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boundary="_000_BN7PR05MB5699F9DF7504F526608537ABAE6D0BN7PR05MB5699namp_" MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-Network-Message-Id: cbc0e3c1-a47c-4056-0428-08d75345796d X-MS-Exchange-CrossTenant-originalarrivaltime: 17 Oct 2019 21:03:31.0174 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: gRkZkWTzvP55Om/d4FYYHPPkV3I7HDsxBg8iDLK6LD676bZbl6Ukj/vAWUu1YOTl1N7uS2qRIOrSy9gXlhRTnw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN7PR05MB4020 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,1.0.8 definitions=2019-10-17_06:2019-10-17,2019-10-17 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_notspam policy=outbound_spam score=0 priorityscore=1501 lowpriorityscore=0 phishscore=0 suspectscore=0 spamscore=0 impostorscore=0 mlxscore=0 bulkscore=0 adultscore=0 mlxlogscore=999 malwarescore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1908290000 definitions=main-1910170187 Archived-At: Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Oct 2019 21:03:43 -0000 --_000_BN7PR05MB5699F9DF7504F526608537ABAE6D0BN7PR05MB5699namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Pablo, RFC 8200 strongly discourages us from removing the SRH. Therefore, lacking = strong motivation, we should not do so. We agree that the SRH with Segments Left equal to zero is a functional NOOP= . So, there is no functional motivation. This leaves us to search for other= motivations. The following are possibilities: * To conserve bandwidth on downstream links * To make parsing possible on constrained downstream ASICs Neither of these arguments are compelling, Is there another motivation that= I am missing? = Ron Juniper Business Use Only From: Pablo Camarillo (pcamaril) Sent: Thursday, October 17, 2019 5:41 AM To: Ron Bonica ; SPRING WG List Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Section 4= .16 Hi Ron, SRH with SL=3D0 is a functional NOOP but physically present. These flavors = remove the physical instance. Cheers, Pablo. From: Ron Bonica > Date: Wednesday, 16 October 2019 at 02:43 To: "Pablo Camarillo (pcamaril)" >, SPRING WG List > Subject: RE: [spring] draft-ietf-spring-srv6-network-programming: Section 4= .16 Pablo, I have read all three of these responses, but remain unconvinced. The PSP and USP flavors both remove an SRH when the value of Segments Left = is equal to 0. They do not remove the IP header that is extended by the SRH= . The SRH that is removed is functionally an NOOP, because Segments Left is e= qual to 0. So why bother to remove it? = Ron Juniper Business Use Only From: Pablo Camarillo (pcamaril) > Sent: Tuesday, October 15, 2019 12:45 PM To: Ron Bonica >; SPRING WG= List > Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Section 4= .16 Ron, You have already asked that same question a few days ago with the same word= s: https://mailarchive.ietf.org/arch/msg/spring/4_Slu3kkHwduZZPFJJmRUkmoTVo and there have been replies to it detailing the use-cases: https://mailarchive.ietf.org/arch/msg/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c https://mailarchive.ietf.org/arch/msg/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak https://mailarchive.ietf.org/arch/msg/spring/O7Bf7-UqDj4wDu76d3viV7pCSks I guess you might have missed them. Please read the replies. Thanks, Pablo. From: spring > on b= ehalf of Ron Bonica > Date: Monday, 14 October 2019 at 20:45 To: SPRING WG List > Subject: [spring] draft-ietf-spring-srv6-network-programming: Section 4.16 Authors, Lacking the B.INSERT and T.INSERT functions, can you describe a use-case fo= r the PSP and USP flavors of the END, END.X and END.T functions? Ron Juniper Business Use Only --_000_BN7PR05MB5699F9DF7504F526608537ABAE6D0BN7PR05MB5699namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Pablo,

 

RFC 8200 strongly discourages us from removing the S= RH. Therefore, lacking strong motivation, we should not do so.

 

We agree that the SRH with Segments Left equal to ze= ro is a functional NOOP. So, there is no functional motivation. This leaves= us to search for other motivations. The following are possibilities:<= /o:p>

 

  • To conserve bandwidth on downstream links
  • To mak= e parsing possible on constrained downstream ASICs

 

Neither of these arguments are compelling, Is there = another motivation that I am missing?

 

        &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;             =           Ron<= /p>

 

 

 

Juniper Business Use Only

From: Pablo Camarillo (pcamaril) <pcamaril= @cisco.com>
Sent: Thursday, October 17, 2019 5:41 AM
To: Ron Bonica <rbonica@juniper.net>; SPRING WG List <sprin= g@ietf.org>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Se= ction 4.16

 

Hi Ron,

 

SRH with SL=3D0 is a functional NOOP but physically = present. These flavors remove the physical instance.

 

Cheers,

Pablo.

 

From: Ron Bonica <rbonica@juniper.net>
Date: Wednesday, 16 October 2019 at 02:43
To: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>, SPRING WG List <spring@ietf.org>
Subject: RE: [spring] draft-ietf-spring-srv6-network-programming: Se= ction 4.16

 

Pablo,

 

I have read all three of = these responses, but remain unconvinced.

 

The PSP and USP flavors b= oth remove an SRH when the value of Segments Left is equal to 0. They do no= t remove the IP header that is extended by the SRH.

The SRH that is removed i= s functionally an NOOP, because Segments Left is equal to 0. So why bother = to remove it?

 

    &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;Ron

 

 

 

Juniper Business Use Only

From: Pablo Camari= llo (pcamaril) <pcamaril@cisco.com= >
Sent: Tuesday, October 15, 2019 12:45 PM
To: Ron Bonica <rbonica@ju= niper.net>; SPRING WG List <sp= ring@ietf.org>
Subject: Re: [spring] draft-ietf-spring-srv6-network-programming: Se= ction 4.16

 

Ron,

 

You have already asked that same question a few= days ago with the same words:

https://mailarchive.ietf.org/arch/ms= g/spring/4_Slu3kkHwduZZPFJJmRUkmoTVo

 

and there have been replies to it detailing the= use-cases:

https://mailarchive.ietf.org/arch/ms= g/spring/V0ZpjVLSVZxHaBwecXFxqJjlg_c

https://mailarchive.ietf.org/arch/ms= g/spring/WrYzRZC0HKVgBYaYMCQVcTWrfak

https://mailarchive.ietf.org/arch/ms= g/spring/O7Bf7-UqDj4wDu76d3viV7pCSks

 

I guess you might have missed them. Please read= the replies.

 

Thanks,

Pablo.

&nbs= p;

&nbs= p;

From: spring <<= span lang=3D"ES">spring-bounces@ietf.org<= span style=3D"font-size:12.0pt;color:black">> on behalf of Ron Bonica <rbonica=3D40juniper.net@dmarc.ietf.org>
Date: Monday, 14 October 2019 at 20:45
To: SPRING WG List <spring@ietf.= org>
Subject: [spring] draft-ietf-spring-srv6-network-programming: Sectio= n 4.16

 

Authors,

 

Lacking the B.INSERT and= T.INSERT functions, can you describe a use-case for the PSP and USP flavor= s of the END, END.X and END.T functions?

 

    =             &nb= sp;            =             &nb= sp;    Ron

 =

 =

Juniper Business Us= e Only

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