06-21-2005 06:49 AM - edited 03-03-2019 09:51 AM
All
the show buffers pasted as following
Buffer elements:
491 in free list (500 max allowed)
18929063 hits, 0 misses, 0 created
Public buffer pools:
Small buffers, 104 bytes (total 1000, permanent 1000, peak 3970 @ 1w2d):
995 in free list (250 min, 1375 max allowed)
35499283 hits, 4324890 misses, 71508 trims, 71508 created
1927801 failures (0 no memory)
Middle buffers, 600 bytes (total 25, permanent 25, peak 2146 @ 1w1d):
19 in free list (10 min, 150 max allowed)
11249741 hits, 5323403 misses, 34260 trims, 34260 created
4237365 failures (0 no memory)
Big buffers, 1536 bytes (total 50, permanent 50, peak 1225 @ 1w1d):
50 in free list (5 min, 150 max allowed)
1374918 hits, 3759526 misses, 15144 trims, 15144 created
3018838 failures (0 no memory)
VeryBig buffers, 4520 bytes (total 10, permanent 10, peak 278 @ 1w1d):
10 in free list (0 min, 100 max allowed)
474945 hits, 2543899 misses, 2362 trims, 2362 created
2543899 failures (0 no memory)
Large buffers, 5024 bytes (total 0, permanent 0, peak 188 @ 22:20:27):
0 in free list (0 min, 10 max allowed)
There is a high number of buffer failures even though there is enough memory and CPU resourses. The total packet drops is very low so this does not produce any negative impact elswhere.
What could be the reason/s
TIA
06-22-2005 06:54 AM
Hi Amlendu,
when a packet arrives on a router interface, it is classified as small, middle, big, very big or large and put in the appropriate ring buffer.
It might happen that there is no space at that particular time (a miss) or that there is space (a hit). A miss leads to a dynamic allocation of the required buffer space.
A failure, however, indicates that there was no memory available and that the packet was lost.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/fun_r/cfr_1g07.htm#wp1057860
If the number of failures does not add up to the total number of drops on the interface, this may be a cosmetic bug.
HTH
Marcel
06-23-2005 04:19 AM
Hi Marcel
memory can be ruled out as show mem sum produces the following
SCB_NBO1R_57725>sh mem sum
Head Total(b) Used(b) Free(b) Lowest(b) Largest(b)
Processor 629DD8E0 64104224 8996000 55108224 51721180 53785104
I/O 6700000 26214400 2544888 23669512 14042992 2366927
There is 55 mb for processor and 23 mb available for IO. Is it possible this is a IOS bug ?
This many buffer failures just doesnt make sence.
06-23-2005 06:18 AM
Hi Amlendu,
cosmetics bugs like these are certainly not uncommon. What ios version are you running?
-Marcel
06-24-2005 04:59 AM
I have decided to upgrade this router to 3745 from 3640.
06-24-2005 05:53 AM
Without running the same ios version, I hope? It'd be interesting to see if this solved the problem. Do let us know.
Regards,
Marcel
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide