Re: draft-ietf-rtgwg-segment-routing-ti-lfa Table 1 questions

Francois/co-authors,

Thanks for addressing the comments.
Please update and publish the updated draft.

Thanks!

Cheers,
Jeff
On Jul 24, 2019, 1:22 PM -0400, Francois Clad (fclad) <fclad@cisco.com>, wrote:
> Hi Stewart,
>
> Thank you for pointing that out.
>
> The term circuits in the third column refers to bi-directional links. For the sake of clarity, we propose to replace it with “links” and multiply all values in the third column by 2.
>
> It also appears that a glitch occurred when the link/node ratios were reported in this table 1.
>
> Below is the updated table.
>
> +-------------+------------+------------+------------+------------+
> | Network | Nodes | Links |Link-to-Node| SRLG info? |
> | | | | Ratio | |
> +-------------+------------+------------+------------+------------+
> | T1 | 408 | 1330 | 3.26 | Yes |
> +-------------+------------+------------+------------+------------+
> | T2 | 587 | 2166 | 3.69 | No |
> +-------------+------------+------------+------------+------------+
> | T3 | 93 | 802 | 8.62 | Yes |
> +-------------+------------+------------+------------+------------+
> | T4 | 247 | 786 | 3.18 | Yes |
> +-------------+------------+------------+------------+------------+
> | T5 | 34 | 192 | 5.65 | Yes |
> +-------------+------------+------------+------------+------------+
> | T6 | 50 | 156 | 3.12 | No |
> +-------------+------------+------------+------------+------------+
> | T7 | 82 | 586 | 7.15 | No |
> +-------------+------------+------------+------------+------------+
> | T8 | 35 | 82 | 2.34 | Yes |
> +-------------+------------+------------+------------+------------+
> | T9 | 177 | 2742 | 15.49 | Yes |
> +-------------+------------+------------+------------+------------+
>
> Regards,
> Francois
>
> On 22/07/2019 12:00, "Stewart Bryant" <stewart.bryant@gmail.com> wrote:
>
> I would like to understand what Table 1 in
> draft-ietf-rtgwg-segment-routing-ti-lfa is telling us.
>
> It uses the terms links and circuits without distinguishing between the
> two. I could speculate that a circuit is a group of links, but then the
> ratio of nodes to circuits in T1 seems far too low at less than 1:1 in
> network T1.
>
> Then the node to link ratio sounds quite high with fan outs of 84:1 in T2.
>
> Please could you explain what you mean by circuits and links in this table.
>
> What I would like to know is the average ratio of nodes to neighbours,
> and the number of parallel links per neighbour.
>
> Best regards
>
> Stewart
>
>
>
>
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