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secondary TACACS

Does Cisco ACS require a purchased license?

If so,

We have an existing ACS for our TACACS authentication, can you legally use the same license for a backup ACS server?

Can you set up multiple ACS servers like Primary/Secondary?

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Re: secondary TACACS

You need a licence for each ACS server you run. Read the licence agreement.

Yes you can set up primary, secondary, tertiary, ACS servers. You will want to set up one as the "master" repository for all authentication profiles, users, etc and have it replication with the others so you maintain consistancy of data.

Please be aware that IOS processes the AAA server entries sequentially and not in parallel.

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