[c-nsp] trunk over isp's private vlan

[Dan]

I'm a bit confused.  The doc says that trunking is not allowed on a 
l2protocol-tunnel port.  How can I have multiple vlan's going across a 
link if I can't trunk?

Thanks,
Dan.

Jeff Fitzwater wrote:
> The config you have, does not tag any vlan even though you have 
> trunking enabled.  You are sending vlan 509 as native with no 802.1Q 
> taging.
>
> You could either set native to some other vlan or look into  vlan 
> tunneling, which double tags the packet so that it can traverse ISP 
> that may be using your  VLANs .  Is the other end set up for trunking?
>
> It would be best if you looked at the CISCO doc on the Tunneling.  I 
> think the 3550 supports it.  Also if the native vlans are different, 
> and that is your intent, then you must disable CDP and ST or P for 
> that vlan or the link will not come come up.  Look at log for PVST 
> ERRORS.
>
>
> Jeff Fitzwater
> OIT Network Systems
> Princeton University
>
> On Jun 23, 2007, at 2:38 PM, Dan wrote:
>
>> Hello,
>>
>> I need to create a trunk between two of my 3550 switches which are
>> interconnected over my isp's network.  I can establish the trunk but I
>> cannot get any ip information across the trunk.  I have many other
>> trunks setup but this is the only one I have across someone else's
>> network.  Here is my config, its the same for both sides:
>>
>> interface Vlan509
>>  ip address 10.9.9.24 255.255.255.0
>>  ip ospf cost 50
>> end
>>
>> interface FastEthernet0/8
>>  switchport trunk encapsulation dot1q
>>  switchport trunk native vlan 509
>>  switchport trunk allowed vlan 509
>>  switchport mode trunk
>>  no cdp enable
>>  spanning-tree portfast
>> end
>>
>> sh interfaces trunk shows the vlan in spanning tree forwarding state
>>
>> This is a redundant link that I have setup that is why the ospf cost 
>> is 50
>>
>> What could be wrong?
>>
>> Thanks,
>> Dan.
>>
>>
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