Re: [Lsr] Publication has been requested for draft-ietf-lsr-ip-flexalgo-06

2022-05-18 Thread Les Ginsberg (ginsberg)
– especially in the forwarding plane – and would not be my first choice as a solution. ?? Les From: Lsr On Behalf Of Robert Raszuk Sent: Tuesday, May 17, 2022 10:58 AM To: Peter Psenak (ppsenak) Cc: lsr Subject: Re: [Lsr] Publication has been requested for draft-ietf-lsr-ip-flexalgo-06 Hi Peter

Re: [Lsr] Publication has been requested for draft-ietf-lsr-ip-flexalgo-06

2022-05-18 Thread Peter Psenak
Robert. On 18/05/2022 13:18, Robert Raszuk wrote: Peter, This was not my question ... Section 10 of soon to be published RFC clearly states that *"IGP restoration will be fast and additional protection mechanisms will not be required." * We can remove that sentence if you don't like it.

Re: [Lsr] Publication has been requested for draft-ietf-lsr-ip-flexalgo-06

2022-05-18 Thread Robert Raszuk
Peter, This was not my question ... Section 10 of soon to be published RFC clearly states that *"IGP restoration will be fast and additional protection mechanisms will not be required." * Those "additional mechanisms" are listed further like LFA, FRR with all its flavors which of course can be

Re: [Lsr] Publication has been requested for draft-ietf-lsr-ip-flexalgo-06

2022-05-18 Thread Peter Psenak
Robert, On 18/05/2022 10:53, Robert Raszuk wrote: Peter, It is not about someone thinking if this is a good idea or not. It is about practical aspects of real deployments. But ok section 10 of the subject draft says something pretty interesting: /10.  Protection    In many networks where

Re: [Lsr] Publication has been requested for draft-ietf-lsr-ip-flexalgo-06

2022-05-18 Thread Robert Raszuk
Missed it - sorry: s/ control plane CPUs and data plane FIBs / control plane CPUs and data plane FIBs with LFA or R-LFA enabled per topo/ On Wed, May 18, 2022 at 10:53 AM Robert Raszuk wrote: > Peter, > > It is not about someone thinking if this is a good idea or not. It is > about practical

Re: [Lsr] Publication has been requested for draft-ietf-lsr-ip-flexalgo-06

2022-05-18 Thread Robert Raszuk
Peter, It is not about someone thinking if this is a good idea or not. It is about practical aspects of real deployments. But ok section 10 of the subject draft says something pretty interesting: *10. Protection In many networks where IGP Flexible Algorithms are deployed, IGP

Re: [Lsr] Publication has been requested for draft-ietf-lsr-ip-flexalgo-06

2022-05-18 Thread Peter Psenak
Robert, I really do not want to get into fallback between algorithms. If someone really thinks it is a good idea, he can write a separate document and describe the use case and how to do that safely. But please not in the base flex-algo specification. thanks, Peter On 17/05/2022 19:58,

Re: [Lsr] Publication has been requested for draft-ietf-lsr-ip-flexalgo-06

2022-05-17 Thread Robert Raszuk
Hi Peter, Enabling local protection on all nodes in all topologies may also not be the best thing to do (for various reasons). While I agree that general fallback may be fragile, how about limited fallback and only to one special "protection topology" which would have few constraints allowing us

Re: [Lsr] Publication has been requested for draft-ietf-lsr-ip-flexalgo-06

2022-05-17 Thread Peter Psenak
Robert, On 17/05/2022 14:14, Robert Raszuk wrote: Ok cool - thx Peter ! More general question - for any FlexAlgo model (incl. SR): Is fallback between topologies - say during failure of primary one - only allowed on the ingress to the network ? no. Fallback between flex-algos has never

Re: [Lsr] Publication has been requested for draft-ietf-lsr-ip-flexalgo-06

2022-05-17 Thread Robert Raszuk
Ok cool - thx Peter ! More general question - for any FlexAlgo model (incl. SR): Is fallback between topologies - say during failure of primary one - only allowed on the ingress to the network ? If so the repair must be setup on each topology, otherwise repair will be long as it would need to

Re: [Lsr] Publication has been requested for draft-ietf-lsr-ip-flexalgo-06

2022-05-17 Thread Peter Psenak
Hi Robert, On 17/05/2022 12:11, Robert Raszuk wrote: Actually I would like to further clarify if workaround 1 is even doable ... It seems to me that the IP flexalgo paradigm does not have a way for more granular then destination prefix forwarding. that is correct. In IP flex-algo the

Re: [Lsr] Publication has been requested for draft-ietf-lsr-ip-flexalgo-06

2022-05-17 Thread Robert Raszuk
Actually I would like to further clarify if workaround 1 is even doable ... It seems to me that the IP flexalgo paradigm does not have a way for more granular then destination prefix forwarding. So if I have http traffic vs streaming vs voice going to the same load balancer (same dst IP address)