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Switch:  Amber Light

Posted on 2007-03-26
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Last Modified: 2008-02-01
Hello Experts,

I have a port on one of my Catalyst switch that is amber in color.  This port is also an uplink port.  Actually, their are two ports that are uplink and one of them has the amber light.  Does this mean that one of the ports are bad or is it just in stand by?


As always, thank you!
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Question by:coperator
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by:The_Kirschi
ID: 18812060
On cisco switches it is very likely that the port was put into blocked state by the spanning-tree protocol to prevent loops. As you have more than one uplink it is almost certain.
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by:coperator
ID: 18812699
Kirschi,

If that is the case, can it be unblock?  What possible reason as to why the switch would block a port?  
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The_Kirschi earned 2000 total points
ID: 18813991
I am not sure if you could do this manually. But it should not be unblocked. As I mentioned above this is by design to prevent packets from looping around in your network and never reach the intended recipient. Ports will be put into blocking state if there are multiple routes from a source to a destination. Switches would get confused otherwise and may create loops. Its ok to have multiple links for redundancy in case one of the links fails but spanning-tree will always care (hopefully) that no loops occur and thus puts one or more ports into blocking state so no packets will be transmitted over the links on these ports.

It is not an easy topic but I hope you understand what I tried to explain.
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