[AusNOG] NBN Traffic Classes

[Aftab Siddiqui]

Hi Chris,


> I would also imagine TC-1 is mapped to a priority queue of some kind. It
> would be in the docs regardless.
>

Yes, for AVC/CVC TC-1 frames - PCP value is 5 as mentioned in the NBN docs
which conforms to 802.1p. [TC-2:4 and TC-4:0 (unmarked)]


> Personally I would expect the congestion point to be the CVC in a FTTH /
> FTTB network. Not so sure on the FTTN yet.
>

Yes, Congestion point from RSP perspective is CVC but from NBN's
perspective it isn't (shouldn't be at this point) and as per some old
thread NBN FTTH is only doing 32:1 split therefore 80Mbps/sub is good
enough.

Best Wishes,

*Aftab Siddiqui*


>
>
> On 7 March 2016 at 13:12, Aftab Siddiqui <aftab at eintellegonetworks.com>
> wrote:
>
>> Hi All,
>>
>> Just trying to understand something about NBN Traffic Classes.
>>
>> As per NBN Product Tech Spec document:
>>
>> "TC-4 is implemented as CIR at the CVC, meaning that CVC TC-4 capacity
>> cannot be shared with other CVCs or traffic classes across the NNI."
>> Which make sense, but then why you need TC-1 and TC-2 for a CVC? Is there
>> any use case for that? Probably voice but then what is the impact of using
>> a TC-1 AVC over TC-4 CVC? IMO the current congestion point is last mile
>> only or its a wrong assumption?
>>
>> Anyone would like to share (offlist) if they are using any traffic class
>> other then TC-4 (or generally unmarked) for CVC.
>>
>> Best Wishes,
>>
>> *Aftab Siddiqui*
>>
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>
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