Hi I have lived through a similar situation, however real and very unpleasant. I have in my environment two 4506E with a SUP8 in each. When one SUP8 failed and the other did not assumed, continued as standby. I think the reasons were the VSL link and dual active detect were UPs because Other modules were available, but without management of a SUP. The Forward, did not occur even with redundant link (s) on both chassis.
Any ideas for improvement or problem analysis?
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