Hi people,
I work on a network with about 1000 switches/routers of which a hundred of 2950 switches (2950G, 2950ST and so on...).
We monitor the network with some management tools such as Groundwork, Netcool and CiscoWorks LMS (via ICMP).
Randomly for a few seconds some 2950 switches are unreachable from management tools.
On some 2950 IOS firmware has been upgraded, but the situation has not changed.
The strange thing is that during the management problem, the management interface (interface VLAN 39) is encountering a very fast increase of throttles (and only throttles ..).
I show the interface throttles:
M11-SW-M1-201#sh int vlan 39
Vlan39 is up, line protocol is up
Hardware is CPU Interface, address is 000b.fc49.9b00 (bia 000b.fc49.9b00)
Internet address is 172.19.71.1/16
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
ARP type: ARPA, ARP Timeout 00:05:00
Last input 00:00:00, output never, output hang never
Last clearing of "show interface" counters 02:48:23
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
30 second input rate 27000 bits/sec, 29 packets/sec
30 second output rate 11000 bits/sec, 21 packets/sec
312488 packets input, 30723335 bytes, 0 no buffer
Received 21054 broadcasts (0 IP multicast)
0 runts, 0 giants, 4287 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
223544 packets output, 16772916 bytes, 0 underruns
0 output errors, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
.
On other switches (3750, 3560 and so on...) these problems (and the throtthes) are not present.
Does anyone know tell us what can trigger this problem and how workaround it ?
Best Regard in advance,
Luca
