10-04-2007 05:38 AM - edited 03-05-2019 06:52 PM
Hello mates,
I am having some difficults finding the reason why buffers at all my Catalyst 2950 are being incremented in all the buffers.
As I ve been reading at the output interpreter and some Ciscos Docs failures are equal to drop packets.
Here I ve pasted a few outputs commands from one of this Catalyst 2950.
My question is:
Does anybody understand this? Is there any way to solve it?
The output interpreter saids that packets are being dropped but cpu and memory seems to be ok.
Thanks in advance to all of the networkers.
sh ver
Cisco Internetwork Operating System Software
IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(22)EA7, RELEASE
sh buffer
Buffer elements:
499 in free list (500 max allowed)
139451641 hits, 0 misses, 0 created
Public buffer pools:
Small buffers, 104 bytes (total 60, permanent 25, peak 181 @ 5w2d):
60 in free list (20 min, 60 max allowed)
483868967 hits, 10495037 misses, 11333498 trims, 11333533 created
590919 failures (0 no memory)
Middle buffers, 600 bytes (total 36, permanent 15, peak 110 @ 5w2d):
32 in free list (10 min, 30 max allowed)
15212634 hits, 980925 misses, 492011 trims, 492032 created
484141 failures (0 no memory)
Big buffers, 1524 bytes (total 10, permanent 5, peak 27 @ 5w2d):
10 in free list (5 min, 10 max allowed)
4152603 hits, 4845901 misses, 1054876 trims, 1054881 created
4087385 failures (0 no memory)
VeryBig buffers, 4520 bytes (total 10, permanent 0, peak 30 @ 03:10:54):
10 in free list (0 min, 10 max allowed)
5558664 hits, 2773806 misses, 304006 trims, 304016 created
2682686 failures (0 no memory)
Large buffers, 5024 bytes (total 5, permanent 0, peak 7 @ 5w2d):
5 in free list (0 min, 5 max allowed)
606029 hits, 2076657 misses, 102597 trims, 102602 created
2076657 failures (0 no memory)
Huge buffers, 18024 bytes (total 2, permanent 0, peak 4 @ 5w2d):
2 in free list (0 min, 2 max allowed)
211191 hits, 1865466 misses, 97602 trims, 97604 created
1865466 failures (0 no memory)
10-04-2007 06:07 AM
10-05-2007 01:32 AM
A "Miss" can occur if the number of buffers in the free list is less than the "Min" value. A "Failure" is when no buffers were available
that is
"Miss" does not mean packet drop.
"Miss" and "Failure" means a drop packet
You can use the buffer tuning tool to tune the buffers
10-05-2007 04:42 AM
Personally i have never heard of tuning buffers on a layer 2 switch . It s possible that you are overloading that low end switch and you should think about getting something more robust . On the interfaces look at see what all the traffic is , is it large amount of broadcast traffic , is someone multicasting and nothing is setup to handle something like this .
10-05-2007 06:56 AM
First of all thanxs for this fast reply to both of you.
I don?t have it very clear in order to modify the buffers as recomended by Cisco as Cat 2950 are not very big in memory.
And as Glen said it could be a way to solve this issue to move into a bigger choice like Cat 3750 but not to sure and not very technical.
That traffic must be studied as it seems to be most of it broadcast.
I?ve reloaded that Catalyst in order to check error clearing counters and the buffers are incrementing always.
Seem to be a problem that overload the buffers.
DO any of you gays know a solutions for this type of issue? Storm-control ...
Thanxs in advance
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