After checking the routing as mentioned by David. Also, check to make sure if there is any permit list configured on the switch and if so, make sure that the subnet that you are sourcing the telnet traffic from is allowed in the permit list.
Cat6509> (enable) set ip permit 10.1.1.0 255.255.255.0 telnet
10.1.1.0 with mask 255.255.255.0 added to Telnet permit list.
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...