[c-nsp] Cisco 4900M Issue

[Jirí Procházka]

Hello list,

I'm having the very same problem as Jimmy.

We've got one 4900M (IOS 12.2(53)SG) in our production network and under 
heavy load following message is appearing in the log ->

%C4K_SWITCHINGENGINEMAN-4-IPPLLCINTERRUPTFREELISTBELOWHIPRIORITYTHRESHOLD: 
(Suppressed 148 times)IPP LLC freelistBelowHiPriorityThreshold interrupt

The more traffic is flowing over the switch, the more often this message 
occurs.

All 8 non-subscribed ports are connected, each port is doing more than 
6gbps. Besides these 'built in' ports we are using WS-X4908-10GE module, but 
only 4 ports (1,3,5,7) are used.

So there are 12 ports (all in non-subscribed mode) connected. Each port is 
pushing something between 6-9 gbps.

Whole traffic is routed (there are about 5-10 BGP links on that switch)

CPU ulitization is at normal level(15-25%). All ports should be wire speed, 
so there shouldn't be any problem..but apparently is


Any help would be really appreciated!


Kind regards,

Jiri Prochazka



----- Original Message ----- 
From: "Eric Kujawski" <ekujawski at softlayer.com>
To: "Cisco NSP Mailing List" <cisco-nsp at puck.nether.net>
Sent: Tuesday, March 23, 2010 11:22 PM
Subject: Re: [c-nsp] Cisco 4900M Issue


> Jimmy,
>
> Per the Cisco document I'm looking at, the bottom (8) 10G ports are line
> rate (80G).  The top expansion slots are 40G each (2:1 oversubscription
> if you buy the 8 port cards).  As for your issue, we've not seen any
> problems like this on our 4900Ms (quite a number in production doing
> over 10G on the bottom ports in a 2x10G or 4x10G port-channel setup).
>
> Best of luck getting that tracked down.
>
> -Eric
>
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Jimmy Changa
> Sent: Tuesday, March 23, 2010 8:22 AM
> To: Cisco NSP Mailing List
> Subject: [c-nsp] Cisco 4900M Issue
>
> Greetings,
>
> I have 2 Cisco 4900M with Port Ten1/7 and Ten1/8 in a port-channel
> configuration. Under heavy load (10Gb or higher) I begin seeing a large
> number of dropped packets and the following error message in the logs:
>
> %C4K_SWITCHINGENGINEMAN-4-IPPLLCINTERRUPTFREELISTBELOWHIPRIORITYTHRESHOL
> D:
> (Suppressed 281 times)IPP LLC freelistBelowHiPriorityThreshold interrupt
>
> I've never seen this message before, and not much is availible online
> (including cisco.com). Has anyone else seen this before? Am I hitting
> some
> sort of limitation with the ports being on the same ASIC or something?
>
> Any insite appreciated.
>
> Thanks in advance.
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