[AusNOG] Cheap Q-in-Q Switch Recommendations

[Sam Silvester]

Another thing to consider is that it's not always necessary to remove the
'outer' tag in order to access the inner tag - in fact, doing so may
simplify things.

Quite a few platforms let you create subinterfaces and directly address
both tags e.g:

interface TenGigabitEthernet0/2/0.1234
 description --- Site X VLAN Y ---
 encapsulation dot1Q 12 second-dot1q 34
 ip address (etc)
!

As previously mentioned, the ME3600X / ME 3800X are interesting platforms,
and the software has come a long way since the initial releases which left
quite a bit to be desired.

Sam




On Wed, Jul 31, 2013 at 9:16 AM, Reuben Farrelly <reuben-ausnog at reub.net>wrote:

> You may want to look at a device like the Cisco ME3600X switch, which will
> give you lots of knobs and options to handle this sort of traffic, either
> terminating double-tagged sessions, rewriting the dot1q tags, vlan
> significance per port etc.
>
> They aren't overly expensive and would definitely be recommended over a
> setup involving fudging around with floor/access switching products that
> weren't really designed to do this sort of thing..
>
> Reuben
>
>
>
> On 31/07/2013 9:22 AM, James Mcintosh wrote:
>
>> Mark,
>>
>> That's pretty close to my scenario.
>>
>> For the purposes of clarity and using a Cisco example let's say I get
>> handed off double tagged VLANs 2, 4 and 6 which each encapsulate two VLANs
>> each e.g. VLANs 21,22,41,41,61 and 62. How can I get to a scenario where I
>> can strip the outer VLAN ID's and trunk the inner VLAN's to my next device
>> e.g:
>>
>> interface GigabitEthernet1/0/43
>>   description egress interface
>>   switchport trunk encapsulation dot1q
>>   switchport trunk allowed vlan 21,22,41,41,61,62
>>   switchport mode trunk
>>   load-interval 30
>> end
>>
>>
>> -James.
>>
>
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