[Detnet-dp-dt] quick notes from 1/31/17 call

[Jouni Korhonen <[e-mail]>]

Present: Jouni, Loa, Norm, Balazs, Janos, Tal and David.

See the attached slideset that was used as the basis during the call.
The MPLS-based PWE encaps has matured, except for: 1) fine grained CoS (i.e., 802.1 has discussed finer granularity of CoS basically to a flow level. The flow identification mechanism in .1CB, .1Qci et al allows this), and 2) PW CW SN width. We have discussed using 28 bits but that might cause issues when interworking with systems that only understand 16 bits (HSR and PRP as an examples). 
The CoS part and whether TC bits are copied between layers is still to be discussed further.
IP PSN seems OK. The questions on the slides were discussed:
- PW labels are still good to have. It makes the stack/implementation more streamlined between MPLS and IP PSNs. Also PW labels make PW switching way easier e.g., in a case of replication/elimination.
- In a case of IP PSN each PW will have their own “tunnel” between T-/S-PEs. That means e.g., a PW between A and B will have different src/dst addresses than a PW between B and D. This makes pinned down paths easier to realize using IP PSN.

Norm asks for the cases where DetNet interworks with e.g. 802.1TSN. Would there be a way to regenerate MAC addresses if those are not transported over DetNet (this is for the case where the L2 is just so bug that interconnect does not make sense). Discussion.. Jouni commented that it is not in current document’s scope. Could be worked in parallel once the encaps for DetNet DP mature a bit.

Loa comments that EXP bits in an MPLS labels should use TC instead (Traffic Class), see RFC5462.

Jouni commented that we now start to have enough material to produce a draft of a draft. Expect the first version next week.

Quick discussion on 1588 PTP in DetNet. 1588 packets should not be replicated. Actually using DetNet encapsulation for them is not really a good idea. Tal will educate us more on that next time.

Action points:
Tal will produce a slideset regarding his thoughts/concerns on 1588 transport in DetNet.

Next call: 2/7/17 10PM PDT


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Jouni Korhonen, Broadcom Ltd.
M: [phone]