[c-nsp] Output drops on 2960

[Antoine Monnier]

In our environment, with QoS applied on the LAN (classification, marking,
queuing, etc) we have had quite a few issues with the 3850 deployed at the
access-layer, mainly centered on QoS. We are at our fourth release due to
the QoS issues.
Cisco has now promised us (we have heard it before) the QoS issues are
fixed in 3.6.3, however the latest issue is corruption of the flash when
upgrading to 3.6.3 ... not what you want when upgrading lot of switches
from remote....

Has anyone used "advanced features" (DHCP snooping, DAI, .1x, WLC, CAPWAP
termination, etc) on that switch? Are you running into bugs a lot?



On Fri, Feb 5, 2016 at 8:41 PM, Jeremy Bresley <brez at brezworks.com> wrote:

> 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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