[c-nsp] Cisco 3750G backplane throughput
Chris Knipe
savage at savage.za.org
Fri Dec 15 07:38:08 EST 2017
3750G-48-TS:
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 52 WS-C3750G-48TS 12.2(40)SE
C3750-ADVIPSERVICESK
# sh platform pm platform-block
interface gid gpn lpn asic hw-i flags sp dp bundle vlan mvid mac so_di
i_vlan
-----------------------------------------------------------------------------
Gi1/0/1 1 1 1 6 3 U 2 2 no 0 0 0 61441 0
Gi1/0/2 2 2 2 6 0 D 0 0 no 0 0 0 61442 0
Gi1/0/3 3 3 3 6 1 D 0 0 no 0 0 0 61443 0
Gi1/0/4 4 4 4 6 2 U 3 2 no 0 0 0 61444 0
Gi1/0/5 5 5 5 5 2 D 0 0 no 0 0 0 61445 0
Gi1/0/6 6 6 6 5 3 D 0 0 no 0 0 0 61446 0
Gi1/0/7 7 7 7 5 0 D 0 0 no 0 0 0 61447 0
Gi1/0/8 8 8 8 5 1 D 0 0 no 0 0 0 61448 0
Gi1/0/9 9 9 9 8 3 D 0 0 no 0 0 0 61449 0
Gi1/0/10 10 10 10 8 0 D 0 0 no 0 0 0 61450 0
Gi1/0/11 11 11 11 8 1 D 0 0 no 0 0 0 61451 0
Gi1/0/12 12 12 12 8 2 D 0 0 no 0 0 0 61452 0
Gi1/0/13 13 13 13 7 2 D 0 0 no 0 0 0 61453 0
Gi1/0/14 14 14 14 7 3 D 0 0 no 0 0 0 61454 0
Gi1/0/15 15 15 15 7 0 D 0 0 no 0 0 0 61455 0
Gi1/0/16 16 16 16 7 1 D 0 0 no 0 0 0 61456 0
Gi1/0/17 17 17 17 4 3 D 0 0 no 0 0 0 61457 0
Gi1/0/18 18 18 18 4 0 D 0 0 no 0 0 0 61458 0
Gi1/0/19 19 19 19 4 1 D 0 0 no 0 0 0 61459 0
Gi1/0/20 20 20 20 4 2 D 0 0 no 0 0 0 61460 0
Gi1/0/21 21 21 21 3 2 D 0 0 no 0 0 0 61461 0
Gi1/0/22 22 22 22 3 3 D 0 0 no 0 0 0 61462 0
Gi1/0/23 23 23 23 3 0 D 0 0 no 0 0 0 61463 0
Gi1/0/24 24 24 24 3 1 D 0 0 no 0 0 0 61464 0
Gi1/0/25 25 25 25 10 3 D 0 0 no 0 0 0 61465 0
Gi1/0/26 26 26 26 10 0 U 2 2 no 0 0 0 61466 0
Gi1/0/27 27 27 27 10 1 D 0 0 no 0 0 0 61467 0
Gi1/0/28 28 28 28 10 2 U 3 2 no 0 0 0 61468 0
Gi1/0/29 29 29 29 9 2 D 0 0 no 0 0 0 61469 0
Gi1/0/30 30 30 30 9 3 D 0 0 no 0 0 0 61470 0
Gi1/0/31 31 31 31 9 0 U 2 2 no 0 0 0 61471 0
Gi1/0/32 32 32 32 9 1 D 0 0 no 0 0 0 61472 0
Gi1/0/33 33 33 33 2 3 U 3 2 no 0 0 0 61473 0
Gi1/0/34 34 34 34 2 0 D 0 0 no 0 0 0 61474 0
Gi1/0/35 35 35 35 2 1 D 0 0 no 0 0 0 61475 0
Gi1/0/36 36 36 36 2 2 U 3 2 no 0 0 0 61476 0
Gi1/0/37 37 37 37 1 2 U 2 2 no 0 0 0 61477 0
Gi1/0/38 38 38 38 1 3 U 3 2 no 0 0 0 61478 0
Gi1/0/39 39 39 39 1 0 U 3 2 no 0 0 0 61479 0
Gi1/0/40 40 40 40 1 1 U 3 2 no 0 0 0 61480 0
Gi1/0/41 41 41 41 12 3 U 1 1 no 0 0 0 61481 0
Gi1/0/42 42 42 42 12 0 U 2 2 no 0 0 0 61482 0
Gi1/0/43 43 43 43 12 1 D 0 0 no 0 0 0 61483 0
Gi1/0/44 44 44 44 12 2 D 0 0 no 0 0 0 61484 0
Gi1/0/45 45 45 45 11 2 D 3 2 no 0 0 0 61485 0
Gi1/0/46 46 46 46 11 3 D 0 0 no 0 0 0 61486 0
Gi1/0/47 47 47 47 11 0 D 3 2 no 0 0 0 61487 0
Gi1/0/48 48 48 48 11 1 U 3 2 no 0 0 0 61488 0
Gi1/0/49 49 49 49 0 3 D 0 0 no 0 0 0 61489 0
Gi1/0/50 50 50 50 0 2 D 0 0 no 0 0 0 61490 0
Gi1/0/51 51 51 51 0 1 D 0 0 no 0 0 0 61491 0
Gi1/0/52 52 52 52 0 0 U 3 2 no 0 0 0 61492 0
On Fri, Dec 15, 2017 at 2:33 PM, Nick Cutting <ncutting at edgetg.com> wrote:
> I just realized that switch output I pasted was a 2960X - the 3560G was
> swapped out by a colleague on Tuesday night !
> It was a 3650G 48TS on Monday.
>
> The command should still work for you though
>
> -----Original Message-----
> From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of
> Nick Cutting
> Sent: Friday, December 15, 2017 7:29 AM
> To: Bryan Holloway <bryan at shout.net>; cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Cisco 3750G backplane throughput
>
> This message originates from outside of your organisation.
>
> Use this command:
>
> sh platform pm platform-block
>
> Should be one ASIC per 24 ports, so a TS should have 1 asic for the normal
> ports and one for the SFP's.
> On a my 48portTS, the SFP's are shared across the two normal ASIC's (48
> copper ports)
>
> I just removed my lab 3560g-24TS so I can't be 100 percent sure on the
> ASIC distribution. I think it had 1 asic for the 24 copper and one for the
> sfp's.
>
> How is your LAG traffic distribution? You need many different flows to
> get much out of a LAG.
> It is harder to get bandwidth out of the LAG than be outputted dropped by
> the ASIC, what I mean is one port in the LAG may hit line rate before the
> others are even using 50 percent of bandwidth.
>
> * 1 52 WS-C2960X-48LPS-L 15.2(2)E6
> sh platform pm platform-block
> interface gid gpn lpn asic
> --------------------------
> Gi1/0/1 1 1 1 0
> Gi1/0/2 2 2 2 0
> Gi1/0/3 3 3 3 0
> Gi1/0/4 4 4 4 0
> Gi1/0/5 5 5 5 0
> Gi1/0/6 6 6 6 0
> Gi1/0/7 7 7 7 0
> Gi1/0/8 8 8 8 0
> Gi1/0/9 9 9 9 0
> Gi1/0/10 10 10 10 0
> Gi1/0/11 11 11 11 0
> Gi1/0/12 12 12 12 0
> Gi1/0/13 13 13 13 0
> Gi1/0/14 14 14 14 0
> Gi1/0/15 15 15 15 0
> Gi1/0/16 16 16 16 0
> Gi1/0/17 17 17 17 0
> Gi1/0/18 18 18 18 0
> Gi1/0/19 19 19 19 0
> Gi1/0/20 20 20 20 0
> Gi1/0/21 21 21 21 0
> Gi1/0/22 22 22 22 0
> Gi1/0/23 23 23 23 0
> Gi1/0/24 24 24 24 0
> Gi1/0/25 25 25 25 1
> Gi1/0/26 26 26 26 1
> Gi1/0/27 27 27 27 1
> Gi1/0/28 28 28 28 1
> Gi1/0/29 29 29 29 1
> Gi1/0/30 30 30 30 1
> Gi1/0/31 31 31 31 1
> Gi1/0/32 32 32 32 1
> Gi1/0/33 33 33 33 1
> Gi1/0/34 34 34 34 1
> Gi1/0/35 35 35 35 1
> Gi1/0/36 36 36 36 1
> Gi1/0/37 37 37 37 1
> Gi1/0/38 38 38 38 1
> Gi1/0/39 39 39 39 1
> Gi1/0/40 40 40 40 1
> Gi1/0/41 41 41 41 1
> Gi1/0/42 42 42 42 1
> Gi1/0/43 43 43 43 1
> Gi1/0/44 44 44 44 1
> Gi1/0/45 45 464 45 1
> Gi1/0/46 46 465 46 1
> Gi1/0/47 47 457 47 1
> Gi1/0/48 48 456 48 1
> Gi1/0/49 49 49 49 0
> Gi1/0/50 50 50 50 0
> Gi1/0/51 51 51 51 1
> Gi1/0/52 52 52 52 1
>
> -----Original Message-----
> From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of
> Bryan Holloway
> Sent: Thursday, December 14, 2017 7:55 PM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] Cisco 3750G backplane throughput
>
> This message originates from outside of your organisation.
>
> Hello community,
>
> I'm curious if someone is in the know or can point me to a document that
> describes how the backplane is carved up on a 3750G. I.e., ports per ASIC,
> etc., if applicable. I've dug around the Cisco docs to no avail.
>
> I'm particularly interested to know how the four-port SFP section is
> handled on, for example, a WS-C3750G-24TS. Does it have its own ASIC for
> all four SFP ports? Or is that also carved up amongst other ports? If one
> were to LAG all four SFP ports together, should one expect to be able to
> reach a full 4 Gbps (assuming no taxation from other switch ports?)
>
> We're running into an odd issue where we're unable to achieve more than
> 2 Gbps of bandwidth, but I have a hard time believing this is a switch
> limitation.
>
> Any input would be most appreciated, thanks!
>
> - bryan
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--
Regards,
Chris Knipe
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