In the attachment you can see a drawing of the test i've build. I simulate traffic with an Acterna tester on both sides (this is onlu one session). Between the two 6509's is a port-channel with 2x 1GE.
When i send traffic both the links are used. On Cisco_6509_1 there's output on Gi2/1 en on
Cisco_6509_1 there's output on Gi1/2. When i force a link break the switchover time is between the 500ms en 1s. When i put back the fiber i can see that it only takes about 20ms.
this is a part of the config from the two switches:
Edison is right that the fastest should be On/On. There is no channel negotiation to wait for. However, the negotiation should not cause you a problem. If the link is joining a channel it should not forward until any negotiation is complete anyway, so you will not notice any convergence problem. If the link is leaving a channel by failing, then it will not be able to negotiate anything anyway.
I wonder if you problem is not related to the ether-channel, but more related to the time it takes for the lower layers to detect and report the link failure. I wonder if there is a way to speed that up.
BTW, how are you measuring the convergence time? Is your measurment really measuring what you think it is measuring? Sorry, I know you posted a diagram, but I don't have Visio here.
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