what's your experience w/TOP 10 Cisco Buffer Misses

Network_Guru

Has anyone looked into the Cisco buffer misses reported in Orion.

What impact do they have to network traffic or end user applications, if any?
What have you done to tune these? 

All Buffer Misses	Out of Memory	Small Buffer	Medium Buffer	Big Buffer	Large Buffer	Huge Buffer
Combined	Failures	Misses	Misses	Misses	Misses	Misses
146,818 misses	0 failures	146,786 misses	1 misses	31 misses	0 misses	0 misses
70,814 misses	0 failures	0 misses	17,818 misses	18,650 misses	17,245 misses	17,101 misses
70,694 misses	0 failures	70 misses	0 misses	70,624 misses	0 misses	0 misses
67,948 misses	0 failures	309 misses	141 misses	53,221 misses	7,319 misses	6,958 misses
67,848 misses	0 failures	67,824 misses	0 misses	24 misses	0 misses	0 misses
66,876 misses	0 failures	3 misses	0 misses	66,873 misses	0 misses	0 misses
66,807 misses	0 failures	368 misses	12,038 misses	19,545 misses	17,500 misses	17,356 misses
66,720 misses	0 failures	1,171 misses	13,843 misses	18,340 misses	16,737 misses	16,629 misses
34,684 misses	0 failures	34,660 misses	0 misses	24 misses	0 misses	0 misses
17,448 misses	0 failures	481 misses	16,967 misses	0 misses	0 misses	0 misses

Here is the Report Writer report I created for this (last 7 days):
(I'm not sure if this is a precanned report or not).

SELECT TOP 10
DatePart(Week,DateTime) AS SummaryWeek,
Nodes.Caption AS NodeName,
SUM((BufferSmMiss+BufferMdMiss+BufferBgMiss+BufferLgMiss+BufferHgMiss)) AS SUM_of_AllMisses,
SUM(CiscoBuffers.BufferNoMem) AS SUM_of_BufferNoMem,
SUM(CiscoBuffers.BufferSmMiss) AS SUM_of_Small_Buffer_Misses,
SUM(CiscoBuffers.BufferMdMiss) AS SUM_of_Medium_Buffer_Misses,
SUM(CiscoBuffers.BufferBgMiss) AS SUM_of_Big_Buffer_Misses,
SUM(CiscoBuffers.BufferLgMiss) AS SUM_of_Large_Buffer_Misses,
SUM(CiscoBuffers.BufferHgMiss) AS SUM_of_Huge_Buffer_Misses

FROM
Nodes INNER JOIN CiscoBuffers ON (Nodes.NodeID = CiscoBuffers.NodeID)


WHERE
( DateTime BETWEEN 39582 AND 39589.5416666667 )
 AND 
(
  (Nodes.Vendor = 'Cisco')
)


GROUP BY DatePart(Week,DateTime),
Nodes.Caption


ORDER BY SummaryWeek ASC, 3 DESC

jtimes

Cool report NG!  Put it in the Content Sharing Zone

 Cisco's take on understanding Buffer Misses and Failures:

http://www.cisco.com/en/US/products/hw/modules/ps2643/products_tech_note09186a0080093fc5.shtml#topic1

Cisco's Buffer tuning doc:

http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a00800a7b80.shtml

Generally speaking, and this really depends on the manufacture, but on Cisco's only Huge buffer misses = dropped packets UNLESS you are using the IBM feature set; if so then almost every miss is a dropped packet.

We really haven't had buffer miss type issues since we retired our lower-end routers and switches in the core, but I remember having to do all this via CLI on the dreaded 4500, 4700 and 7500's (good times)