Cisco Cisco Firepower Management Center 2000 Manuale Tecnico

The devices must be of same software and hardware version.

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The devices must have the same VDB installed.

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The devices must have the same SRU.

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Ensure both Defense Centers have a user account named admin with Administrator
privileges. These accounts must use the same password.

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Ensure that other than the admin account, the two Defense Centers do not have user
accounts with identical usernames. Remove or rename one of the duplicate users account
before you establish high availability.

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Ensure both the devices do not have any Access Control policies with the same name. If there
are two Access Control policies with the same name they both coexist on the DCs. However,
they cannot  get associated with any device.Once you save this policy after adding a target
device , this configuration is rejected with an error as shown in the image:

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Both the Defense Centers must have access to the internet.

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These are the 8 steps to configure High Availability.

Step 1. Confirm that the software and hardware version along with the VDB version and the rule
update version are the same.