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https://www.cisco.com/c/en/us/support/docs/security-vpn/secure-shell-ssh/4145-ssh.html
Jun 28, 2007 · There are four steps required to enable SSH support on a Cisco IOS router: Configure the hostname command. Configure the DNS domain. Generate the SSH key to be used. Enable SSH transport support for the virtual type terminal (vtys). If you want to have one device act as an SSH client to the other, you can add SSH to a second device called Reed.
https://www.cisco.com/c/en/us/support/docs/security-vpn/secure-shell-ssh/19143-ssh-faq.html
Aug 31, 2016 · Cisco IOS does not support SSH with Blowfish cipher. When an SSH client sends such unsupported cipher, the router displays debug messages mentioned in SSH Client Sends Unsupported (Blowfish) Cipher .
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_usr_ssh/configuration/15-s/sec-usr-ssh-15-s-book/sec-secure-shell-v2.html
The device with which you want to connect must support a Secure Shell (SSH) server that has an encryption algorithm that is supported in Cisco software. Also, you need not enable your device. SSH can be run in disabled mode.
https://www.cisco.com/c/en/us/support/docs/security-vpn/secure-shell-ssh/13881-ssh-cat-switches.html
Jan 19, 2006 · ** There is no support for SSH in 12.1E train for Catalyst 4000 running Integrated Cisco IOS Software. Refer to Encryption Software Export Distribution Authorization Form in order to apply for 3DES. This document assumes that authentication works prior to implementation of SSH (through the Telnet password, TACACS+) or RADIUS.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_usr_ssh/configuration/12-2sx/sec-usr-ssh-12-2sx-book/sec-secure-shell-v2.html
Jul 23, 2017 · The Secure Shell Version 2 Support feature allows you to configure Secure Shell (SSH) Version 2 (SSH Version 1 support was implemented in an earlier Cisco IOS software release). SSH runs on top of a reliable transport layer and provides strong authentication and encryption capabilities.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_usr_ssh/configuration/15-s/sec-usr-ssh-15-s-book/sec-ssh-term-line.html
Jan 26, 2018 · SSH is an application and a protocol that provides secure replacement for the suite of Berkeley r-tools such as rsh, rlogin, and rcp. (Cisco IOS supports rlogin.) The protocol secures the sessions using standard cryptographic mechanisms, and the application can be used similarly to the Berkeley rexec and rsh tools.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_usr_ssh/configuration/15-s/sec-usr-ssh-15-s-book/sec-secure-shell-algorithm-ccc.html
Apr 01, 2015 · A Secure Shell (SSH) configuration enables a Cisco IOS SSH server and client to authorize the negotiation of only those algorithms that are configured from the allowed list. If a remote party tries to negotiate using only those algorithms that are not part of the allowed list, the request is rejected and the session is not established.
https://community.cisco.com/t5/switching/ssh-supported-from-which-ios-version/td-p/717868
SSH needs crypto and so to have SSH support on your switch you need the crypto support in the operating code. So the important variable is not so much what version of code but is what feature set. Support for SSH has been in the code for a pretty good while.
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