I recently setup my main switches and routers to use RADIUS for Telnet sessions and am seeing something odd. There is a user being passed from SC0 of a 6509 switch called "azbycx" to RADIUS but is being denied of course. This happens every 5 minutes. I have done a capture on both SC0 via a SPAN as well as the entire VLAN the SC0 is on and all I see is the traffic to and from the RADIUS server. There is nothing external trying to connect.
This is a known 'feature' with CatOS. It is a Radius Keepalive and by default it is enabled and set to 5-minutes. This results in your switch sending a Radius request to all configured Radius servers with the username 'azbycx' every 5-minutes to determine if the servers are 'Dead' or 'Active'.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...