----- Original Message ----- From: "Jeffrey Haas" <[email protected]> To: "t.petch" <[email protected]> Cc: "Russ White" <[email protected]>; "'Susan Hares'" <[email protected]>; <[email protected]>; "'Jeffrey Haas'" <[email protected]>; "'Edward Crabbe'" <[email protected]> Sent: Tuesday, June 17, 2014 2:15 PM Subject: Re: tables was: Re: [i2rs] draft-white-i2rs-use-case-05.txt has been posted
> On Tue, Jun 17, 2014 at 10:11:01AM +0100, t.petch wrote: > > It is B that I am doubtful about. It is fine for BGP or RIP, but I do > > not see it for link state protocols, that is for me, the SPT is not a > > table of routes, backup routes and so on but, well shortest paths. > > > > Do you see an IS-IS, or OSPF, table comparable to the BGP table? > > Without making specific comment on what *should* be present in the model, > there are three classes of clearly (IMO) useful information available from > the IGPs: > > - The LSDB, which provides topology > - The TEDB > - The active route for a given destination at a given node as per SPF > computations. > > The third item is RIB-like and is the usual input to broader router > route-selection of an active path from multiple candidates. > > The third item will probably have tie-in to our RIB models. > > The first two items are places where abstractions in the model may make > sense, but there's also some benefit to simply exposing protocol mechanics > in the models. The difference is "this is a type-X LSA in OSPF" vs. "this > is a link, this is a node, here are how they connect". > > The abstraction is a bit more useful in an I2RS context. > The protocol mechanics are likely to be something that gets a protocol > specific module in the owning Working Group. > > There will be interesting overlaps in the above two, and one of the more > interesting bits of coordination work I2RS will have. Jeff We have just got a netmod-isis draft draft-litkowski-netmod-isis-cfg-00.txt and I look for items of the third type, and at first sight, I do not see them, just as I cannot recall seeing them in SMI models, either standards-based or proprietary (unlike the LSDB). Of course they can be added but .... well, I have said enough about it. Tom Petch > > -- Jeff _______________________________________________ i2rs mailing list [email protected] https://www.ietf.org/mailman/listinfo/i2rs
