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kishgiri8
Beginner

High memory utilization issue on multiple 2950 switches running IOS 12.1(22)EA14

Hi All,

I have high memory utilization occurring intermittently on multiple 2950 switches running IOS 12.1(22)EA14. The memory utilization is oscillating between 90% to 92%, with an average usage of 90%. One common thing noticed among all switches is the high number of buffer failures. Please find the logs below. Could anyone advise if these are some Cisco IOS bugs or a cause of concern ?  Also let me know, if more information is required.

Switch 1# show buffers
Buffer elements:
     498 in free list (500 max allowed)
     356897384 hits, 0 misses, 0 created

Public buffer pools:
Small buffers, 104 bytes (total 38, permanent 25, peak 181 @ 7w0d):
     37 in free list (20 min, 60 max allowed)
     588818807 hits, 12160 misses, 21642 trims, 21655 created
     3 failures (0 no memory)
Middle buffers, 600 bytes (total 18, permanent 15, peak 63 @ 7w0d):
     18 in free list (10 min, 30 max allowed)
     49100667 hits, 7158 misses, 8925 trims, 8928 created
     25 failures (0 no memory)
Big buffers, 1524 bytes (total 10, permanent 5, peak 34 @ 7w0d):
     10 in free list (5 min, 10 max allowed)
     19195022 hits, 5339542 misses, 2016176 trims, 2016181 created
     3429258 failures (0 no memory)
VeryBig buffers, 4520 bytes (total 10, permanent 0, peak 14 @ 7w0d):
     10 in free list (0 min, 10 max allowed)
     3334320 hits, 1731912 misses, 85896 trims, 85906 created
     1731910 failures (0 no memory)
Large buffers, 5024 bytes (total 5, permanent 0, peak 8 @ 7w0d):
     5 in free list (0 min, 5 max allowed)
 --More--              430335 hits, 1301575 misses, 73322 trims, 73327 created
     1301575 failures (0 no memory)
Huge buffers, 18024 bytes (total 2, permanent 0, peak 4 @ 7w0d):
     2 in free list (0 min, 2 max allowed)
     146906 hits, 1154669 misses, 67408 trims, 67410 created
     1154669 failures (0 no memory)

Interface buffer pools:
Calhoun Packet Receive Pool buffers, 1560 bytes (total 512, permanent 512):
     336 in free list (0 min, 512 max allowed)
     1299462975 hits, 0 misses

Switch 1# show buffers failures
Caller       Pool          Size      When
0x802D84C4  Big              710    00:21:04
0x802D84C4  Big             1498    00:21:02
0x802D84C4  Big              610    00:20:52
0x802D84C4  Big              610    00:20:52
0x802D84C4  Big             1498    00:18:56
0x802D84C4  Big             1498    00:18:56
0x802D84C4  Big             1498    00:18:53
0x802D84C4  Big             1498    00:18:53
0x802D84C4  Big             1498    00:16:55
0x802D84C4  Big              658    00:16:55

*****************************************************************************************************************************

Switch 2#  show buffers
Buffer elements:
     498 in free list (500 max allowed)
     589527798 hits, 0 misses, 0 created

Public buffer pools:
Small buffers, 104 bytes (total 31, permanent 25, peak 181 @ 7w0d):
     30 in free list (20 min, 60 max allowed)
     531359757 hits, 4784 misses, 11658 trims, 11664 created
     0 failures (0 no memory)
Middle buffers, 600 bytes (total 30, permanent 15, peak 63 @ 7w0d):
     30 in free list (10 min, 30 max allowed)
     36137453 hits, 1040 misses, 2659 trims, 2674 created
     0 failures (0 no memory)
Big buffers, 1524 bytes (total 10, permanent 5, peak 33 @ 7w0d):
     10 in free list (5 min, 10 max allowed)
     14110487 hits, 1494898 misses, 629152 trims, 629157 created
     933968 failures (0 no memory)
VeryBig buffers, 4520 bytes (total 10, permanent 0, peak 13 @ 7w0d):
     10 in free list (0 min, 10 max allowed)
     1852511 hits, 362391 misses, 34560 trims, 34570 created
     362389 failures (0 no memory)
Large buffers, 5024 bytes (total 1, permanent 0, peak 7 @ 7w0d):
     1 in free list (0 min, 5 max allowed)
 --More--              160403 hits, 201986 misses, 26861 trims, 26862 created
     201986 failures (0 no memory)
Huge buffers, 18024 bytes (total 1, permanent 0, peak 4 @ 7w0d):
     1 in free list (0 min, 2 max allowed)
     48906 hits, 153080 misses, 22701 trims, 22702 created
     153080 failures (0 no memory)

Interface buffer pools:
Calhoun Packet Receive Pool buffers, 1560 bytes (total 512, permanent 512):
     334 in free list (0 min, 512 max allowed)
     664800281 hits, 0 misses


Switch 2#show buffer failures
Caller       Pool          Size      When
0x802D84C4  Big              610    16:33:54
0x802D84C4  Big              610    16:33:54
0x802D84C4  Big              610    16:33:54
0x802D84C4  Big              610    16:33:54
0x802D84C4  Big              610    16:33:54
0x802D84C4  Big              610    16:33:54
0x802D84C4  Big              610    16:33:54
0x802D84C4  Big              610    16:33:53
0x802D84C4  Big              610    16:33:53
0x802D84C4  Big              610    16:33:53

Regards,

Kishan

1 REPLY 1
Philip D'Ath
Advisor

I would say you are experiencing a software defect, but those switches are old now, so I'm not sure if you could still get a software update for them.