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

[<[e-mail]>]

Hi Jeff,

We have additional updates to put in the draft.
We will publish it as soon as it is done.

Brgds,


From: Jeff Tantsura [mailto:[e-mail]]
Sent: Wednesday, July 24, 2019 13:52
To: Stewart Bryant; [e-mail]; [e-mail]; Francois Clad (fclad)
Subject: 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) <[e-mail]>, 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" <[e-mail]> 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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