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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="------------4341717550C23625132DAA1B" Content-Language: en-US DMARC-Filter: OpenDMARC Filter v1.3.1 mail.nic.br C7DF618E10E Archived-At: Subject: [ippm] IPPM Metric Registry Concept of Roles X-BeenThere: ippm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: IETF IP Performance Metrics Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 29 Jan 2019 17:38:16 -0000 This is a multi-part message in MIME format. --------------4341717550C23625132DAA1B Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable ** *Hello IPPM WG.* * At NIC.br we are developing a measurement system based on the LMAP framework. Metrics (mainly private ones) are defined following the proposed IPPM metric registry standard. During =C2=A0this effort we identified some doubts regarding the concept of roles in the metric registry: draft-ietf-ippm-metric-registry-17 states at 7.3.6 =E2=80=9C7.3.6. =C2=A0Role =C2=A0=C2=A0In some method of measurements, there may be several roles de= fined =C2=A0=C2=A0e.g. on a one-way packet delay active measurement, there is o= ne =C2=A0=C2=A0measurement agent that generates the packets and the other on= e that =C2=A0=C2=A0receives the packets. =C2=A0This column contains the name of = the role for =C2=A0=C2=A0this particular entry. =C2=A0In the previous example, there s= hould be two =C2=A0=C2=A0entries in the registry, one for each role, so that when a =C2=A0=C2=A0measurement agent is instructed to perform the one way delay = source =C2=A0=C2=A0metric know that it is supposed to generate packets. =C2=A0Th= e values for =C2=A0=C2=A0this field are defined in the reference method of measurement= =2E=E2=80=9D Regarding a) an interest to avoid proliferation of metrics and b) efficient use of the LMAP Framework (announcement of capabilities, scheduling of tasks and reporting of results), shouldn't it be enough and preferred to keep a single metric definition that can be referenced with one of multiple possible roles? For example, an LMAP measurement agent could announce the capability to execute a task producing the OWPD metric, acting either as a client or a server. When scheduling a task the LMAP controller would reference that OWPD metric and pin the role to a specific value (ex: client). And when reporting measurement results that same role would be reported together with the metric URN. It seems the above use cases are solved with a single metric that allows multiple roles. Regarding the metric registry, this perspective interprets the "role" column as a enumeration of all roles applicable to this metric, instead of indicating a single mandatory role. Reinforcing this point of view, the draft-ietf-ippm-initial-registry-09 seem to list all possible roles when describing metrics. Items 4.3.6, 6.3.6, 7.3.6, 8.3.6, 9.3.6. But we do not have any concrete reference on how the final LMAP report would be when reporting data for these metrics.= Could you please comment on the real motivation behind the current draft's choice of creating multiple similar metrics with a single role each? and if this part of the draft is open for discussions and improvements? Thanks in advance, * --=20 NIC.br | Heitor Ganzeli Analista de Projetos/Projects Analyst Centro de Estudos e Pesquisas em Tecnologias de Redes e Opera=C3=A7=C3=B5= es (Ceptro.br) +55 11 5509-3537R.: 4077 INOC 22548*HSG www.nic.br --------------4341717550C23625132DAA1B Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: base64 PGh0bWw+CiAgPGhlYWQ+CgogICAgPG1ldGEgaHR0cC1lcXVpdj0iY29udGVudC10eXBlIiBj b250ZW50PSJ0ZXh0L2h0bWw7IGNoYXJzZXQ9VVRGLTgiPgogIDwvaGVhZD4KICA8Ym9keSBi Z2NvbG9yPSIjRkZGRkZGIiB0ZXh0PSIjMDAwMDAwIj4KICAgIDxwPjxiIHN0eWxlPSJmb250 LXdlaWdodDpub3JtYWw7IgogICAgICAgIGlkPSJkb2NzLWludGVybmFsLWd1aWQtNDI0Mjdj NzktN2ZmZi01Y2FmLTc2NWQtMGZkMWJhMjVjMzUxIj4KICAgICAgICA8cCBkaXI9Imx0ciIK ICAgICAgICAgIHN0eWxlPSJsaW5lLWhlaWdodDoxLjM4O21hcmdpbi10b3A6MHB0O21hcmdp bi1ib3R0b206MHB0OyI+PHNwYW4gc3R5bGU9ImZvbnQtc2l6ZToxMXB0O2ZvbnQtZmFtaWx5 OkFyaWFsO2NvbG9yOiMwMDAwMDA7YmFja2dyb3VuZC1jb2xvcjp0cmFuc3BhcmVudDtmb250 LXdlaWdodDo0MDA7Zm9udC1zdHlsZTpub3JtYWw7Zm9udC12YXJpYW50Om5vcm1hbDt0ZXh0 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