Issue with one of the B5G-124-48 stacked switches blocking entire network.

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Hi friends, we have 3 nos. of B5G-124-48 switches staked to a primary IP and another 3 Nos to secondary IP and have been working fine for last 6 months. All of a sudden we noticed network error between all the active components in the network. But when we power down one out of 3 Switches, the network has become okay. When we power it up again same problem surfaced. Can any one help us identify the problem and resolve?
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Rajendra Prasad P

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Posted 4 years ago

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Paul Poyant, Employee

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I suggest that you extract the following materials from the stack, then open a GTAC Support case to review those materials and offer a resolution plan. 
* 'show support' output
* full current.log extracted using the TFTP process outlined in KB 5487 (

If the stack is not sufficiently operative with all three switch units powered up (my impression is that it doesn't matter which unit you power down), then please remove a unit from the stack and run it standalone in order to extract the same list of materials for GTAC review. The upshot is that you'll be passing along either one or two sets of materials from the one or two B5 stacks, and collectively those materials will contain diagnostics from all three B5 units.