Re: [Teas] consideration of 1 VPN to N VNs mapping

[Dhruv Dhody <[e-mail]>]

Hi Kenichi,

I have not looked into it in detail but my understanding of the
classes in the custom qos-profile is that they are about the access
CE-PE link and thus would not lead to the creation of a separate VN
per class.

Even in the example
https://tools.ietf.org/html/rfc8299#section-6.12.3.2 it says how the
100 Mbps on the access link is shared between the 3 classes.

There is an 'end-to-end leaf' that says bandwidth reservation needs to
be done in MPLS network but I did not interpret that it requires
maintaining a separate VN, the consolidated requirements from all
classes can be mapped to a single VN and the QoS is applied at the
edges as per the L3SM YANG.

Anyways, let me get this verified from L3SM experts and come back to you.

Thanks!
Dhruv

On Tue, Aug 4, 2020 at 3:29 PM Ogaki, Kenichi <[e-mail]> wrote:
>
> Hi draft-ietf-teas-te-service-mapping-yang authors,
>
> Could you consider 1 to N mapping for the L3VPN to VN mapping?
>
> As we required some changes to actn-vn-yang before/during 108th meeting, we would like to also discuss an additional requirement to te-service-mapping-yang. Sorry, late for 108th meeting.
>
> If we correctly understand the current definition, only one VN is allowed to be mapped to a VPN as described in section 4.1 and the model in section 6.1.1.
> However, L3SM expects to differentiate traffic handling per qos-profile which corresponds to key network performance constraints including bandwidth and latency, etc. as described in section 6.12.3.2 of RFC8299.
> As an operator, we believe this means that a qos-profile should be mapped to a VN like this:
>
>    module: ietf-l3sm-te-service-mapping
>      augment /l3vpn-svc:l3vpn-svc/l3vpn-svc:vpn-services
>                /l3vpn-svc:vpn-service:
>        +--rw te-service-mapping!
>           +--rw te-mapping
>              +--rw mapping* [mapping-id]
>                 +--rw mapping-id
>                 +--rw target-class-id?        -> /l3vpn-svc:l3vpn-svc/vpn-profiles
>                 |                                  /valid-provider-identifiers/qos-profile-identifier
>                 |                                  /id
>                 +--rw map-type?               identityref
>                 +--rw availability-type?      identityref
>                 +--rw (te)?
>                    +--:(vn)
>                    |  +--rw vn-ref?           -> /vn:vn/vn-list/vn-id
>                    +--:(te-topo)
>                    |  +--rw vn-topology-id?   te-types:te-topology-id
>                    |  +--rw abstract-node?
>                    |          -> /nw:networks/network/node/node-id
>                    +--:(te-tunnel)
>                       +--rw te-tunnel-list*   te:tunnel-ref
>
>
> Also, in L3SM, qos-profile can be locally defined under site-network-access and also mapped to classification rules defined there as described in 6.12.3.2/6.12.3.1. Then, te-service-mapping-yang should also map a VNAP to the local qos-profile even without vpn-service level mapping like this:
>
>      augment /l3vpn-svc:l3vpn-svc/l3vpn-svc:sites/l3vpn-svc:site
>                /l3vpn-svc:site-network-accesses/l3vpn-svc:site-network-access
>                /l3vpn-svc:service/l3vpn-svc:qos/l3vpn-svc:qos-profile
>                /l3vpn-svc:profile:
>        +--rw (te)?
>           +--:(vn)
>              +--rw vn-ap-ref?
>                      -> /vn:ap/access-point-list/vn-ap/vn-ap-id
>
>      augment /l3vpn-svc:l3vpn-svc/l3vpn-svc:sites/l3vpn-svc:site
>                /l3vpn-svc:site-network-accesses/l3vpn-svc:site-network-access
>                /l3vpn-svc:service/l3vpn-svc:qos/l3vpn-svc:qos-profile/l3vpn-svc:classes
>                /l3vpn-svc:class:
>        +--rw (te)?
>           +--:(vn)
>              +--rw vn-ap-ref?
>                      -> /vn:ap/access-point-list/vn-ap/vn-ap-id
>
> Although we may consider the same requirement to L2SM mapping, from our service objectives, the current definition is enough for now.
>
> How do you think?
>
> Thanks in advance,
> Kenichi
>
> --
> Kenichi Ogaki
> KDDI Corp. | Operation Automation Promotion Dept.
> [phone] | www.kddi.com
>
>
>