Hi Peter, Yes I need to allocate a new SRGB, but my index space will be contiguous and I will be able to use the index 51 in each scope.
-----Original Message----- From: Peter Psenak [mailto:[email protected]] Sent: Wednesday, August 26, 2015 09:28 To: LITKOWSKI Stephane SCE/IBNF; Eric C Rosen; Pushpasis Sarkar; SPRING WG Subject: Re: [spring] SRGBs, indexes, and topologies within a domain Hi Stephane, On 8/26/15 01:28 , [email protected] wrote: > Hi Peter, > > As I already pointed to Les, using an offset creates some holes in index > space that we need to manage when extending a block. > > Let's say that we have SRGB [100-199] (to simplify) and you divide your block > in two so you will have topology #1 using [100-149] and topology #2 using > [150-199] using an offset of 50. > Now I need to add a 51th node in my network, I cannot use index 51 because it > will overlap with topology#2 :(, so I will need to skip indexes from 51 to > 100, and restarts my numbering with index 101. This management of holes is > not automated. how is this different to the case where you have two per topology SRGBs of 100-149 and 150-199 and now you need 51st SID? It is exactly the same problem. You need to allocate a new SRGB. thanks, Peter > > Best Regards, > > Stephane > > -----Original Message----- > From: Peter Psenak [mailto:[email protected]] > Sent: Tuesday, August 25, 2015 13:18 > To: LITKOWSKI Stephane SCE/IBNF; Eric C Rosen; Pushpasis Sarkar; > SPRING WG > Subject: Re: [spring] SRGBs, indexes, and topologies within a domain > > Hi Stephane, > > On 8/25/15 12:58 , [email protected] wrote: >> Hi Peter, >> >>>> 1. If a new topology is added by use of the MT features of an IGP, >>>> then a new set of prefix-SIDs must be provisioned. This seems like >>>> a major provisioning task. The alternative would be to have an >>>> SRGB per topology; then when you add a new topology, you only have >>>> one quantity to provision (or one per platform perhaps). I hear >>>> some hand-waving about how easy it is to provision new prefix-SIDs >>>> for every new topology, but ... >> >>> I will keep repeating myself that such provisioning can be made automatic, >>> so the above point is not really convincing to me. >> >> Could you explain how ? Based on past discussions, it does not seem to be so >> easy. > > simply by associating an offset and size from SRGP on a per topology basis. > > Example: > > SRGB 1600-24000 > > I would assume that when you start to assign your SIDs for the default > topology, you would not pick random values, but start from the beginning. So > let' assume you are using 16001 to 16500 for nodes in default topology. > > Now you need to add a new topology. You configure and offset of 2k for it, so > the advertised SIDs for the new topology would start from 18001. > If we assume that the 2k would be a reasonable size for each topology you can > have 4 topologies with 2k SIDs per topology. > > If for whatever reason you run out of the SID space in any topology, you can > configure another offset for those SIDs which do not fit into the existing > range for such topology. > > All of the above is internal to the node and no per topology SRGB > advertisement is required. You advertise unique SID on a per prefix and per > topology basis, but you do not need to configure each SID manually. > Al you need to configure is the single prefix SID and per topology > offset/size. It gives you the same simplicity for configuration as per > topology SRGB, but without the need to advertise SRGB per topology. > > thanks, > Peter >> >> >> Best Regards, >> >> Stephane >> >> >> >> _____________________________________________________________________ >> _ ___________________________________________________ >> >> Ce message et ses pieces jointes peuvent contenir des informations >> confidentielles ou privilegiees et ne doivent donc pas etre diffuses, >> exploites ou copies sans autorisation. Si vous avez recu ce message >> par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les >> pieces jointes. Les messages electroniques etant susceptibles d'alteration, >> Orange decline toute responsabilite si ce message a ete altere, deforme ou >> falsifie. 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