[c-nsp] Cisco 3750G backplane throughput
Chris Knipe
savage at savage.za.org
Fri Dec 15 07:47:15 EST 2017
Yeah,
I don't know about 2G specifically, but we have noticed in the past that
their performance aren't too great. Especially once you start stacking
them, or start pushing high BW across multiple ASICs.
It is at the end of the day more of a distribution switch rather than
anything else (with quite small buffers I may add). Personally, given the
OPs original message, I wouldn't rule out the switch completely, TBH.
--
Chris.
On Fri, Dec 15, 2017 at 2:42 PM, Nick Cutting <ncutting at edgetg.com> wrote:
> Nice work – The generation 1 and 2 3560 and 3750’s had 2/4 ASICS.
>
>
>
> I was wrong earlier, (switch replaced on me!) the E and the X have 1 per
> 24 ports.
>
>
>
> I did dig one up – and got the same results as below
>
>
>
> Each SFP is on ONE of the ASICs shared by the copper ports.
>
>
>
> *From:* cknipe at savage.za.org [mailto:cknipe at savage.za.org] *On Behalf Of *Chris
> Knipe
> *Sent:* Friday, December 15, 2017 7:38 AM
> *To:* Nick Cutting <ncutting at edgetg.com>
> *Cc:* cisco-nsp (cisco-nsp at puck.nether.net) <cisco-nsp at puck.nether.net>
> *Subject:* Re: [c-nsp] Cisco 3750G backplane throughput
>
>
>
> *This message originated from outside your organization.*
> ------------------------------
>
> 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
>
--
Regards,
Chris Knipe
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