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New Member

2950T buffer failures

Hello everyone,

I'm seeking advise to resolve my findings in Catalyst switch 2950T, The switch appears hang up when i encounter the problem while connected remotely (telnet) further invistigation shows that my uplink and their physical connection in use by the work station are just fine.

However the work station connected are experiencing a slowdown, i check my memory utilization and processor utilization but seems theyre just ok (26% for the CPU and 60% for the memory).

I attach the buffers failure listed below for a reference and to help me to determine if this is the cause of my problem.

switch12.4#sh buffers

Buffer elements:

499 in free list (500 max allowed)

11946867 hits, 0 misses, 0 created

Public buffer pools:

Small buffers, 104 bytes (total 60, permanent 25, peak 97 @ 2w0d):

60 in free list (20 min, 60 max allowed)

71530695 hits, 18267 misses, 19251 trims, 19286 created

5121 failures (0 no memory)

Middle buffers, 600 bytes (total 27, permanent 15, peak 38 @ 1w2d):

25 in free list (10 min, 30 max allowed)

3325024 hits, 1217 misses, 811 trims, 823 created

627 failures (0 no memory)

Big buffers, 1524 bytes (total 8, permanent 5, peak 82 @ 1d05h):

8 in free list (5 min, 10 max allowed)

324106 hits, 1235 misses, 1863 trims, 1866 created

484 failures (0 no memory)

VeryBig buffers, 4520 bytes (total 10, permanent 0, peak 16 @ 1d05h):

10 in free list (0 min, 10 max allowed)

199080 hits, 324 misses, 13 trims, 23 created

321 failures (0 no memory)

Large buffers, 5024 bytes (total 0, permanent 0, peak 6 @ 1d05h):

0 in free list (0 min, 5 max allowed)

9 hits, 312 misses, 16 trims, 16 created

312 failures (0 no memory)

Huge buffers, 18024 bytes (total 0, permanent 0, peak 6 @ 1d05h):

0 in free list (0 min, 2 max allowed)

5 hits, 307 misses, 16 trims, 16 created

307 failures (0 no memory)

Interface buffer pools:

Calhoun Packet Receive Pool buffers, 1560 bytes (total 512, permanent 512):

383 in free list (0 min, 512 max allowed)

66841850 hits, 0 misses

Cisco Employee

Re: 2950T buffer failures

Can you paste the output of sh ver? Also check to see if there is any broadcast/multicast storm hitting your switch and depleting the buffers

New Member

Re: 2950T buffer failures

Thanks for the reply... Should I look per interface to determine the utilzation? The switch is located in VLAN12 of my VLAN network, by the way there are about 12 same cases (located in different VLAN segment ) i notice and all of them experiencing the same problem, All of the switch I mentioned are Catalyst 2950T

switch12.4#sh ver

Cisco Internetwork Operating System Software

IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(9)EA1, RELEASE SOFTWARE (


Copyright (c) 1986-2002 by cisco Systems, Inc.

Compiled Wed 24-Apr-02 06:57 by antonino

Image text-base: 0x80010000, data-base: 0x804E8000

ROM: Bootstrap program is CALHOUN boot loader

switch12.4 uptime is 6 weeks, 5 days, 16 hours, 29 minutes

System returned to ROM by power-on

System restarted at 19:32:59 UTC Sat Mar 22 2003

System image file is "flash:c2950-i6q4l2-mz.121-9.EA1.bin"

cisco WS-C2950T-24 (RC32300) processor (revision E0) with 20815K bytes of memory


Processor board ID FOC0630X0J7

Last reset from system-reset

Running Enhanced Image

24 FastEthernet/IEEE 802.3 interface(s)

2 Gigabit Ethernet/IEEE 802.3 interface(s)

32K bytes of flash-simulated non-volatile configuration memory.

Base ethernet MAC Address: 00:0A:8A:64:48:40

Motherboard assembly number: 73-6114-07

Power supply part number: 34-0965-01

Motherboard serial number: FOC063000M8

Power supply serial number: DAB06275Q3U

Model revision number: E0

Motherboard revision number: B0

Model number: WS-C2950T-24

System serial number: FOC0630X0J7

Configuration register is 0xF

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