[c-nsp] Weird 2950 Issue

[Paul Stewart]

Hi there..

We have a 2950 that is randomly dropping a GigE connection ... this GigE
is pretty new and there's a another working GigE on the switch working
perfectly....

The GigE connects via multimode fiber to an Optera Metro 3500 for
backhaul to a Cisco 6509 switch.  The GigE drops for almost exactly 5
seconds before restoring service which is the part that is "funny".....
I am thinking of swapping the GBIC but wanted to eliminate other options
first....

Oct 29 10:32:15: %LINEPROTO-5-UPDOWN: Line protocol on Interface
GigabitEthernet0/1, changed state to down
Oct 29 10:32:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface
GigabitEthernet0/1, changed state to up
Oct 29 10:32:50: %LINEPROTO-5-UPDOWN: Line protocol on Interface
GigabitEthernet0/1, changed state to down
Oct 29 10:32:55: %LINEPROTO-5-UPDOWN: Line protocol on Interface
GigabitEthernet0/1, changed state to up
Oct 29 10:33:25: %LINEPROTO-5-UPDOWN: Line protocol on Interface
GigabitEthernet0/1, changed state to down
Oct 29 10:33:30: %LINEPROTO-5-UPDOWN: Line protocol on Interface
GigabitEthernet0/1, changed state to up


Config:

interface GigabitEthernet0/1
 description GigE to XXXXXXXXXXX
 switchport trunk native vlan 13
 switchport trunk allowed vlan 13,55,56,58,999
 switchport mode trunk
 no ip address
 no cdp enable


Any have any thoughts? ;)

Thanks,

Paul Stewart
Network Administrator
Nexicom Inc.
http://www.nexicom.net/