alias with parameters

In your particular case edit ~/.ssh/config (See Dave's answer below), or use:

alias ssh_nokia='ssh -l root'

Generally

ssh_nokia() {    ssh root@"$@"}

is equivalent to alias (will produce ssh root@1stparam 2ndparam 3rdparam …).

linux shell zsh

I would use up ~/.ssh/config to create an alias for a particular connection, like so:

Host=anyoldnameHostname=[hostname or ip address]User=root

Then you can:

$ ssh anyoldname

More info:

$ man ssh_config

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