Tony – Inline.
From: Tony Li <[email protected]> On Behalf Of Tony Li Sent: Monday, January 24, 2022 10:15 AM To: Les Ginsberg (ginsberg) <[email protected]> Cc: lsr <[email protected]> Subject: Re: [Lsr] New Version Notification for draft-li-lsr-liveness-00.txt Hi Les, Thank you for commenting. I am not enthused about this solution. Full mesh isn’t appealing at scale. But I recognize this as an alternative which some might find useful in some deployments. Is it clear that the full mesh is only at the ABR level? [LES:] Yes I also understand why and find it appropriate that you have introduced discussion of this alternative in LSR. But ultimately – as others have pointed out – this work does not belong in LSR. As soon as the other solutions are withdrawn, I will be happy to go elsewhere. Tho I know not where as the reliance on the IGP will cause all others to disavow this as well. :) Finally, I object to the use of IGP Router Capability advertisements as the vehicle for advertising the availability of the service. There are examples today of applications which monitor the IGP LSDB in order to provide value add – and they often execute on nodes not actively participating in IGP routing. While running such a service on ABRs is certainly one alternative, it is not the only one. I do not want – nor do I find it appropriate – for Router Capability to be used as a form of DNS for such applications. Please find another means to advertise the availability of the service. My precedent is the use Router Capability for advertising FlexAlgo definitions. This is a service being provided by the area and it seems equally relevant. Would you prefer a top level TLV? [LES:] Flex Algo is a routing calculation being performed by the IGPs who also advertise the algorithm specific attributes and algorithm specific forwarding identifiers. I don’t see what you are doing as analogous. Les The service is inexorably tied to the IGP to determine node liveness, so at least monitoring the IGP is a necessity. You’re absolutely correct, that this need not happen directly on ABRs. Certainly another IGP listener could provide this service. Tony
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