[c-nsp] 3750G packet loss

[Saku Ytti]

On (2005-10-14 10:14 +0100), Ed Butler - RapidSwitch wrote:

> To be clear on this, the 3750s are forwarding traffic 100% correctly with no
> loss, however they're not dealing with traffic to themselves very well.
> They're not stressed either, running ~10% CPU usage.
> 
>                   Packets               Pings
>  Host          Loss%   Snt   Last   Avg  Best  Wrst StDev
>  1. cisco3750  81.6%  1227    0.4   0.5   0.3   2.7   0.3
>  2. linuxhost   0.0%  1227    0.2   0.2   0.1  16.2   1.7
> 
> Does anyone have any experience with a similar problem or situation, and can
> advise how to deal with it?

 3750 has quite agressive defences against the control-plane. You can give 
it's control-plane 1.4Mpps of packets and your OSPF/BGP will stay up and it will
forward packets normally.
 So it might be that you have large amount of background traffic towards
the control-plane or then you might have packets stuck in hold-queue. 

 To investigate further please provide:
sh int | i Input queue: [^0]
show buffers old dump | in inputtime
sh ver | i uptime

> 
> Thanks,
> 
> Regards,
> 
> Ed Butler
> RapidSwitch Ltd
> DDI: 020 7106 0731
> 
> RapidSwitch Ltd, 5th Floor, Sovereign House, 227 Marsh Wall, London, E14 9SD
> 
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> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Richard Gallagher
> Sent: 14 October 2005 10:04
> To: Maxim Tuliuk
> Cc: Asbjorn Hojmark - Lists; cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] software upgrade 3750 to 3750 Metro
> 
> From:
> 
> http://www.cisco.com/en/US/products/hw/switches/ps5532/products_data_sheet09
> 186a00801eb820.html
> 
> The Enhanced Services ports support enhanced features such as Hierarchical
> QoS and Traffic Shaping, intelligent 802.1Q tunneling, VLAN translation,
> MPLS, and EoMPLS. These ports can serve as uplinks to metro aggregation
> points, including the Cisco Catalyst 4500 and Catalyst 6500 series and the
> Cisco 7600 Series, and they provide greater intelligence at the network
> edge.
> 
> The regular cat3750 does not have the same ES ports avialable to enable
> these extra features.
> 
> HTH, Ric
> 
> Maxim Tuliuk wrote:
> > On Fri, Oct 14, 2005 at 10:26 +0200, Asbjorn Hojmark - Lists wrote:
> >>> Can I do upgrade from 3750 to 3750 Metro?  If yes how?
> >> No.
> >>
> >> The 3750ME has a small PXF router onboard, so it's simply not the 
> >> same hardware.
> > 
> > Is it official or unofficial information? i.e I didn't find about it 
> > on cisco site
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-- 
  ++ytti