Re: [manet-dlep-rg] Mandatory processing TLVs by routers

["Taylor, Rick" <[e-mail]>]

My understanding of mandatory metrics was:

Modems:  MUST advertise support (by giving default values in Initialize message at least) for MDRT,MDRR,CDRT,CDRR, RLQ and Latency (TBD)

Routers:  MUST NOT terminate a connection on receipt of any of these TLVs because they do not 'understand' them.  Whether the router does anything with any of these metrics is the router's business.

Rick Taylor

> -----Original Message-----
> From: [e-mail] [mailto:manet-dlep-rg-
> [e-mail]] On Behalf Of Teco Boot
> Sent: 11 November 2013 18:17
> To: Stan Ratliff
> Cc: DLEP Research Group ([e-mail])
> Subject: Re: [manet-dlep-rg] Mandatory processing TLVs by routers
>
>
> Op 11 nov. 2013, om 18:44 heeft Stan Ratliff (sratliff)
> <[e-mail]> het volgende geschreven:
>
> >
> > On Nov 11, 2013, at 11:00 AM, Teco Boot <[e-mail]> wrote:
> >
> >> Was Re: [manet-dlep-rg] notes DLEP meeting @ IETF88
> >>
> >> I'll split of threads, unless one prefer mail storms without clear
> subjects.
> >>
> >> Op 11 nov. 2013, om 01:55 heeft Stan Ratliff (sratliff)
> <[e-mail]> het volgende geschreven:
> >>
> >>> Item 1 and 2 seem contradictory to me. Metric values are reported via
> TLVs. If a given metric TLV is MANDATORY, then the router MUST process it
> (at least, the router MUST NOT generate an error because it exists).
> >>
> >> This is about:
> >>
> >>>>>>> 1. There are no metric TLVs it is MANDATORY for the Router to
> process.
> >>>>>>> 2. The modem MUST report MDRT, MDRR, CDRT, and CDRR in the Peer
> Discovery message, and make a best effort to accurately report these
> metrics subsequently.
> >>
> >> Item 2 is the first one to read, then item 1 follows. Routers may
> ignore all TLVs, and for example only use Neighbor Up and Neighbor Down.
> >
> >
> > Oh, well.... naturally. When looking at an enumerated list, I *SHOULD
> HAVE* had the general sense to read the second item first.... silly me.
> >
> > On another topic, to say that I disagree with "... Routers may ignore all
> TLVs..." would be an understatement. That's why TLVs are classified as
> MANDATORY or OPTIONAL. Routers (or modems, for that matter) are free to
> ignore OPTIONAL TLVs. But to mandate that something exist in a message,
> but then say "but you can ignore it"? Doesn't make any sense to me.
>
> Why do you care? It is perfectly fine you use these mandatory TLV's. Let
> others do their thing.
>
> Teco
>
>
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