Re: [Idr] Mail regarding draft-ietf-idr-segment-routing-te-policy
Gurusiddesh Nidasesi <gurusiddesh.nidasesi@ipinfusion.com> Mon, 08 July 2019 12:14 UTC
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From: Gurusiddesh Nidasesi <gurusiddesh.nidasesi@ipinfusion.com>
Date: Mon, 08 Jul 2019 17:44:35 +0530
Message-ID: <CAHhGMfGGkiUiRo5kWTaCNLrEn1NTYAUkt2Y4upngEuf1d2ontw@mail.gmail.com>
To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
Cc: Chaitanya Varma <chaitanya.varma@ipinfusion.com>, "idr@ietf.org" <idr@ietf.org>, Ramanathan Selvamani <ramanathan.selvamani@ipinfusion.com>
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Subject: Re: [Idr] Mail regarding draft-ietf-idr-segment-routing-te-policy
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Hi Ketan, Thank you for the clarification. On Mon, Jul 8, 2019 at 10:45 AM Ketan Talaulikar (ketant) <ketant@cisco.com> wrote: > Hi Gurusiddesh, > > > > The reason for allowing multiple RTs is if the same SR Policy needs to be > delivered to multiple headend routers. It need not be read as a BGP router > having more than one BGP identifier. > > > > Thanks, > > Ketan > > > > *From:* Gurusiddesh Nidasesi <gurusiddesh.nidasesi@ipinfusion.com> > *Sent:* 08 July 2019 10:09 > *To:* Ketan Talaulikar (ketant) <ketant@cisco.com> > *Cc:* Chaitanya Varma <chaitanya.varma@ipinfusion.com>; idr@ietf.org; > Ramanathan Selvamani <ramanathan.selvamani@ipinfusion.com> > *Subject:* Re: [Idr] Mail regarding > draft-ietf-idr-segment-routing-te-policy > > > > Hi Ketan, > > > > Thanks for the response. > > Additionally, we have more queries as follows: > > > > > > The draft says that > > "One or more IPv4 address format route-target extended community > > ([RFC4360 <https://tools.ietf.org/html/rfc4360>]) attached to the SR Policy advertisement and that > > indicates the intended head-end of such SR Policy advertisement." > > > > Here one or more RTs are attached to match specific headend? > > > > " If one or more route-targets are present, then at least one route > target MUST match one of the BGP Identifiers of the receiver in order > for the update to be considered usable." > > Can a BGP peer have more than one BGP identifier? > > > > > > On Wed, Jul 3, 2019 at 7:29 PM Ketan Talaulikar (ketant) <ketant@cisco.com> > wrote: > > Hi Gurusiddesh, > > > > The purpose of the RT is to indicate the specific headend for which the SR > Policy is for. So I am not sure of the scenario where multiple RTs will be > associated with a single update. > > > > Even if it were, I am not sure we normally strip out RTs automatically > without some specific route policy being applied. > > > > Thanks, > > Ketan > > > > *From:* Gurusiddesh Nidasesi <gurusiddesh.nidasesi@ipinfusion.com> > *Sent:* 26 June 2019 12:56 > *To:* Ketan Talaulikar (ketant) <ketant@cisco.com> > *Cc:* Chaitanya Varma <chaitanya.varma@ipinfusion.com>; idr@ietf.org; > Ramanathan Selvamani <ramanathan.selvamani@ipinfusion.com> > *Subject:* Re: [Idr] Mail regarding > draft-ietf-idr-segment-routing-te-policy > > > > Hi Ketan, > > > > We have some more doubts as follows: > > > > "Typically, a controller defines the set of policies and advertise > > them to policy head-end routers (typically ingress routers). The > > policy advertisement uses BGP extensions defined in this document. > > The policy advertisement is, in most but not all of the cases, > > tailored for a specific policy head-end. In this case the > > advertisement may sent on a BGP session to that head-end and not > > propagated any further." > > > > If controller sends multiple unique RTs in the same Update message, > > 1. Once the SR policy reaches the Headend, should we strip down that > particular RT to avoid advertising it further? > > > > Thanks > > Gurusiddesh V N > > > > > > > > > > On Wed, May 8, 2019 at 3:58 PM Ketan Talaulikar (ketant) <ketant@cisco.com> > wrote: > > Hi Gurusiddesh, > > > > Please check inline below > > > > *From:* Gurusiddesh Nidasesi <gurusiddesh.nidasesi@ipinfusion.com> > *Sent:* 07 May 2019 17:11 > *To:* Ketan Talaulikar (ketant) <ketant@cisco.com> > *Cc:* Chaitanya Varma <chaitanya.varma@ipinfusion.com>; idr@ietf.org > *Subject:* Re: [Idr] Mail regarding > draft-ietf-idr-segment-routing-te-policy > > > > Hi Ketan, > > > > Thanks for the quick response. > > Additionally, we have more queries as follows > > > > *"Alternatively, a router (i.e., a BGP egress router) advertises SR* > > * Policies representing paths to itself. In this case, it is possible* > > * to send the policy to each head-end over a BGP session to that head-* > > * end, without requiring any further propagation of the policy."* > > > > How does an egress router advertise SR policies representing paths to > itself? > > *[KT] By setting endpoint to it’s own router-id in the NLRI and setting > the ingress router’s router-id in the router-target extended community.* > > Is it done through BGP configuration or any other trigger? > > *[KT] This would be implementation specific based on the > use-case/workflow.* > > > In the above case how ERO (SID-List) is calculated? > > *[KT] This is again implementation specific. It could be done by some TE > module on the egress BGP router that has topology visibility from the > ingress router to itself. It would be kind of reverse of how a headend > computes a path from itself to an endpoint – this is the endpoint computing > path to itself from some headend.* > > *Thanks,* > > *Ketan* > > > > Regards > > Gurusiddesh V N > > > > On Wed, May 1, 2019 at 7:34 PM Ketan Talaulikar (ketant) <ketant@cisco.com> > wrote: > > Hi Chaitanya, > > > > Please check inline below. > > > > *From:* Idr <idr-bounces@ietf.org> *On Behalf Of *Chaitanya Varma > *Sent:* 30 April 2019 13:34 > *To:* idr@ietf.org > *Cc:* Gurusiddesh Nidasesi <gurusiddesh.nidasesi@ipinfusion.com> > *Subject:* [Idr] Mail regarding draft-ietf-idr-segment-routing-te-policy > > > > Hi, > > > > I have couple of queries from the below draft. > > > > https://tools.ietf.org/html/draft-ietf-idr-segment-routing-te-policy-05 > > > > * “ Typically, a controller defines the set of policies and advertise* > > * them to policy head-end routers (typically ingress routers).” * > > > > How do we communicate SR policies from controller? Is it through BGP-SR > session or PCEP session. > > *[KT] This draft is all about using BGP for signalling SR Policies from a > controller to the head-end routers. So yes (b) below.* > > > > a. If it is through PCEP session what happens if the PCC is non-headend? > > b. If it is through BGP-SR what is the role for PCEP between PCE and PCC? > > *[KT] PCEP is another flavour for instantiation of SR Policies. Yet > another option is using netconf/yang or another method for provisioning. > This draft is about using BGP and PCEP is not required.* > > > > * “ Moreover, one or more route-target SHOULD be attached to the* > > > > * advertisement” *How Route-target should be attached to a SR-NLRI > update? > > *[KT] As Route Target Extended Communities attribute – ref sec 1 of the > draft.* > > > > Is it done through local configuration or picked up based on some dynamic > parameter? > > *[KT] It is done by the controller and may be done via local config – > either along with the SR Policy or route policy or even dynamically based > on the head-end address. This would be implementation specific.* > > > > *Thanks,* > > *Ketan* > > > > Appreciate if you can help here. > > > > > > Regards, > > Chaitanya > > > > > .. > > > > > -- > > Thanks, > > Gurusiddesh V N > > > . > > > > > -- > > Thanks, > > Gurusiddesh V N > > > . > > > > > -- > > Thanks, > > Gurusiddesh V N > > > . > -- Thanks, Gurusiddesh V N -- .
- [Idr] Mail regarding draft-ietf-idr-segment-routi… Chaitanya Varma
- Re: [Idr] Mail regarding draft-ietf-idr-segment-r… Susan Hares
- Re: [Idr] Mail regarding draft-ietf-idr-segment-r… Ketan Talaulikar (ketant)
- Re: [Idr] Mail regarding draft-ietf-idr-segment-r… Gurusiddesh Nidasesi
- Re: [Idr] Mail regarding draft-ietf-idr-segment-r… Ketan Talaulikar (ketant)
- Re: [Idr] Mail regarding draft-ietf-idr-segment-r… Gurusiddesh Nidasesi
- Re: [Idr] Mail regarding draft-ietf-idr-segment-r… Ketan Talaulikar (ketant)
- Re: [Idr] Mail regarding draft-ietf-idr-segment-r… Gurusiddesh Nidasesi
- Re: [Idr] Mail regarding draft-ietf-idr-segment-r… Ketan Talaulikar (ketant)
- Re: [Idr] Mail regarding draft-ietf-idr-segment-r… Gurusiddesh Nidasesi
- Re: [Idr] Mail regarding draft-ietf-idr-segment-r… Nandan Saha
- Re: [Idr] Mail regarding draft-ietf-idr-segment-r… Ketan Talaulikar (ketant)