06-25-2007 05:23 PM - edited 03-05-2019 04:57 PM
Hello,
I'm trying to create a trunk across a link that my isp has given to me. I have a 3550 at both ends and I need to move across a couple of vlans.
I have tried this config and the trunk comes up, but I cannot transfer any ip information across it.
This is configured on both ends:
interface FastEthernet0/1
switchport access vlan 509
switchport trunk encapsulation dot1q
switchport trunk native vlan 509
switchport trunk allowed vlan 509
switchport mode trunk
end
Do I need to create a tunnel or something first?
Thanks,
Dan.
06-25-2007 06:26 PM
Do you have a SVI for VLAN 509 at each switch ?
If so, let's see the show ip int brief from each switch as well as show vlan and show trunk
06-25-2007 08:07 PM
switch1#sh ip interface brief
Interface IP-Address OK? Method Status Prot
Vlan509 10.50.9.24 YES manual up up
FastEthernet0/8 unassigned YES unset up up
switch2#sh ip interface brief
Interface IP-Address OK? Method Status Prot
Vlan509 10.50.9.3 YES manual up up
FastEthernet0/2 unassigned YES unset up up
switch1#sh interfaces trunk
Port Mode Encapsulation Status Native vlan
Fa0/8 on 802.1q trunking 509
Port Vlans allowed on trunk
Fa0/8 509
Port Vlans allowed and active in management domain
Fa0/8 509
Port Vlans in spanning tree forwarding state and not pruned
Fa0/8 509
switch2#sh interfaces trunk
Port Mode Encapsulation Status Native vlan
Fa0/2 on 802.1q trunking 509
Port Vlans allowed on trunk
Fa0/2 509
Port Vlans allowed and active in management domain
Fa0/2 509
Port Vlans in spanning tree forwarding state and not pruned
Fa0/2 509
The vlan exists on both switches when i type sh vlan
I have other trunk's setup on these switches to other locations on my own network. The only one that cannot transfer any traffic is the one over the isp link.
06-25-2007 08:24 PM
Have a look at this document.
HTH
Sundar
06-26-2007 07:41 AM
I'm assuming you are unable to ping from site A to site B ?
06-26-2007 08:23 AM
That is correct.
06-26-2007 10:56 AM
Did you verify with the ISP that 509 is the transit VLAN ?
Did you try creating an additional VLAN (say, 510) and make that the L3 VLAN (of course, you will have to allow that VLAN in the trunk as well).
06-27-2007 05:56 AM
Unfortunately I cannot rely on the isp in this situation. Is there a way I can create a tunnel or something of that sort?
06-27-2007 07:34 AM
The ISP supplies the end-to-end connectivity here. If their L2 configuration is not done correctly, you won't be able to establish a L2 or L3 connection between these locations.
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