Re: [Teas] Structure of draft-ietf-mpls-static-yang
"Tarek Saad (tsaad)" <tsaad@cisco.com> Wed, 14 November 2018 14:24 UTC
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From: "Tarek Saad (tsaad)" <tsaad@cisco.com>
To: tom petch <ietfc@btconnect.com>, mpls <mpls@ietf.org>, "teas@ietf.org" <teas@ietf.org>, "draft-ietf-ospf-yang@ietf.org" <draft-ietf-ospf-yang@ietf.org>
CC: "draft-ietf-mpls-base-yang@ietf.org" <draft-ietf-mpls-base-yang@ietf.org>
Thread-Topic: Structure of draft-ietf-mpls-static-yang
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Date: Wed, 14 Nov 2018 14:24:24 +0000
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Subject: Re: [Teas] Structure of draft-ietf-mpls-static-yang
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+ draft-ietf-ospf-yang authors + teas alias to comment on the utility of TE router-ID in the OSPF YANG model for other non-MPLS technologies too. Hi Tom, Inline.. -----Original Message----- From: tom petch <ietfc@btconnect.com> Date: Tuesday, November 13, 2018 at 12:19 PM To: Tarek Saad <tsaad@cisco.com>, mpls <mpls@ietf.org> Cc: "draft-ietf-mpls-base-yang@ietf.org" <draft-ietf-mpls-base-yang@ietf.org> Subject: Re: Structure of draft-ietf-mpls-static-yang ----- Original Message ----- From: "Tarek Saad (tsaad)" <tsaad@cisco.com> Sent: Tuesday, November 13, 2018 4:31 PM > Hi Tom, > > Thanks. To me, RIP/OSPF/PIM/BGP are all control plane protocols and would think should exist below /routing/control-plane-protocols. > MPLS on the contrary is a forwarding augmentation to existing V4/V6 routing table(s) (which are already defined at path /routing/ribs/rib/routes/route/next-hop ) - the MPLS augmentation carries additional mpls specific data. > There are signaling control plane protocols specific to exchange MPLS labels (e.g. RSVP-TE, LDP) which I expect will exist at /routing/control-plane-protocols/control-plane-protocol (e.g. draft-ietf-teas-yang-rsvp) Tarek Yes, so BGP is out of line, but that is a problem for another WG. The MPLS quirks are IMHO twofold. Why define an address family? I always think of AFI/SAFI when someone says address family and I do not see MPLS figuring in that context. [TS]: MPLS can augment routes in the V4/V6 AFI routing tables defined in RFC8349. However, there are other type of MPLS routes (cross-connects) that are not associated with an IP prefix or an AFI defined in RFC8349. Examples of such routes can be RSVP-LSP labels/cross-connects, per L2 or L3 VRF de-aggregation labels, etc.).. Such routes will exist in the new MPLS AFI table. Second, what are MPLS and MPLStunnel doing in the Interface Table? Ok, they are a carry over from the MIB but do they have any role here? [TS]: currently, this is enabling MPLS on the specific (sub)set of interfaces and setting minimal set of attributes - e.g. MPLS MTU. I am fishing for some 'when' (or if-feature) statements alongside the 'augment' to make the augment conditional (although perhaps not as many as TEAS created:-). Instinctively I feel there should be something as e.g. OSPF has although accepting your point about MPLS not being a protocol; but then mpls-ldp is a protocol but has no conditionals that I can see. [TS]: I think the assumption was MPLS is a base functionality that most router vendors will support - so we've avoided an if-feature check. However, I can see that some devices may not support MPLS (or may not turn MPLS), so we can look into adding a when or feature check to control augments to external YANG models. For MPLS LDP, yes, I think they can add the same for signaling MPLS. However, I am aware LDP protocol can be used for non-MPLS signaling too (e.g. ICCP) - so the LDP YANG modeling team may need to look at what augments can be controlled/associated with MPLS. At a slight tangent, I see in OSPF and others references such as container mpls { description "OSPF MPLS config state."; container te-rid { if-feature te-rid; ie conditional but not on MPLS per se. [TS]: Yes, although traditionally enabled for MPLS-TE, the TE router-ID can apply to non-MPLS technologies too (e.g. for GMPLS OTN, etc.).. IMO, Ideally this would not need to exist under mpls container.. We may need to raise this with OSPF team. Regards, Tarek Tom Petch > Regards, > Tarek > > -----Original Message----- > From: tom petch <ietfc@btconnect.com> > Date: Tuesday, November 13, 2018 at 7:37 AM > To: Tarek Saad <tsaad@cisco.com>, mpls <mpls@ietf.org> > Cc: "draft-ietf-mpls-base-yang@ietf.org" <draft-ietf-mpls-base-yang@ietf.org> > Subject: Structure of draft-ietf-mpls-static-yang > > I wonder if the IETF has yet worked out how to model routing protocols. > I asked, what is MPLS? Looking at various modules, I see > > RIP > augment /routing/control-plane-protocols/control-plane-protocol: > +--rw rip > +--rw interfaces > > OSPF > augment /routing/control-plane-protocols/control-plane-protocol: > +--rw ospf > +--rw areas > | +--rw area* [area-id] > | +--rw interfaces > > the other IxxxGP > module: ietf-ixxx > augment /routing/ribs/rib/routes/route: > +--ro route-type? enumeration > augment /interfaces/interface: > +--rw clns-mtu? uint16 > augment /routing/control-plane-protocols/:control-plane-protocol: > +--rw ixxx > +--rw enable? boolean {admin-control}? > +--rw system-id? system-id > +--rw area-address* area-address > > BGP > augment "/routing-policy/defined-sets" > module ietf-bgp { > +--rw bgp! > +--rw global > +--rw afi-safis > +--rw afi-safi* [afi-safi-name] > +--rw ipv4-unicast > +--rw ipv6-unicast > +--rw l3vpn-ipv4-unicast > > PIM > module: ietf-pim-base > augment /routing/control-plane-protocols: > +--rw pim! > +--rw address-family* [address-family] > | +--rw address-family identityref > | +--rw <per address family configuration> > +--rw interfaces > +--rw interface* [name] > +--rw name if:interface-ref > +--rw address-family* [address-family] > > MPLS > > module: ietf-mpls > augment /rt:routing: > +--rw mpls > augment /routing/ribs/rib/routes/:route: > +--ro local-label? rt-types:mpls-label > augment > /routing/ribs/rib/routes/route/next-hop/next-hop-options/simple-next-hop > : > .... > identity mpls { base address-family; > > Different! which is right? Perhaps none of them. It is very early days > for routing YANG modules, no RFC, limited experience. I am mindful that > it took several years after the publication of the initial system YANG > modules for the advent of NDMA - a radically different approach - so > perhaps in a few years we will be looking at the routing modules and say > it needs a different approach. Sigh > > Tom Petch > > > >
- Re: [Teas] Structure of draft-ietf-mpls-static-ya… Tarek Saad (tsaad)
- Re: [Teas] Structure of draft-ietf-mpls-static-ya… tom petch