The 7705 SAR supports configurable cipher client and cipher server lists that are used to negotiate the best compatible cipher between the SSH client and SSH server. Each list contains ciphers and their corresponding index values, where a lower index has a higher preference in the SSH negotiation. The list is ordered by preference from highest to lowest. When the client and server exchange their cipher lists, the first cipher in the client list that is also supported by the server is the cipher that is agreed upon.
There are different default ciphers for SSHv1 and SSHv2. See Table: SSHv1 Default Index Values and Table: SSHv2 Default Index Values in the Security Command Reference for the cipher index values and names.
The default list can be changed by manually removing a single index or as many indexes as required using the no cipher index command. The default list can also be customized by first removing an index and then redefining it for each algorithm as required (the 7705 SAR does not support customizing an index without first removing it).