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Why Cisco VOIP's link lights solid amber when connected, compared to computers blinking green?

Posted on 2008-06-18
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Last Modified: 2008-07-22
We have several Cisco VOIP's ranging from 7940's-7971's. When we connect them to our switches, which range from Cisco 2950-3750,  the phone's link lights solid amber and the computers blink green. Is there any reason as to why the VOIP phones are able to work but the ports show up as amber. Also checked out the port configuration, they are all running Fast Ethernet, 100mbps, etc. We have a flat network here where every switch is daisy chained to each other. I was wondering if they show up amber because of how slow the network is going, QOS, or something else. Has anyone else seen this issue? Thanks.
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Question by:Majestica
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harbor235 earned 2000 total points
ID: 21821838

When you first attached a device to a switch port spanning tree will take the port through all the spanning tree states to intergrate that port with a vlan. If you want to reduce the time it takes to become active you can use the port-fast feature with identifies this port as a host port not requiring the full spanning tree state transitions.

Amber means the spanning tree is evaluating the port running through the five states for vlan intergration, essentially it ensures that a loop is not being introduced into the spanning tree topology.

spanning tree five states;
blocking
listening
learning
forwarding
disabled


harbor235 ;}

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by:harbor235
harbor235 earned 2000 total points
ID: 21821854

You should have your switches configured like this with minimal daisy chaining

                                           sw1
                                        /    |     \
                                   sw2    |   sw3
                                             |
                                          sw4

You should follow this architecture where possible, you do not want to many layer 2 hops in your network.

harbor235 ;}
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