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тАО08-31-2006 02:09 AM
тАО08-31-2006 02:09 AM
STP and LACP issues
One of our switches has RSTP enabled and passive LACP enabled (I believe passive LACP is the default setting). If I disable STP on the switch, I lose connectivity. Why would this occur? I can understand enabling STP causing a temporary blocking state, but it is my assumption that disabling STP should not cause any blocking. Is the loss of connectivity somehow caused by LACP?
Also, in some instances, LACP will correctly configure itself on a pair of HP switches when two cables are attached. In some cases it will not. Does anyone know why LACP might automatically configure itself only some of the time?
What I'd like to do is disable STP and LACP on all ports, then go back and manually configure active LACP on the ports that require it.
Sometimes, after configuring active LACP on one port, I lose connectivity to the switch. Has anyone else experienced this?
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тАО08-31-2006 02:11 AM
тАО08-31-2006 02:11 AM
Re: STP and LACP issues
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тАО09-01-2006 06:00 AM
тАО09-01-2006 06:00 AM
Re: STP and LACP issues
Usually, LACP requires full-duplex (FDx) links of the same media type (10/100/1000Base-T).
For RSTP, its recomended to configure all ports not connected to another switches to be Edge Port : "spanning-tree [port list] edge-port".
Now for what you asked "Does anyone know why LACP might automatically configure itself only some of the time?"
Do you have any Trunk configured between the switches ? do you use Dynamic LACP ?
Good Luck !!!
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тАО09-01-2006 08:28 AM
тАО09-01-2006 08:28 AM
Re: STP and LACP issues
On some switches, connecting two identical links to an identical switch causes the LACP trunk to form automatically. Other times it does not. Also, in some instances, after enabling active LACP on one port, I lose connectivity.
I'm going to disable STP completely as it isn't useful with our current topology. I also plan to disable passive LACP on every port and actively enable it on the necessary ports.
I was hoping someone might have an explanation for why connectivity is lost when STP is disabled, and also why connectivity is lost when one LACP link is manually activated.
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тАО09-01-2006 06:33 PM
тАО09-01-2006 06:33 PM
Re: STP and LACP issues
Attach the config of your switches, that will be helpful to understand your scenario, and whats going on.
Enable Syslog on 5300, and dump its messages to a Syslog server, then try to do some debug so it may be clear to you what going on from the messages you see.
Good Luck !!!