No IP Telnet Comport Enable Command

[p.mchenry1@snhu.edu]

Hi,

Trying to understand what this command is stopping exactly. I've looked through some documentation, but not understanding the purpose of it completely. Can someone give an explanation on what "no ip telnet comport enable" is disabling? And, if it is relevant on 9300 switches in a modern network?  

Thank you, Pat

[Mark Elsen]

 - Ref : https://www.cisco.com/c/en/us/td/docs/ios/dial/command/reference/dia-cr-book/dia_i1.html
 >...

ip telnet comport

To enable the Cisco IOS Telnet server to use the RFC 2217 Com Port extensions, use the ip telnet comport command in global configuration mode. To disable RFC 2217 Com Port extensions, use the no form of this command.

ip telnet comport { disconnect delay seconds | enable | flow level number-of-characters | receive window window-size }

no ip telnet comport enable

M.

[p.mchenry1@snhu.edu]

Thank you, M. I've read this article before and I was assuming the com port was related to serial interfaces and creating dialers, but how would these interfaces and features be related to a 9300 access layer switch...if at all? Is it a security measure? If so, what would it be securing?
Thanks again, Pat

[Nicole Hudson]

Based on rfc2217 ip telnet comport enable allows you to access console ports over the network using telnet. For my networks I kept no ip telnet comport enable in my configuration to turn off this function. 

I would classify this as a security measure since it disables the ability to use telnet for remote connections to the console port. 

Here is the link for RFC 2217 for more information: RFC 2217: Telnet Com Port Control Option