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Uplink Cisco to another Cisco goes up and down repeatedly

Posted on 2011-04-26
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Last Modified: 2012-05-11
I have a Cisco 3550-12T that I want to use as my server switch.  I want to uplink it via Copper to my new Cisco SGE2010P.  When I do the port comes up for a second and then goes down and then back up and so on.  How do I establish a solid link between the two?  I'm guessing I need to do some port configs to the 3550-12T  Please help.
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Question by:rpotratz
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Expert Comment

by:lrmoore
ID: 35471692
On the 3550-12T interface, try "no negotiate" command
interface fas 0/12
 no negotiate
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Author Comment

by:rpotratz
ID: 35474767
There is no such command as you listed.

enable
conf t
interface GigabitEthernet 0/10
no negotiate

Invalid input at marker
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Expert Comment

by:lrmoore
ID: 35474792
Sorry about that. Try this:
 conf t
 interface gig 0/10
 switch nonegotiate
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rpotratz earned 0 total points
ID: 35480693
Was a bad cable.  Cable would link a computer but not the switch.  New cable fixed it.  Thanks.  Took 6 hrs with cisco to figure it out.
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Expert Comment

by:lrmoore
ID: 35487141
D'OH! Good rule of thumb, always start with Layer 1..
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Author Closing Comment

by:rpotratz
ID: 35503478
Outside support
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