[AusNOG] Running out of VLANs

[Joshua D'Alton]

>From that page:
The Q-in-Q VLAN tag termination feature is simpler than the IEEE 802.1Q
tunneling feature deployed for the Catalyst 6500 series switches or the
Catalyst 3550 and Catalyst 3750 switches. Whereas switches require IEEE
802.1Q tunnels on interfaces to carry double-tagged traffic, routers need
only encapsulate Q-in-Q VLAN tags within another level of 802.1Q tags in
order for the packets to arrive at the correct destination.


On Mon, Dec 16, 2013 at 4:04 PM, Matthew Moyle-Croft <mmc at mmc.com.au> wrote:

> Hi,
> If the platforms support it do q-in-q to the routers.
>
> So, take the dot1q trunk from the carrier, wrap it in an outer vlan and
> push that to the router.  The router then needs to understand how to unpack
> q-in-q.
>
> (Here's _an_ example on the 10k, but I'm sure more than 30sec Googling
> will find what you want.
>
>
> http://www.cisco.com/c/en/us/td/docs/routers/10000/10008/feature/guides/qinq.html)
>
> MMC
>
>
> On 15 Dec 2013, at 7:20 pm, James Mcintosh <james.mcintosh at rocketmail.com>
> wrote:
>
> Hi Noggers,
>
> What are people doing about hitting switch VLAN limits? We terminate a lot
> of Ethernet services from several carriers. Our Cisco switch gear is great
> but limited to 128 spanning tree VLAN sessions and 1,000 VLANs.
>
> We've long since passed the 128 per-VLAN spanning tree limit. We're now
> getting closing in on 1,000 VLANs.
>
> I'm sure there are service providers on list who are much larger than we
> are and have solved this problem.
>
> Would love to hear thoughts on the best approach.
>
> Just to give a bit more detail - we aggregate all our upstream carrier
> circuits on the Cisco switch then trunk the customer VLANs to the
> appropriate router for termination.
>
> -James
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