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Webcast-Catalyst9k
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How to use the Loopback address for devices added to ACS

Looking for the command to use the loopback address as the network ID for ACS. Is there a command you can configure on the switch/router to do this? Currently we fail authentication based off the p2p address connecting the device.

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New Member

Re: How to use the Loopback address for devices added to ACS

There is not way to tell the ACS server to use the loopback address, you will need to tell each device what address to use for TACACS. Basically a Cisco device uses the egress interface as the source address for a packet.

Add this command to each and every device that uses a loopback address

ip tacacs source-interface Loopback0

This tells the device to use whatever interface you specify as the source address for TACACS. On a switch that has multiple L3 Vlans pick one of the Vlans.

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