11-27-2002 07:25 AM - edited 03-02-2019 03:12 AM
Using IOS c6msfc2-jsv-mz.121-12c.E4
Medium buffers are failing:
Medium buffers, 256 bytes (total 0, permanent 0, peak 3 @ 1d23h):
0 in free list (0 min, 0 max allowed)
4 hits, 95681 misses, 8 trims, 8 created
95677 failures (0 no memory)
BUT I cannot correct the situation, as there is no entry to configure medium buffers:
ott2-boot-gw(config)#buffers ?
Vlan Catalyst Vlans
big Big buffers
huge Huge buffers
large Large buffers
middle Middle buffers
small Small buffers
verybig Very Big buffers
Any help on this is appreciated. Thanks. JP
Solved! Go to Solution.
12-02-2002 01:13 PM
The problem you are seeing with the medium buffers on the MSFC2 is documented in the following ddts (this problem is not present in the MSFC):
CSCdy17894 - Medium buffer pool with no buffers cause lots of failures
Here is some information from this bug:
On a MSFC2 running in hybrid mode (catos on the supervisor, IOS on the
MSFC2), since 12.1(11b)E there has been a medium buffer pool introduced.
However, the buffer pool is not populated :
MSFC2#sh buff
Buffer elements:
499 in free list (500 max allowed)
2111 hits, 0 misses, 0 created
Public buffer pools:
Small buffers, 104 bytes (total 50, permanent 50):
50 in free list (20 min, 150 max allowed)
5526 hits, 0 misses, 0 trims, 0 created
0 failures (0 no memory)
Medium buffers, 256 bytes (total 0, permanent 0, peak 2 @ 00:28:38):
0 in free list (0 min, 0 max allowed)
2 hits, 127 misses, 4 trims, 4 created
125 failures (0 no memory)
The result is that virtually all traffic destined for this pool is
dropped, hence there is a large amount of failures being reported.
This problem was not seen on MSFC and with native IOS.
Workaround : This problem is not present in previous versions of IOS.
This bug is duplicate of :
CSCdx15857 - J-HYB:Buffer failures
This problem happens because medium buffer is created
on both native and hybrid but is only populated on native.
This problem is not service affected since when system
fails to get buffer from this medium buffer pool, it will try
to get buffers from next public buffer pool.
Another option would be to downgrade to 121-8b.E9.
12-02-2002 01:13 PM
The problem you are seeing with the medium buffers on the MSFC2 is documented in the following ddts (this problem is not present in the MSFC):
CSCdy17894 - Medium buffer pool with no buffers cause lots of failures
Here is some information from this bug:
On a MSFC2 running in hybrid mode (catos on the supervisor, IOS on the
MSFC2), since 12.1(11b)E there has been a medium buffer pool introduced.
However, the buffer pool is not populated :
MSFC2#sh buff
Buffer elements:
499 in free list (500 max allowed)
2111 hits, 0 misses, 0 created
Public buffer pools:
Small buffers, 104 bytes (total 50, permanent 50):
50 in free list (20 min, 150 max allowed)
5526 hits, 0 misses, 0 trims, 0 created
0 failures (0 no memory)
Medium buffers, 256 bytes (total 0, permanent 0, peak 2 @ 00:28:38):
0 in free list (0 min, 0 max allowed)
2 hits, 127 misses, 4 trims, 4 created
125 failures (0 no memory)
The result is that virtually all traffic destined for this pool is
dropped, hence there is a large amount of failures being reported.
This problem was not seen on MSFC and with native IOS.
Workaround : This problem is not present in previous versions of IOS.
This bug is duplicate of :
CSCdx15857 - J-HYB:Buffer failures
This problem happens because medium buffer is created
on both native and hybrid but is only populated on native.
This problem is not service affected since when system
fails to get buffer from this medium buffer pool, it will try
to get buffers from next public buffer pool.
Another option would be to downgrade to 121-8b.E9.
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