[c-nsp] Output drops on 2960

[Jeremy Bresley]

BRKARC-3438 from CiscoLive has a great architectural session detailing 
the 3650/3850s.  Pages 80-82 mention that there's a 6MB buffer compared 
to a 2MB buffer on the 3750X.

In my previous job, I did start rolling out 3650s to several locations.  
Other than the IOS XE image being significantly larger and taking longer 
to download to switches at a remote site with a small circuit, we had 0 
issues with them operationally. Configurations from older 3560 series 
switches are 99% copy/paste (a few minor things that were mostly 
cosmetic changes or differences in syntax like multicast routing 
configuration, which is the same on 3650/3850 as it is on 4500E/X now).

One point to be aware of if you're coming from 3560X/3750X is that the 
3850 continues to have the uplink modules, the 3650s went back to a 
fixed configuration for the uplink ports, so you need to decide if you 
want 1G or 10G uplinks when you purchase them.  Pricing on the 3650s 
were the same for a like-for-like 3560X.  3650s can also have a 4x10G 
uplink, which makes them a lot more suitable for a small IDF aggregation 
switch than the 3560X's which only had 2 10G ports available.

Jeremy Bresley
brez at brezworks.com

(I work for Cisco, but this is information I got from a public 
presentation, and I'm in no way speaking for my employer.)

On 2/5/16 14:01, John Gaffney wrote:
> We do have a few of those out the in field and they are solid switches. Not a bad thought. Looking at the buffer size table looks like its much fatter than the 2960..
>
> The 3850 and 3650 seem like OK middle ground. Anybody deploy those? They decent?
>
> Thanks,
>
> John
>
> -----Original Message-----
> From: Mack McBride [mailto:mack.mcbride at viawest.com]
> Sent: Friday, February 5, 2016 1:37 PM
> To: John Gaffney <jgaffney at nan.com>; Nick Cutting <ncutting at edgetg.co.uk>; Tom Hill <tom at ninjabadger.net>
> Cc: cisco-nsp at puck.nether.net
> Subject: RE: [c-nsp] Output drops on 2960
>
> 4948Es are pretty good if you need 10/100/1000.
> They are also relatively cheap and can be bought used at a good discount.
> If you don't need 10/100 then the Nexus 9300 series has a shared 50Mbyte buffer.
> But they are relatively pricey and new so used is not really available.
>
>
> Mack McBride | Senior Network Architect | ViaWest, Inc.
> O: 720.891.2502 | C: 303.720.2711 | mack.mcbride at viawest.com | www.viawest.com
>
>
> -----Original Message-----
> From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of John Gaffney
> Sent: Friday, February 05, 2016 10:46 AM
> To: Nick Cutting; Tom Hill
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Output drops on 2960
>
> This looks like a great guide.
>
> Looks like I'll be working to replace the switch with something with more power. Any body have a recommendation for a switch with some bigger buffers and 2x 10G uplinks? Need at least 12 Gig ports.
>
> Thanks,
>
> John
>
>
> -----Original Message-----
> From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Nick Cutting
> Sent: Friday, February 5, 2016 11:00 AM
> To: Tom Hill <tom at ninjabadger.net>
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Output drops on 2960
>
> I use this list for switch buffers - seems pretty accurate to me:
>
> http://people.ucsc.edu/~warner/buffer.html
>
>
> -----Original Message-----
> From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Tom Hill
> Sent: 05 February 2016 15:54
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Output drops on 2960
>
> On 05/02/16 15:45, Nikolay Shopik wrote:
>>>> Though, I've not seen anything mentioned in regards to the newer 3650/3850.
>> These have double amount of shared memory compare to what 2960S/3560X
>> have
> Good to know!
>
>
> --
> Tom
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