Thanks to everyone who responded both on- and off-list.
To expand on what's happening, here's the scenario:
Five-port copper LACP on Gig1/0/6-10 facing downstream equipment/customers.
Four-port ECMP using the 3750G SFP ports (Gig1/0/25-28) facing upstream
transit.
(Don't laugh ... well, ok ... it's ok to laugh. We inherited this.)
We're seeing equal/nicely-balanced utilization across all ports, but we
can't seem to push more than 2 Gbps. But based on the ASIC layout, it
doesn't seem like that should be an issue.
I'll concede (your honor) that this isn't the best use-case for a 3750G,
but I'll just throw it out there and see if anyone can think of a reason
for the bottleneck.
Thanks again, everyone.
On 12/15/17 6:47 AM, Chris Knipe wrote:
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 <[email protected]> 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:* [email protected] [mailto:[email protected]] *On Behalf Of *Chris
Knipe
*Sent:* Friday, December 15, 2017 7:38 AM
*To:* Nick Cutting <[email protected]>
*Cc:* cisco-nsp ([email protected]) <[email protected]>
*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 <[email protected]> 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:[email protected]] On Behalf Of
Nick Cutting
Sent: Friday, December 15, 2017 7:29 AM
To: Bryan Holloway <[email protected]>; [email protected]
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:[email protected]] On Behalf Of
Bryan Holloway
Sent: Thursday, December 14, 2017 7:55 PM
To: [email protected]
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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