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Poor performance with VLANs

Posted on 2004-09-21
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Last Modified: 2012-06-27
Ok, I have my fileserver on VLAN 2 ( 192.168.2.0).  And I have a few users on VLAN3 (192.168.3.0 )

The problem is, copying files from the fileserver is taking FOREVER since I implemented VLANs.
So I configured the switchport the fileserver was on, to be a member of both VLANs.  Didnt seem to help too much.  Any advice?
Thanks
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Question by:dissolved
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14 Comments
 

Author Comment

by:dissolved
ID: 12119530
Here's a sh run

newswitch#sh run
Building configuration...

Current configuration:
!
version 12.0
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname newswitch
!
enable secret (removed)
!
!
!
!
!
!
spanning-tree vlan 1 hello-time 10
no spanning-tree vlan 1
ip subnet-zero
!
!
!
interface FastEthernet0/1
 port security max-mac-count 1
!
interface FastEthernet0/2         -Fileserver on this port
 switchport multi vlan 1,3
!
interface FastEthernet0/3         -VLAN 3 has most of my users
 switchport access vlan 3
!
interface FastEthernet0/4
 switchport access vlan 2
!
interface FastEthernet0/5
!
interface FastEthernet0/6
!
interface FastEthernet0/7
!
interface FastEthernet0/8
!
interface FastEthernet0/9
!
interface FastEthernet0/10
!
interface FastEthernet0/11
!
interface FastEthernet0/12
!
interface FastEthernet0/13
!
interface FastEthernet0/14
!
etc etc etc etc
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Expert Comment

by:lrmoore
ID: 12122311
Where is your L3 routing taking place between the subnets?
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Author Comment

by:dissolved
ID: 12123924
Port 24 is set up as the trunk port.  It goes to a 2600 series router
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Expert Comment

by:lrmoore
ID: 12124140
What's the speed of the trunk port on the router? Is your router setup properly?
Are you getting any error conditions on the trunk port? On the router interface? Use show interface fa 0/24, sho interface fa 0/x


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Author Comment

by:dissolved
ID: 12124346
Wait a minute, I know why it's slow.  The trunk port is only 10mb.  I forgot all about that lol.
Thanks lrmoore.

Here is the sh for that port
newswitch#sh int fa0/24
FastEthernet0/24 is up, line protocol is up
  Hardware is Fast Ethernet, address is 0030.1944.2d58 (bia 0030.1944.2d58)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Auto-duplex (Half), Auto Speed (10), 100BaseTX/FX
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:27, 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 7000 bits/sec, 4 packets/sec
  5 minute output rate 8000 bits/sec, 7 packets/sec
     12470391 packets input, 1496755807 bytes
     Received 101523 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 101420 multicast
     0 input packets with dribble condition detected
     15325599 packets output, 1760765330 bytes, 0 underruns
     0 output errors, 2099707 collisions, 3 interface resets
     0 babbles, 0 late collision, 1095196 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
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Accepted Solution

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lrmoore earned 500 total points
ID: 12124439
Yep. 10M/half duplex...
Half-duplex allows collisions
Collisions cause deferrals
defferals cause reduced performance..
     >  0 output errors, 2099707 collisions, 3 interface resets
     >   0 babbles, 0 late collision, 1095196 deferred

I didn't know it would even let you configure trunking on a half-duplex link....
Older versions of IOS required 100M full-duplex for trunking.
Learn something new every day!
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Author Comment

by:dissolved
ID: 12124915
Thanks man.
yea, with IOS 12.2T and newer, you can trunk the 2600.  Obviously not very well though! lmao
thanks again
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Expert Comment

by:lrmoore
ID: 12125263
The least you can do is set it to full-duplex...

Cheers!
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Author Comment

by:dissolved
ID: 12133846
lrmoore, to set up full duplex, I do a
int e0
full-duplex

Ok, I did it. Do I have to do the "full-duplex" command to my sub-interfaces as well?

Anyway performance is very slow now (slower than before).  Do my switchports have to be set at 10m/full duplex as well? Right now they are on auto sensing.

thanks for any advice!
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Expert Comment

by:lrmoore
ID: 12133904
>Do I have to do the "full-duplex" command to my sub-interfaces as well?

No, just the  major interface

>Do my switchports have to be set at 10m/full duplex as well?
Absolutely! The default behavior of a switch set to autosense drops to half-duplex if the connecting device does not send a negotiation packet. Anytime you hard-code an interface, be it a router, switch or NIC card, and the switch is set to auto, you can be sure that you will end up with a duplex mismatch... hard-setting the duplex turns off the negotiation packet.
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Author Comment

by:dissolved
ID: 12134477
thanks again
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Expert Comment

by:DHildebrand
ID: 12371715
Have you tried setting a default gateway on the switch?

ip default-gateway x.x.x.x
(from config mode)
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Author Comment

by:dissolved
ID: 12372069
this is a layer 2 switch. Would it work ? Can i even set a default gateway?
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Expert Comment

by:DHildebrand
ID: 12373173
I don't see why you would not be able to set a default gateway as long as there is a router in the mix. I would set the default gateway to the Cisco 2600 you mentioned in an earlier post. See if that helps you out.
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