3750 port disables

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Sep 19th, 2007
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I have a 3750 switch that is been used as a distribution switch. I have a number of vlans on the switch.This switch is connected to a catalyst 6500 switch through ospf. This connection has been in place for about 3 years now without a problem. Lately, the interface on the 3750 (gigabit port,L3) has been giving me sleepless nights. everyday,the port shuts down and i either have to restart the switch or remove the fiber cable and re-insert it before the link comes up. I am at wits-end. Can somebody tell me what could be the problem and suggest how I can get it fix.


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pciaccio Wed, 09/19/2007 - 04:07
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There are several areas to check:

Check your logs to see of any port/interface issues from both sides

Check the port/interface stats for any excessive errors (Both sides)

revalidate your fiber cabling and see that all connectors are snugly in place (maybe someone messed with the cabling).


Do these basic checks and then see what you find... Good Luck...


guruprasadr Wed, 09/19/2007 - 04:08
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Hello,


Do you see some Logs in the Switch during this Incident occurance.


Pls provide us additional INFO to help on this Incident.


Best Regards,


Guru Prasad R

xhackuss1 Wed, 09/19/2007 - 05:15
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Thanks a lot.Below is an output of "show logging"


DSwitch#show logging


Monitor logging: level debugging, 0 messages logged

Buffer logging: level debugging, 114

Log Buffer (4096 bytes):

face GigabitEthernet1/0/26, changed state to up

23:45:51: %OSPF-5-ADJCHG: Process 222, Nbr 10.254.254.1 on GigabitEthernet1/0/26

from LOADING to FULL, Loading Done

23:46:11: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/23,

changed state to down

23:46:12: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/23, changed state to down

23:46:15: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/23, changed state to up

23:46:17: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/23,

changed state to up

1d02h: %OSPF-5-ADJCHG: Process 222, Nbr 10.254.254.1 on GigabitEthernet1/0/26 fr

om FULL to DOWN, Neighbor Down: Dead timer expired

1d15h: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, ch

anged state to down

1d15h: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/26, changed state to down

1d15h: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/26, changed state to up

1d15h: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, ch

anged state to up

1d15h: %OSPF-5-ADJCHG: Process 222, Nbr 10.254.254.1 on GigabitEthernet1/0/26 fr

om LOADING to FULL, Loading Done

1d15h: %PHY-4-EXCESSIVE_ERRORS: Excessive FCS, data, or idle word errors found o

n interface Gi1/0/23

1d18h: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, ch

anged state to down

1d18h: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/26, changed state to down

1d18h: %OSPF-5-ADJCHG: Process 222, Nbr 10.254.254.1 on GigabitEthernet1/0/26 fr

om FULL to DOWN, Neighbor Down: Interface down or detached

1d18h: %SUPERVISOR-3-IIC_INIT: IIC Reinitialized

1d18h: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/26, changed state to up

1d18h: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, ch

anged state to up

1d18h: %PHY-4-EXCESSIVE_ERRORS: Excessive FCS, data, or idle word errors found o

n interface Gi1/0/10

1d18h: %OSPF-5-ADJCHG: Process 222, Nbr 10.254.254.1 on GigabitEthernet1/0/26 fr

om LOADING to FULL, Loading Done

1d18h: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, ch

anged state to down

1d18h: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/26, changed state to down

1d18h: %OSPF-5-ADJCHG: Process 222, Nbr 10.254.254.1 on GigabitEthernet1/0/26 fr

om FULL to DOWN, Neighbor Down: Interface down or detached

1d18h: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/26, changed state to up

1d18h: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, ch

anged state to up

1d18h: %OSPF-5-ADJCHG: Process 222, Nbr 10.254.254.1 on GigabitEthernet1/0/26 fr

om LOADING to FULL, Loading Done

1d18h: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, ch

anged state to down

1d18h: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/26, changed state to down

1d18h: %OSPF-5-ADJCHG: Process 222, Nbr 10.254.254.1 on GigabitEthernet1/0/26 fr

om FULL to DOWN, Neighbor Down: Interface down or detached

1d18h: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/26, changed state to up

1d18h: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, ch

anged state to up

1d18h: %OSPF-5-ADJCHG: Process 222, Nbr 10.254.254.1 on GigabitEthernet1/0/26 fr

om LOADING to FULL, Loading Done

1d19h: %OSPF-5-ADJCHG: Process 222, Nbr 10.254.254.1 on GigabitEthernet1/0/26 fr

om FULL to DOWN, Neighbor Down: Dead timer expired

Awaiting our response

Kevin Dorrell Wed, 09/19/2007 - 06:01
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Is this fiber? If it is 1000BaseSX, try changing the GBICs - they are terribly unreliable. I was told they use the same laser diodes as in cheap CD players, and they deteriorate with age.


It might be something else entirely, of course, but if you have any spare GBICs it is worth a go.


Kevin Dorrell

Luxembourg


xhackuss1 Wed, 09/19/2007 - 06:24
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Thanks a lot Kevin. I will try that and see what's up

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