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Old 04-03-2015, 06:47 AM
jacks232 jacks232 is offline
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Default ERS 4850GTS-PWR+ / TACACS+ Servers Unreachable - Local Authentication Not Working

Hi all,

We are trying to migrate our Avaya 4850GTS-PWR+ switches to our existing Global TACACS+ authentication platform but we are running into difficulties because the Avaya's refuse to do local authentication when the TAC+ servers become unreachable.

They output an error that the global authentication servers are unreachable and continue to prompt for username/password endlessly.

According to the Avaya documentation, this is what is supposed to happen:

"You can configure two TACACS+ servers, a primary server and a secondary server. If all servers are not reachable (no answers) then local authentication is done."

I know that this used to be an issue with RADIUS authentication until the "radius-server password fallback" command was added in later releases.

Are we missing something? Is there a way for us to set a TACACS server timeout value and then force local user/password authentication? The implementation is pretty useless if it cannot fallback to local authentication in the event of a network/TAC+ server outage.

Our configuration is pretty basic:

tacacs server host x.x.x.x key
tacacs authorization enable
tacacs authorization level all
tacacs accounting enable
cli password switch telnet tacacs

The 4850 switches are running FW / SW v5.8.0.005

Many thanks in advance,

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