Hi Sarah,
On 08/08/2020 01:33, Sarah Chen wrote:
Hi, Peter,
The flex-algo draft mentions "Min Unidirectional Link Delay as defined
in [RFC7810 <https://tools.ietf.org/html/rfc7810>]". When reading
RFC7810, I found two Sub-TLVs:
4.1. Unidirectional Link Delay Sub-TLV 4.2. Min/Max Unidirectional Link
Delay Sub-TLV
Could you please clarify which one should be used? If "Min/Max
Unidirectional Link Delay Sub-TLV" is used, will the max delay carried
in the subTLV be ignored?
flex-algo as defined in the draft uses "Min Unidirectional Link Delay",
which is advertised in the "Min/Max Unidirectional Link Delay Sub-TLV".
The fact that the "Min/Max Unidirectional Link Delay Sub-TLV" carries
some other data (e.g. Max delay) is orthogonal to the flex-algo usage.
thanks,
Peter
Thanks,
Sarah
On Fri, Aug 7, 2020 at 8:30 AM <[email protected]
<mailto:[email protected]>> wrote:
Peter,
>> . The existing description in section 5.1 indicate that legacy
encoding (RFC7810 and RFC5305) is used for link attributes. That is
not correct based upon section 11. To avoid ambiguity can an
explicit reference be added for [I-D.ietf-isis-te-app]?
>
>
> well, section 5.1. is correct. The Min Unidirectional Link Delay
and TE Default metric respectively were defined in RFC7810 and
RFC5305. The fact that we advertise them in ASLA does not change
their origin.
Could we please get a clarification in section 5.1 then? The
references there to 7810 and 5305 without any qualification strongly
suggest that the encoding from those RFCs should be used.
>> Could in section 11 be explicit reference to (e)ag, te-metric
and delay link attributes MUST be encoded using ASLA..
>
> Section 11 already says:
>
> Link attribute advertisements that are to be used during Flex-
> Algorithm calculation MUST use the Application Specific Link
> Attribute (ASLA) advertisements defined in
[I-D.ietf-isis-te-app] or
> [I-D.ietf-ospf-te-link-attr-reuse].
>
> I'm not sure what else can we say. Listing the ones we use today
wold be dangerous, because we may define additional ones later and
we want the ASLA to be mandatory for all of them.
You could add a sentence that says:
In particular, the Min Unidirectional Link Delay, TE
Default Metric, Administrative Group, Extended Administrative Group,
Shared Risk Link Group Value TLVs are all to be encoded iin the ASLA
advertisements for use with FlexAlgo.
Please add any I missed.
Regards,
Tony
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