11-30-2005 06:46 AM - edited 03-03-2019 12:58 AM
We created a new IC to our building that I installed two 2950_48 that are stacked together. Off from one of the 2950 is a fiber that runs back to a 3548XL switch for our trunk connection. I configured trunk on both ends and set vlan 2 as our native vlan. However when I look at interface vlan 2 on the 2950_48 it is showing Vlan up and line protocol down. Now here comes the strange part- on the 2950_48, I able to configure each port for different vlan that we have in our infrastructure but only one vlan can be carried over the trunk. None of the other vlan seems to be working at all. The traffic of the working vlan has no problem at all with network communication. The other thing is that I can't get to my 2950s switch for management from telnet or SSH only console works. Obviously because my VLAN 2 is down. Please assist. Thanks.
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11-30-2005 09:12 AM
Hello,
looking at your configurations, I think you need to add the native VLAN statement to the trunk ports on your 3548:
interface GigabitEthernet0/1
switchport trunk encapsulation dot1q
switchport trunk native vlan 2
switchport trunk pruning vlan none
switchport mode trunk
!
interface GigabitEthernet0/2
switchport trunk encapsulation dot1q
switchport trunk native vlan 2
switchport trunk pruning vlan none
switchport mode trunk
If that does not help, can you post the output of ´show vtp status´ of both switches ? When you look at the output, make sure that the VTP version, domain name (case-sensitive) and password match.
Regards,
GP
11-30-2005 08:21 AM
Hello,
can you post the configurations of both switches ? I guess there is something wrong with either your VTP, trunk, or management VLAN configuration, or a combination of the above. Looking at your configs might reveal something...
Regards,
GP
11-30-2005 08:59 AM
Thanks for the prompt response. I pasted the config for both switches. At the end of the switches is the show int vlan 2 output. I was wrong earlier about the output of vlan2 up and line down. Both vlan2 and line is down. Please look at both config I label in the beginning which one is which.
11-30-2005 09:12 AM
Hello,
looking at your configurations, I think you need to add the native VLAN statement to the trunk ports on your 3548:
interface GigabitEthernet0/1
switchport trunk encapsulation dot1q
switchport trunk native vlan 2
switchport trunk pruning vlan none
switchport mode trunk
!
interface GigabitEthernet0/2
switchport trunk encapsulation dot1q
switchport trunk native vlan 2
switchport trunk pruning vlan none
switchport mode trunk
If that does not help, can you post the output of ´show vtp status´ of both switches ? When you look at the output, make sure that the VTP version, domain name (case-sensitive) and password match.
Regards,
GP
11-30-2005 10:26 AM
Could post your show vlan command also to make sure you have created the vlans in the vlan database . thanks..
12-01-2005 10:21 AM
Thanks GP,
The problem was that the 2950_48 switch connected to 3548 was in server mode and the domain was wrong. Thanks for your help.
11-30-2005 08:35 AM
When you look at the 2950 you are looking at the layer 3 SVI if says up/down. Have you looked at your layer 2 vlan assignments to see if those look ok . If you do a show vlan do all your ports look like they are in the correct vlan ? Are they created at all?? What does it look like when do a "show interface trunk" ? You'll have to post the configs for at least the ports that are the trunks and maybe you could post a "show vlan" command from each side also .
11-30-2005 11:44 AM
Can you also post a "show interface trunk", if that command is available to you. Thanks.
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