Keith Woodworth wrote: > > |->> Anyway to acutally tell for certain if the router is dropping packets? > |-> > |->show buffers > |->show queueing > |->show queue interface etc. > > Showing misses/failures on all buffers but these have the most: > > Small buffers, 104 bytes (total 50, permanent 50, peak 201 @ 7w0d): > 44 in free list (20 min, 150 max allowed) > 1991931468 hits, 98395 misses, 43142 trims, 43142 created > 2371 failures (0 no memory) > Middle buffers, 600 bytes (total 25, permanent 25, peak 92 @ 3d20h): > 23 in free list (10 min, 150 max allowed) > 43042905 hits, 2828 misses, 2508 trims, 2508 created > 703 failures (0 no memory) > Big buffers, 1524 bytes (total 50, permanent 50, peak 68 @ 6d12h): > 50 in free list (5 min, 150 max allowed) > 12398616 hits, 359 misses, 81 trims, 81 created > 79 failures (0 no memory) > > so according to docs on CCO about buffers, misses/failures usually lead to > dropped packets. This leads me to believe that data is coming in at a rate > higher than the RP can keep up though. Will have to look at upping the # > of permenant buffers and see if that helps. > As Priscilla explained, output drops are frequently normal, just indicating a speed mismatch combined with a large enough packet burst that the output queue limit was exceeded (40 packets). If drops are due to a lack of buffers, then that would happen on input, not output, and the counter "no buffer" would be incrementing.
The display above shows that for each of the categories, IOS grew the list above its initial size due to some transient need, then trimmed each of them back. Notice that trims = creates. See the peak values and how long ago they occurred. For an ISP or border router, CEF will help a lot since the route-cache is pre-built, rather than demand based. With the latter, lots of short-lived flows to lots of destinations cause the first packets of each flow to be process-switched. And there's far less cache maintenance or churn. CEF also works fine with netflow and policy routing. - Marty Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=57975&t=57922 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
