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

"Stan Ratliff (sratliff)" <sratliff@cisco.com> Mon, 11 November 2013 17:44 UTC

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From: "Stan Ratliff (sratliff)" <sratliff@cisco.com>
To: Teco Boot <teco@inf-net.nl>
Thread-Topic: Mandatory processing TLVs by routers
Thread-Index: AQHO3vclyNdzGtn/5E6Jiv8vLrik7JogseAA
Date: Mon, 11 Nov 2013 17:44:04 +0000
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Cc: "DLEP Research Group (manet-dlep-rg@ietf.org)" <manet-dlep-rg@ietf.org>
Subject: Re: [manet-dlep-rg] Mandatory processing TLVs by routers
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On Nov 11, 2013, at 11:00 AM, Teco Boot <teco@inf-net.nl> 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) <sratliff@cisco.com> 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. 

Stan
 

> 
> Teco
> 
>

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