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Re: [Idr] Question about draft-haas-flowspec-capability-bits-02

Linda Dunbar <ldunbar@futurewei.com> Tue, 22 June 2021 14:15 UTC

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From: Linda Dunbar <ldunbar@futurewei.com>
To: Jeffrey Haas <jhaas@pfrc.org>
CC: "draft-haas-flowspec-capability-bits@ietf.org" <draft-haas-flowspec-capability-bits@ietf.org>, "idr@ietf.org" <idr@ietf.org>
Thread-Topic: [Idr] Question about draft-haas-flowspec-capability-bits-02
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Date: Tue, 22 Jun 2021 14:15:24 +0000
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Subject: Re: [Idr] Question about draft-haas-flowspec-capability-bits-02
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Jeff, 

Based on the TYPE, the receiver can get the "length" field properly. Why it is a problem? 
Type 1 and Type 2 have Length Field. For the Types using "Numeric Operator" or "Bitmask Operator", there is "Length" field as well. 

If I introduce a new type, Type 14, can I just use the format as Type 1 or Type 2? 

Linda

-----Original Message-----
From: Jeffrey Haas <jhaas@pfrc.org> 
Sent: Tuesday, June 22, 2021 7:38 AM
To: Linda Dunbar <ldunbar@futurewei.com>
Cc: draft-haas-flowspec-capability-bits@ietf.org; idr@ietf.org
Subject: Re: [Idr] Question about draft-haas-flowspec-capability-bits-02

Linda,

On Mon, Jun 21, 2021 at 08:51:41PM +0000, Linda Dunbar wrote:
> Jeff,
> 
> One more question:
> Page 3 first paragraph says that "this is due to the lack of a mandatory length element for the components in the NLRI".
> 
> But Section 4.2.1.2 of the RFC8555 Figure 3 shows that the Len can be encoded in the bits. Are you talking about a different "length"?

If you observe the various forms of "length" in RFC 8955 section 4, you'll see that in some cases it's an explicit one octet length (prefixes) mixed with numeric op or bitmask op.  The latter two forms provide for a variable length component type with variable width values.

If I introduce a component 14, how do I know what scheme it uses for length calculations?  

The implementation must KNOW by the spec.  It is not carried in the protocol consistently.  That is the problem.

-- Jeff

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