Cisco 2924: Utilization maxed out?

[seanwest]

Hi,

i have a cisco 2924 switch set to 10/full because my netscreen 10 only supports 10MB. but with it at 10MB connected to the firewall or 100MB directly to the ISP
uplink i still seem to be maxing out the switch.

I click the button to see its use, and the lights are always maxed. im only using about 2MB of bandwith ( almost
2 t1's) and have 4 servers connected to it with intel pro 100 S server adapters. anyone know what this problem might be? do i need an additional switch?

Thank you
Sean

 

[byteya]

Sean, that doesn't seem right. I've connected around 15 heavily used servers into a 2924 before and not had problems with utilization. Check the interfaces and make sure there are not many errors. Are you trunking (vlans) to the servers? Do a show monitor and make sure you're not monitoring any ports or vlans.
*J*

 

[seanwest]

thank you for your response.

the switch to my understanding is just set to
each port 10/full

there are no other settings in use. i know i only
use 2MB but the traffic is mostly text, so
2MB is about 2-3,000 concurrent connections, can this
be a problem?

i know it cannot be the switch. is there a way that i can show you the system config or the show commands output?

Thank you very much again

Sean

 

[byteya]

Sean, capture a "show config" on the switch and post it here (leaving out any passwords).

If there is something wrong, people here will let you know. A "show int" would also display error counters that could discover something.
*J*

 

[seanwest]

Hi again

this is my "sho config"

Using 1463 out of 32768 bytes
!
version 11.2
no service pad
no service udp-small-servers
no service tcp-small-servers
!
hostname SIN
!
enable password XXXXXXXXXX
!
!
ip name-server XX.62.146.34
ip name-server XX.62.146.35
!
clock timezone PST 0
!
interface VLAN1
ip address XX.62.146.36 255.255.255.XXX
ip broadcast-address XX.62.146.XX
no ip route-cache
arp timeout 500
!
interface FastEthernet0/1
description Netscreen
speed 10
duplex full
!
interface FastEthernet0/2
!
interface FastEthernet0/3
!
interface FastEthernet0/4
description Server 1
speed 10
duplex full
!
interface FastEthernet0/5
!
interface FastEthernet0/6
!
interface FastEthernet0/7
!
interface FastEthernet0/8
!
interface FastEthernet0/9
!
interface FastEthernet0/10
description Server 2
speed 10
duplex full
!
interface FastEthernet0/11
!
interface FastEthernet0/12
!
interface FastEthernet0/13
!
interface FastEthernet0/14
!
interface FastEthernet0/15
!
interface FastEthernet0/16
description Server 3
speed 10
duplex full
!
interface FastEthernet0/17
!
interface FastEthernet0/18
!
interface FastEthernet0/19
!
interface FastEthernet0/20
!
interface FastEthernet0/21
description Server 4
speed 10
duplex full
!
interface FastEthernet0/22
!
interface FastEthernet0/23
!
interface FastEthernet0/24
!
ip default-gateway XX.62.146.33
snmp-server contact Sean West
snmp-server chassis-id 0x0F
banner login ^C
Authorized SIN Users ONLY! ^C
!
line con 0
stopbits 1
line vty 0 4
login
line vty 5 9
login
!
end
--------------------------------------------------------------------------------command completed.
--------------------------------------------------------------------------------

 

[seanwest]

and this is my "sho int"

i only show the ports in use.

VLAN1 is up, line protocol is up
Hardware is CPU Interface, address is 0030.9480.4b80 (bia 0030.9480.4b80)
Internet address is 64.62.146.36/27
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
Encapsulation ARPA, loopback not set, keepalive not set
ARP type: ARPA, ARP Timeout 00:08:20
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 3000 bits/sec, 10 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
3161917 packets input, 191236680 bytes, 0 no buffer
Received 3135875 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 21634 ignored, 0 abort
0 input packets with dribble condition detected
26207 packets output, 6870099 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
FastEthernet0/1 is up, line protocol is up
Hardware is Fast Ethernet, address is 0030.9480.4b81 (bia 0030.9480.4b81)
Description: Netscreen
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 41/255
Encapsulation ARPA, loopback not set, keepalive not set
Full-duplex, 10Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:01, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 212000 bits/sec, 215 packets/sec
5 minute output rate 1633000 bits/sec, 254 packets/sec
62099830 packets input, 1779994807 bytes, 0 no buffer
Received 3133521 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 175 ignored, 0 abort
0 watchdog, 0 multicast
0 input packets with dribble condition detected
73704753 packets output, 3662853373 bytes, 0 underruns
0 output errors, 0 collisions, 3 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out


FastEthernet0/4 is up, line protocol is up
Hardware is Fast Ethernet, address is 0030.9480.4b84 (bia 0030.9480.4b84)
Description: Server 1
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
Encapsulation ARPA, loopback not set, keepalive not set
Full-duplex, 10Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 128000 bits/sec, 77 packets/sec
5 minute output rate 67000 bits/sec, 91 packets/sec
20606413 packets input, 636840039 bytes, 0 no buffer
Received 1345 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 77 ignored, 0 abort
0 watchdog, 0 multicast
0 input packets with dribble condition detected
25160030 packets output, 2433961784 bytes, 0 underruns
34 output errors, 295 collisions, 3 interface resets
0 babbles, 34 late collision, 254 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out


FastEthernet0/10 is up, line protocol is up
Hardware is Fast Ethernet, address is 0030.9480.4b8b (bia 0030.9480.4b8b)
Description: Server 2
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
Encapsulation ARPA, loopback not set, keepalive not set
Full-duplex, 10Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:01, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 1204000 bits/sec, 132 packets/sec
5 minute output rate 61000 bits/sec, 93 packets/sec
42721724 packets input, 3038291183 bytes, 0 no buffer
Received 10482 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 39 ignored, 0 abort
0 watchdog, 0 multicast
0 input packets with dribble condition detected
33875166 packets output, 3219018357 bytes, 0 underruns
74 output errors, 2878 collisions, 3 interface resets
0 babbles, 74 late collision, 1086 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out


FastEthernet0/16 is up, line protocol is up
Hardware is Fast Ethernet, address is 0030.9480.4b91 (bia 0030.9480.4b91)
Description: Server 3
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
Encapsulation ARPA, loopback not set, keepalive not set
Full-duplex, 10Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 326000 bits/sec, 46 packets/sec
5 minute output rate 28000 bits/sec, 38 packets/sec
12003926 packets input, 1353198943 bytes, 0 no buffer
Received 8963 broadcasts, 1093 runts, 0 giants, 0 throttles
25705 input errors, 13264 CRC, 12441 frame, 0 overrun, 18 ignored, 0 abort
0 watchdog, 0 multicast
0 input packets with dribble condition detected
12392986 packets output, 1303102043 bytes, 0 underruns
0 output errors, 0 collisions, 3 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out

FastEthernet0/21 is up, line protocol is up
Hardware is Fast Ethernet, address is 0030.9480.4b97 (bia 0030.9480.4b97)
Description: Server 4
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 2/255
Encapsulation ARPA, loopback not set, keepalive not set
Full-duplex, 10Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:01, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 6000 bits/sec, 11 packets/sec
5 minute output rate 87000 bits/sec, 21 packets/sec
992934 packets input, 169148153 bytes, 0 no buffer
Received 3712 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 1 ignored, 0 abort
0 watchdog, 0 multicast
0 input packets with dribble condition detected
5123643 packets output, 1440187445 bytes, 0 underruns
0 output errors, 0 collisions, 3 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out


thanks again, a paypal donation will be made to this website and to the person who can fix this problem for me.

Im greatful for the help! thanks again.

Sean

 

[BuckWeet]

You do know that even at idle, the Cat2924 will show high utilization.. Its the way the switch is made. Unplug everything and the lights will stay the same..

Don't ask me why they did it..

BuckWeet

 

[seanwest]

so how do i really know if the switch is creating a problem? i notice problems most in my IRC chat room. lots of peer disconnections.

Thanks
Sean

 

[nickhanc]

I would clear the counters and check for any CRC / FCS errors to occur. Could be a patch lead problem?

 

[baddos]

A 10mbit link can only transfer 1.25mbytes of traffic. 8 bits for evey byte.

 

[seanwest]

baddos, thank you!

 

[CHM1]

I notice you have collisions on ports 4 and 10 : you shoud have zero because the ports are Full Duplex.
More : there is late collisions ie collisions detected after the 512th bit transmitted which should not happen : there's a problem on the line not on the switch : bad cabling, or NIC or NIC driver or NIC configuration (eg parametered Half duplex).
Try to clear counters to see if these collisions always appear or were old ones (when you had other equipment connected on these ports).

 

[oggy1]

SeanWest,
People are getting too carried away, although the reasons are all valid. Look at the basics. Note the ports that are set to 10MB speed, they are also set to full duplex. 10MB/Full duplex is not a standard. Although 100MB/Full duplex is. 10MB/Full duplex will work between Cisco devices (e.g. routers to switches) but not necessarily between switches and NICs. Also, a dead giveaway is the high number of late collisions. These should never happen on a properly configured and setup ethernet lan or interface. Also not very high CRCs and other errors. Those frames are having to be retransmitted again and again. So,
no speed 10, no duplex full on all interfaces, and let autonegotiate do its job. There is no harm in trying this, and I suspect it will resolve some of your performance issues. Chris