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MAD Multi-Active

Created: Jun 29, 2020 20:32:26Latest reply: Jun 29, 2020 21:24:48 103 3 1 0
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How does MAD handles a Multi-Active escenario?

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Created Jun 29, 2020 20:35:37 Helpful(0) Helpful(0)

Hi,

After a stack splits, the MAD mechanism sets the new stacks to the Detect or Recovery state. The stack in Detect state still works, whereas the stack in Recovery state is disabled.
MAD handles a multi-active situation as follows: When multiple stacks in Detect state are detected by the MAD split detection mechanism, the stacks compete to retain the Detect state. The stacks that fail in the competition enter the Recovery state, and all the physical ports except the reserved ports on the member switches in these stacks are shut down. The stacks in Recovery state no longer forward service packets.
MAD competition follows similar guidelines to master switch competition.
- The stack that completes its startup first enters the Detect state. If the difference in the time taken for multiple stacks to complete their startup is within 20 seconds, the stacks are considered to complete their startup at the same time.
- When the stacks complete their startup at the same time, the stack in which the master switch has the highest stack priority enters the Detect state.
- When the master switches in the stacks have the same stack priority, the stack with the smallest MAC address enters the Detect state.

After the faulty link recovers, the stacks merge into one in either of the following ways:
- The stack in Recovery state restarts and merges with the stack in Detect state, and the service ports that have been shut down are restored to Up state. Then the entire stack recovers.
- If the stack in Detect state is also faulty before the faulty link recovers, you can remove this stack from the network and start the stack in Recovery state using a command to direct service traffic to this stack. Then rectify the stack system fault and link fault. After the stack recovers, connect it to the network so that it can merge with the other stack.
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Gustavo.HdezF Moderator Created Jun 29, 2020 20:34:07 Helpful(0) Helpful(0)

Hello User. We are reviewing your question and we will anser you shortly. Thanks.
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Herediano Created Jun 29, 2020 20:35:37 Helpful(0) Helpful(0)

Hi,

After a stack splits, the MAD mechanism sets the new stacks to the Detect or Recovery state. The stack in Detect state still works, whereas the stack in Recovery state is disabled.
MAD handles a multi-active situation as follows: When multiple stacks in Detect state are detected by the MAD split detection mechanism, the stacks compete to retain the Detect state. The stacks that fail in the competition enter the Recovery state, and all the physical ports except the reserved ports on the member switches in these stacks are shut down. The stacks in Recovery state no longer forward service packets.
MAD competition follows similar guidelines to master switch competition.
- The stack that completes its startup first enters the Detect state. If the difference in the time taken for multiple stacks to complete their startup is within 20 seconds, the stacks are considered to complete their startup at the same time.
- When the stacks complete their startup at the same time, the stack in which the master switch has the highest stack priority enters the Detect state.
- When the master switches in the stacks have the same stack priority, the stack with the smallest MAC address enters the Detect state.

After the faulty link recovers, the stacks merge into one in either of the following ways:
- The stack in Recovery state restarts and merges with the stack in Detect state, and the service ports that have been shut down are restored to Up state. Then the entire stack recovers.
- If the stack in Detect state is also faulty before the faulty link recovers, you can remove this stack from the network and start the stack in Recovery state using a command to direct service traffic to this stack. Then rectify the stack system fault and link fault. After the stack recovers, connect it to the network so that it can merge with the other stack.
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wissal MVE Created Jun 29, 2020 21:24:48 Helpful(0) Helpful(0)

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