[c-nsp] Layer 2 local switching for QinQ circuits

[Rolf Mendelsohn]

Hi David,

Sorry, I missed the fact that this was a 7200.

Either use a 3550 (or better) to remove the outer tag before passing to the 
router, or play IOS roulette on the 7200 ;>).

I suspect that in 12.3.latest or 12.4.latest this might work, but I haven't 
tried it myself.

If you want to push a lot of traffic & Multicast etc. then I would stay away 
from a software solution like PWE etc.

Bridging etc. will work within the local router, but then you need to take a 
crossover from one port to another :>).

cheers
/rolf

On Monday 21 May 2007 13:30:40 David Freedman wrote:
> Rolf Mendelsohn wrote:
> > Hi Guys,
> >
> > Worst case (slightly temporary) solution would be to carefully configure
> > an exit for the QinQ domain into the 802.1q domain and put a crossover
> > cable from one port to another.
>
> How would you do this?
> Its an 72xx NPE-G1 not a switch so can only rely on lconnect (not
> working) or bridging (reluctant to try)
>
> I've seen suggestion of l2tpv3 PWE over loopbacks to try this but have
> never managed to get this to work (and suspect it shouldn't!)
>
> Dave.
>
> > Unless of course you have a big overlap of regular vlan's.
> >
> > cheers
> > /rolf
> >
> > On Monday 21 May 2007 10:31:17 David Freedman wrote:
> >> Bridging was also suggested, but I dont think this would be suitable
> >> since we are talking about a couple of 100 Megs of traffic with lots of
> >> multicast :)
> >>
> >> Does anybody know what kind of performance gain provided by using l2
> >> local switching over bridging?
> >>
> >> I can't find much documentation on this, I'm assuming that because
> >> l2 local switching was developed with CEF in mind it should have bad
> >> things about it, but I could be wrong...
> >>
> >> Dave.
> >>
> >> David Freedman wrote:
> >> > Anybody know when this will be available?
> >> >
> >> > Currently does not work in 12.2(28)SB6 on 72xx
> >> >
> >> > !
> >> > int g0/3.28100
> >> >   encaps dot1q 28 second-dot1q 100
> >> > !
> >> > int g0/3.28150
> >> >   encaps dot1q 28 second-dot1q 150
> >> > !
> >> >
> >> > (config)#connect foo Gi0/3.28100 Gi0/3.28150
> >> > QinQ not supported on GigabitEthernet0/3.28100
> >> > %CONN: invalid segment 1
> >> > %CONN: Invalid Command
> >> >
> >> > Many thanks
> >> >
> >> > David Freedman
> >> >
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