Re: [PWE3] [mpls] ELI as a reserved label
Shane Amante <shane@castlepoint.net> Fri, 30 July 2010 15:31 UTC
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From: Shane Amante <shane@castlepoint.net>
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Date: Fri, 30 Jul 2010 17:31:23 +0200
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To: curtis@occnc.com
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Cc: mpls@ietf.org, pwe3@ietf.org
Subject: Re: [PWE3] [mpls] ELI as a reserved label
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Curtis, On Jul 30, 2010, at 14:02 GMT+02:00, Curtis Villamizar wrote: > In message <0DEFA7EF-8DC4-4EF2-ABDF-0404FC32B992@castlepoint.net> > Shane Amante writes: >> On Jul 30, 2010, at 11:06 GMT+02:00, Curtis Villamizar wrote: [--snip--] >>> 3. Providing a means to carry indication of large flow as described >>> in draft-yong-pwe3-enhance-ecmp-lfat-01.txt and >>> draft-yong-pwe3-lfc-fat-pw-01.txt without changing the use of TC >>> in a forwarding LSP label. >> >> I'm unclear how a single, reserved label would be a means of signaling >> a large vs. small flow. How can a single label represent two states >> (large vs. small flow)? > > That's the slightly ugly part. If ELI carries a TTL=0 then it can't > be used to forward and among those that discussed this (in one of the > "hallway sessions" near the registration desk) it was not seen as too > horribly ugly if TC meaned something else in the ELI label stack entry > only. > > Lucy has a different way to do multipath and this is an enabler. If > your LSRs don't use it, then it does no harm as long as the hashed > entropy value is there too. Understood. I would note that in draft-kompella-mpls-entropy-label-01 it is NOT envisioned that there will be a "standalone ELI" in all cases. Specifically, in the case where application labels are in use, (e.g.: 2547 VPN's, 6PE, etc.), the application label itself is intended to serve the purpose of an ELI, indicating that the label that immediately follows the application label is an entropy-label, i.e.: +----------------+ | Tunnel Label | +----------------+ | App. Label | +----------------+ | Entropy Label | +----------------+ In these cases, there wouldn't be a reserved label used for a ELI in the label stack. Thus, I'm not sure you can count on the LFC-bit *only* being set in entropy-labels that are immediately preceded by a reserved ELI label. So, with respect to LFC, IMO it's: a) orthogonal to the discussion of whether or not a reserved label for the ELI is absolutely _required_ or just nice-to-have; and, b) the MPLS WG needs to weigh in with a definitive answer on whether changing the semantics of the MPLS TC is appropriate to accommodate end-users who desire LFC. -shane
- Re: [PWE3] [mpls] ELI as a reserved label Kireeti Kompella
- [PWE3] ELI as a reserved label Curtis Villamizar
- Re: [PWE3] [mpls] ELI as a reserved label Shane Amante
- Re: [PWE3] [mpls] ELI as a reserved label Curtis Villamizar
- Re: [PWE3] [mpls] ELI as a reserved label Shane Amante
- Re: [PWE3] [mpls] ELI as a reserved label Shane Amante
- Re: [PWE3] [mpls] ELI as a reserved label Curtis Villamizar
- Re: [PWE3] [mpls] ELI as a reserved label Curtis Villamizar
- Re: [PWE3] [mpls] ELI as a reserved label Greg Mirsky
- Re: [PWE3] [mpls] ELI as a reserved label John E Drake
- Re: [PWE3] [mpls] ELI as a reserved label Curtis Villamizar
- Re: [PWE3] [mpls] ELI as a reserved label Curtis Villamizar
- Re: [PWE3] [mpls] ELI as a reserved label John E Drake
- Re: [PWE3] [mpls] ELI as a reserved label Curtis Villamizar
- Re: [PWE3] [mpls] ELI as a reserved label John E Drake
- Re: [PWE3] [mpls] ELI as a reserved label Curtis Villamizar
- Re: [PWE3] [mpls] ELI as a reserved label Yong Lucy
- Re: [PWE3] [mpls] ELI as a reserved label David Allan I
- Re: [PWE3] [mpls] ELI as a reserved label John E Drake
- [PWE3] ELI and EL in P2MP (Re: [mpls] ELI as a re… Curtis Villamizar
- Re: [PWE3] [mpls] ELI as a reserved label Curtis Villamizar
- Re: [PWE3] ELI and EL in P2MP (Re: [mpls] ELI as … Curtis Villamizar
- Re: [PWE3] ELI and EL in P2MP (Re: [mpls] ELI as … David Allan I
- Re: [PWE3] [mpls] ELI as a reserved label Kireeti Kompella
- Re: [PWE3] [mpls] ELI as a reserved label Curtis Villamizar
- Re: [PWE3] [mpls] ELI as a reserved label Yong Lucy
- Re: [PWE3] [mpls] ELI as a reserved label John E Drake
- Re: [PWE3] [mpls] ELI as a reserved label John E Drake
- Re: [PWE3] [mpls] ELI as a reserved label Yong Lucy