Re: [mpls] [sfc] The first nibble issue associated with MPLS encapsulation
Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> Wed, 13 April 2016 12:35 UTC
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>, "tom p." <daedulus@btconnect.com>
Thread-Topic: [mpls] [sfc] The first nibble issue associated with MPLS encapsulation
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Date: Wed, 13 Apr 2016 12:35:11 +0000
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Subject: Re: [mpls] [sfc] The first nibble issue associated with MPLS encapsulation
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I concur with Loa - with a qualifier: AFAIK there is no such thing as an "Early IANA De-allocation" process😉. So we may still have to wait some time until these values become formally available for reuse. My 2c. Thumb typed on my cellphone Regards, Sasha -------- Original Message -------- From: Loa Andersson <loa@pi.nu> Date: Wed, April 13, 2016 3:16 PM +0300 To: mpls@ietf.org, "tom p." <daedulus@btconnect.com> Subject: Re: [mpls] [sfc] The first nibble issue associated with MPLS encapsulation Tom, On 2016-04-13 19:53, t.petch wrote: > ----- Original Message ----- > From: "Eric C Rosen" <erosen@juniper.net> > Sent: Monday, April 11, 2016 3:19 PM > > >> (Removed sfc from the cc-list, this seems out of scope for that WG.) >> >> In designing the BIER header, the BIER WG is free to mandate any value >> it chooses in the first nibble. These values do not come from a > "first >> nibble" registry. >> >> It seems prudent to put a value like 5 for the following reasons: >> >> - If a BIER packet is being parsed by an off-line tool, this is a good >> hint (though just a hint) that the packet is actually a BIER packet; >> >> - If a BIER packet is traveling through an MPLS tunnel, and it > traverses >> a node that does its MPLS load splitting by guessing at the type of > the >> payload, then this is a good hint that the MPLS payload is not IPv4, >> IPv6, or PW. >> >> This strategy does incur a risk. Suppose IPv5 gets designed, >> implemented, and deployed, and folks start to deploy hardware that > does > > Too late; see > > > https://tools.ietf.org/html/draft-boucadair-ip-version-5-8-9-historic-00 Isn't this just in time - if IPv5 is made historic - we can safely use it. /Loa > > Discussion on the int-area list. > > Tom Petch > > > >> MPLS load balancing by inspecting the IPv5 headers of the MPLS >> payloads. If a BIER packet is traversing an MPLS tunnel, > inappropriate >> load splitting may occur if the hardware thinks the payload is IPv5 >> rather than BIER. >> >> This particular risk doesn't seem very significant to me. >> >> Thus I don't think there's anything here that needs fixing. >> > > _______________________________________________ > mpls mailing list > mpls@ietf.org > https://www.ietf.org/mailman/listinfo/mpls > _______________________________________________ mpls mailing list mpls@ietf.org https://www.ietf.org/mailman/listinfo/mpls
- [mpls] The first nibble issue associated with MPL… Xuxiaohu
- Re: [mpls] The first nibble issue associated with… Carlos Pignataro (cpignata)
- Re: [mpls] The first nibble issue associated with… Alexander Vainshtein
- Re: [mpls] The first nibble issue associated with… Greg Mirsky
- Re: [mpls] The first nibble issue associated with… Carlos Pignataro (cpignata)
- Re: [mpls] The first nibble issue associated with… Greg Mirsky
- Re: [mpls] The first nibble issue associated with… Tony Przygienda
- Re: [mpls] The first nibble issue associated with… Alexander Vainshtein
- Re: [mpls] [sfc] The first nibble issue associate… Eric C Rosen
- Re: [mpls] [sfc] The first nibble issue associate… Carlos Pignataro (cpignata)
- Re: [mpls] The first nibble issue associated with… Xuxiaohu
- Re: [mpls] [sfc] The first nibble issue associate… t.petch
- Re: [mpls] [sfc] The first nibble issue associate… Loa Andersson
- Re: [mpls] [sfc] The first nibble issue associate… Alexander Vainshtein
- Re: [mpls] [sfc] The first nibble issue associate… Loa Andersson
- Re: [mpls] [bier] The first nibble issue associat… Eric C Rosen
- Re: [mpls] [sfc] The first nibble issue associate… t.petch
- Re: [mpls] [bier] The first nibble issue associat… Xuxiaohu
- Re: [mpls] [sfc] The first nibble issue associate… Stewart Bryant
- Re: [mpls] [sfc] The first nibble issue associate… Alexander Vainshtein
- Re: [mpls] [sfc] The first nibble issue associate… Loa Andersson
- Re: [mpls] [bier] The first nibble issue associat… Carlos Pignataro (cpignata)
- Re: [mpls] [bier] The first nibble issue associat… Eric C Rosen
- Re: [mpls] [bier] The first nibble issue associat… Alexander Vainshtein
- Re: [mpls] [bier] The first nibble issue associat… Nagendra Kumar Nainar (naikumar)
- Re: [mpls] [Bier] [bier] The first nibble issue a… Loa Andersson
- Re: [mpls] [sfc] The first nibble issue associate… Stewart Bryant
- Re: [mpls] [bier] The first nibble issue associat… Stewart Bryant
- Re: [mpls] [bier] The first nibble issue associat… Stewart Bryant
- Re: [mpls] [Bier] [bier] The first nibble issue a… Stewart Bryant
- Re: [mpls] [bier] The first nibble issue associat… Gregory Mirsky
- Re: [mpls] [bier] The first nibble issue associat… Eric C Rosen
- Re: [mpls] [Bier] [bier] The first nibble issue a… Gregory Mirsky
- Re: [mpls] [Bier] [bier] The first nibble issue a… Loa Andersson
- Re: [mpls] [Bier] [bier] The first nibble issue a… Loa Andersson
- Re: [mpls] [Bier] [bier] The first nibble issue a… Gregory Mirsky
- Re: [mpls] [Bier] [bier] The first nibble issue a… Loa Andersson