ? You will never be able to talk between subnets without a Layer 3 routing device. Those switches only need a address to manage them and for no other reason . If you do a show vlan do all the L2 vlans show up as active on both switches? You can get rid of all those "interface vlan XX " entries except vlan 100 , on the 3500 the rest serve no purpose. A quick guess would be you did not create the L2 vlans on the 3500.


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@ Vipergg. I think you may be over thinking this. Yes they are both Layer 2 switches. But they are attached to a larger working network with multiple active VLAN's, a core layer 3 switch and a router. My management vlan issue has been solved by an earlier post. The current issue is I just can't get the 2940 to trunk. This should work locally in my office when connected to switch there and on the core switch, which is the ultimate plan. There must be a command I'm missing or doing wrong here.

I will post the show interface results as requested later today.

Thanks for everyone's help.

PS what does "Report this post" mean?