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Fiber speed issue

Posted on 2009-05-14
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Last Modified: 2013-11-09
After replacing 2 Intel 510T switches with media converters for the Base-FX fiber to WS-C2950G-48-EI Cisco Catalyst 2950 48 port 10/100 with 2 GBIC slots Enhanced Image using WS-G5484 1000BASE-SX Short Wavelength GBIC (Multimode only).  After replacing the switches the communication is slow when going out over the fiber.  If I put the fiber back on the media converter at both ends it runs faster but my goal is to simplify my inherited wiring closets.  Attached is the port output for each end of the fiber.  One other thing I don't understand is using flowcontrol I told it send and receive on but it shows off for both.

I am new to fiber and to configuring these types of interfaces.  Looking for help as I will be putting more of these in.
BMC-Main1#sh int gi0/2

GigabitEthernet0/2 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet, address is 000c.3104.9fb2 (bia 000c.3104.9fb2)

  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Full-duplex, 1000Mb/s, media type is SX

  input flow-control is on, output flow-control is on

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:19, output 00:00:06, output hang never

  Last clearing of "show interface" counters never

  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 141000 bits/sec, 78 packets/sec

  5 minute output rate 243000 bits/sec, 59 packets/sec

     3067984 packets input, 391669489 bytes, 0 no buffer

     Received 1822338 broadcasts (0 multicast)

     0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog, 1780987 multicast, 0 pause input

     0 input packets with dribble condition detected

     1919871 packets output, 1316572921 bytes, 0 underruns

     0 output errors, 0 collisions, 4 interface resets

     0 babbles, 0 late collision, 0 deferred

     0 lost carrier, 0 no carrier, 0 PAUSE output

     0 output buffer failures, 0 output buffers swapped out
 

BMC-Trailer#sh int gi0/2

GigabitEthernet0/2 is up, line protocol is up

  Hardware is Gigabit Ethernet, address is 000b.fd3e.12f2 (bia 000b.fd3e.12f2)

  Description: Fiber connection to Main

  MTU 1500 bytes, BW 1000000 Kbit, DLY 1000 usec,

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Full-duplex mode, link type is force-up, media type is SX

  output flow-control is unsupported, input flow-control is unsupported, 1000Mb/

s

  input flow-control is on, output flow-control is on

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:00, output 00:00:01, output hang never

  Last clearing of "show interface" counters never

  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 223000 bits/sec, 28 packets/sec

  5 minute output rate 139000 bits/sec, 52 packets/sec

     1914954 packets input, 1314393179 bytes, 0 no buffer

     Received 181576 broadcasts, 0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog, 14342 multicast, 0 pause input

     0 input packets with dribble condition detected

     3062060 packets output, 390945394 bytes, 0 underruns

     0 output errors, 0 collisions, 2 interface resets

     0 babbles, 0 late collision, 0 deferred

     0 lost carrier, 0 no carrier, 0 PAUSE output

     0 output buffer failures, 0 output buffers swapped outquit

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Question by:bruceb2
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LVL 32

Expert Comment

by:harbor235
ID: 24387291


1) keep flow control off on your switches, let your end systems manage the flow, that's what they are supposed to do.

There is no real traffic coming into these switches, input/ouput rates are low. How are you quantifying that perfromance is slow?

harbor235 ;}

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Author Comment

by:bruceb2
ID: 24387430
End user complaints of long waits to open something that is on the other side.  I will try it.
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Expert Comment

by:harbor235
ID: 24387625

Make sure you hard set duplex, speed, turn trunking off, etc ... as well. Remember, it doe snot have to be a network problem, what are the end systems involved doing? Are they overloaded?

harbor235 ;}
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Author Comment

by:bruceb2
ID: 24387803
They are opening and saving files.  Couple questions on the last post.  How do you set duplex on the fiber card?  I don't see a duplex command as an option.  I found that the error:

Full-duplex mode, link type is force-up, media type is SX
  output flow-control is unsupported, input flow-control is unsupported, 1000Mb/
s

Is caused by the speed command.  I tried no speed nonegotiate and it got rid of the error but also disabled the interface.  Can you enlighten on that point?
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Expert Comment

by:harbor235
ID: 24387864

I am referring to the switch configuration only.

GigE interfaces cannot do half duplex so the only mode is Full, you are using short haul GBICS, what is the distance between devices?

Can you post the port configurations?

Oh, are you saying these two switches are connected together via g0/2 interfaces?

harbor235 ;}
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Author Comment

by:bruceb2
ID: 24397233
Dumb question, How do I get the port configs to display?  If it is sh int gi0/2 in enable mode they are above.

Distance is maybe 50 meters.

And yes My fiber runs are connected to Gi0/2 on both switches.  Gi0/1 are my Gigastack cards.

It is taking between 15 and 30 seconds to access resources on the opposite end of the fiber.
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Expert Comment

by:harbor235
ID: 24412584


Can you post a "Show run int g0/2" from both switches.

harbor235 ;}
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Author Comment

by:bruceb2
ID: 24413032
Here is what info I can gather so far:
Main1:
Name : Gi0/2
Administrative Speed: auto
Administrative Duplex: auto
Administrative Auto-MDIX: N/A
Operational Speed: 1000
Operational Duplex: full
Operational Auto-MDIX: N/A

BMC-Main1#sh running-config int gi0/2
Building configuration...

Current configuration : 103 bytes
!
interface GigabitEthernet0/2
 switchport mode trunk
 speed nonegotiate
 channel-group 1 mode on
end

BMC-Main1#sh int gi0/2 capabilities
GigabitEthernet0/2
  Model:                 WS-C2950G-48-EI
  Type:                  1000BaseSX
  Speed:                 1000
  Duplex:                full
  UDLD:                  yes
  Trunk encap. type:     802.1Q
  Trunk mode:            on,off,desirable,nonegotiate
  Channel:               yes
  Broadcast suppression: percentage(0-100)
  Flowcontrol:           rx-(off,on,desired),tx-(off,on,desired)
  Fast Start:            yes
  CoS rewrite:           yes
  ToS rewrite:           yes
  Inline power:          no
  SPAN:                  source/destination
  PortSecure:            Yes
  Dot1x:                 Yes

BMC-Main1#sh int gi0/2 switchport
Name: Gi0/2
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk (member of bundle Po1)
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none

Trailer:
BMC-Trailer#sh running-config int gi0/2
Building configuration...

Current configuration : 131 bytes
!
interface GigabitEthernet0/2
 description Fiber connection to Main
 switchport mode trunk
 no ip address
 speed nonegotiate
end

BMC-Trailer#sh int gi0/2 switchport
Name: Gi0/2
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001

Protected: false

Voice VLAN: none (Inactive)
Appliance trust: none

BMC-Trailer#sh int gi0/2 capabilities
Not available for WAN ports or VLAN interfaces

Not able to do a sh interfaces transceiver properties on Trailer swithch.  Gives me an invalid input detected.
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Expert Comment

by:harbor235
ID: 24414315


BMC-main is part of an Etherchannel group, the other side is not configured that way.

'sh interfaces port-channel 1 etherchannel" on BMC-Main will tell us if other members are configured. If you do not want to use etherchannel then you should clear that part of the config. Could be the problem.


habor235 ;}
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Author Comment

by:bruceb2
ID: 24415234
tried that and still having the same problem.  I noticed by accident that the IOS versions ar a revision or 2 off from each other.  Could that be an issue?  Is there a way to reset just one interface back to default and not the whole switch?
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Accepted Solution

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harbor235 earned 500 total points
ID: 24415654

I would like to see the output from the commands again after the changes, I also noticed one side is set to negoitiate and the other is not. You also have SPAN enabled on BMC-MAIN, turn it off see if that does anything. Not sure about that one but it could depend if you are doing RPAN, remote SPAN, or SPAN.

I would also make sure both sides are set to desireable for trunking mode, hard set everything, no negoitiation should take place.

Explain to me how media converters are being used, the intel switches had 100Mbps interfaces? FX is 100Mbps, you are trying to use the GigE inerfaces on the Cisco switches with a FX converter or without?

Perhaps there is an issue with your spanning-tree setup? Hard to tell, can you post your configs?

harbor235 ;}
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Author Comment

by:bruceb2
ID: 24416298
I have turned it off but will have to see if it did any good in the morning.   Most of our people leave at 2:30.  

Originally all the switches in the company were one model or another Intel when I arrived.  Most were Intel 510T.  We have 2 fibrer runs in the company.  One comes out to the Trailer and the other comes out to our Q/A department.  For the fiber to work with the Intel switches they had to use media converters.  One of my first projects and still going was to address the lack of port density and over complexity of this network so I went looking for a 48 port switch with Fiber capabilities.  The media converters I found would not work with the Cisco GBIC Fiber card cause they would have to dumb it down to 100Mb.  I now have a 2950 at each end of the Main to Trailer run with a WS-G5484 Fiber card.  Just noticed something weird.  When I go to do a sh int gi0/2 transceiver properties on the trailer switch the command is not there.  Let me know what else you need.  My Cisco is really rusty.  I am picking it back up pretty quick but it has been a long time.
BMC-Main1#show running-config int gi0/2

Building configuration...
 

Current configuration : 119 bytes

!

interface GigabitEthernet0/2

 description Fiber connection to Trailer

 switchport mode trunk

 speed nonegotiate

end
 

BMC-Main1#sh int gi0/2 transceiver properties

Name : Gi0/2

Administrative Speed: auto

Administrative Duplex: auto

Administrative Auto-MDIX: N/A

Operational Speed: 1000

Operational Duplex: full

Operational Auto-MDIX: N/A
 

BMC-Main1#sh int gi0/2 switchport

Name: Gi0/2

Switchport: Enabled

Administrative Mode: trunk

Operational Mode: trunk

Administrative Trunking Encapsulation: dot1q

Operational Trunking Encapsulation: dot1q

Negotiation of Trunking: On

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 1 (default)

Voice VLAN: none

Administrative private-vlan host-association: none

Administrative private-vlan mapping: none

Administrative private-vlan trunk native VLAN: none

Administrative private-vlan trunk encapsulation: dot1q

Administrative private-vlan trunk normal VLANs: none

Administrative private-vlan trunk private VLANs: none

Operational private-vlan: none

Trunking VLANs Enabled: ALL

Pruning VLANs Enabled: 2-1001

Capture Mode Disabled

Capture VLANs Allowed: ALL

Protected: false

Unknown unicast blocked: disabled

Unknown multicast blocked: disabled

Appliance trust: none
 

BMC-Trailer#sh running-config int gi0/2

Building configuration...
 

Current configuration : 131 bytes

!

interface GigabitEthernet0/2

 description Fiber connection to Main

 switchport mode trunk

 no ip address

 speed nonegotiate

end
 

BMC-Trailer#sh int gi0/2 switchport

Name: Gi0/2

Switchport: Enabled

Administrative Mode: trunk

Operational Mode: trunk

Administrative Trunking Encapsulation: dot1q

Operational Trunking Encapsulation: dot1q

Negotiation of Trunking: On

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 1 (default)

Administrative private-vlan host-association: none

Administrative private-vlan mapping: none

Operational private-vlan: none

Trunking VLANs Enabled: ALL

Pruning VLANs Enabled: 2-1001
 

Protected: false
 

Voice VLAN: none (Inactive)

Appliance trust: none

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Author Comment

by:bruceb2
ID: 24487763
had to revert back to the media converters to restore speed.  No issues now.  May pursue this issue at a later date.
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Author Closing Comment

by:bruceb2
ID: 31581471
no solution found.  Had to revert to previous configuration per senior mgmt request.
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