Switching fabrics in Cisco Router

[piotrjastrzebski]

To whom it may concern,
I am writing to enquire about switching fabrics (clos). I am a student working on my Thesis regarding switching fabrics. I had hard time finding credible information about specific topic and I thought that maybe You could provide me with answer for the following question: what are typical sizes of switching fabrics in practical appliance? I would be grateful for either direct answer or any reference to publication/ website, where I could find answer to that question.

[Joseph W. Doherty]

"Switching fabrics in Cisco Router"; did you mean router or in a switch?

". . . what are typical sizes of switching fabrics in practical appliance?"; could you clarify what you mean by "size"? (Did you mean bandwidth capacity of a switch fabric?)

[piotrjastrzebski]

In any device.
Size- i mean typical in Clos rxmxr. r(nxm) m(rxr), r(mxn).

[Giuseppe Larosa]

Hello @piotrjastrzebski ,

the only reference I have found to CLOS fabric is for the Carrier Grade CRS. ( CRS-1, CRS-3, CRS-X)

Branch routers like ISR have not a CLOS fabric.

This is intended to be used in the core / backbone of service providers and support even multi chassis combinations.

see

https://www.cisco.com/c/en/us/support/routers/crs-3-16-slot-single-shelf-system/model.html

Create an account on Cisco Live so that you can access a presentation like the following

https://www.ciscolive.com/c/dam/r/ciscolive/us/docs/2017/pdf/BRKARC-2027.pdf

In the multi chassis setup some chassis ( one every 8 I tihink  ) is dedicated to fabric interconnect  only.

But also in single shelf setup there is a fabric. (actually multiple fabric linecards)

Hope to help

Giuseppe

[piotrjastrzebski]

Thank you for respond,I've read this presentation but I didn't find what I looking for. I need Clos network topology or size (rxmxr)