07-08-2008 02:44 PM - edited 03-06-2019 12:04 AM
Hi everybody,
I'm having this problem, i have some switch in my network that have been having some problems with administration. In order to manage the devices i use the vlan 1 and just for that. When i checked the status of the interface vlan 1 on those switches that are having the problem i found that the reliability is low and that i have alot of input errors on the interface, here i show you:
sh int vlan1
Vlan1 is up, line protocol is up
Hardware is CPU Interface, address is 0007.8437.2b40 (bia 0007.8437.2b40)
Internet address is 192.168.18.5/24
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 128/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output never, output hang never
Last clearing of "show interface" counters 07:27:45
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 10000 bits/sec, 160 packets/sec
5 minute output rate 5000 bits/sec, 6 packets/sec
4265824 packets input, 32209176 bytes, 0 no buffer
Received 332 broadcasts (0 IP multicast)
0 runts, 0 giants, 266608 throttles
3777829 input errors, 0 CRC, 0 frame, 0 overrun, 9960 ignored
192675 packets output, 16684602 bytes, 0 underruns
0 output errors, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
I already checked the status of the interfaces that are trunk between those switch and there are not input errors or CRC...do you have any suggestion to find out what is going on???
07-08-2008 03:09 PM
What kind of switch is this? The main error that you are having are throttles. Throttles are generally caused by congestion on the interface. I would recommend upgrading the switch because the amount of errors generated over such a small period of time is pretty extensive. You could also try to distribute the traffic over multiple VLAN's. I would also assume that you are having serious performance issues as well.
Mark
07-08-2008 03:32 PM
Hi Mark!
The switch are WS-C2950-24 and we are having problems just with the int vlan 1, i mean when i ping that ip address we have very hight times and if we ping another device that is connected on a different vlan on a port on this switch and the times are fine
07-08-2008 06:33 PM
I am curious as to why your VLAN interface is processing that much traffic. How many interfaces are connected and using VLAN 1? The bottom line is that your switch is over utilized.
Mark
07-09-2008 06:32 AM
Hi Mark,
There are two trunk interfaces in the switch wich are connected to two different switch, those interfaces don't have input errors and are not with too much traffic (like 1 or 2 Mbps and are interfaces 100Mbps)...
Thanks alot
Alfonso
07-10-2008 06:55 AM
Hi Everydoby,
I found the solution, the problem is related with the bug CSCea23138:
Input errors on management vlan with vlan mismatch on trunk
When you connect the 2950 via a trunk to other switches and if the number of
VLANs on the 2950 is lower than the number on the connected switch, you may
see 'input errors' on the management VLAN interface of the 2950 when you
issue "show interface".
The workaround is to match the vlans configured on either side of the trunk
link. This stops the errors.
It is not solve in the latest version wich is 12.1(22)EA10a
Best regards,
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