ssh agent 配置以后。。第二次ssh登陆还是需要密码。。请教为什么。。

wenqing_9115

　　$ ssh-keygen -t rsa　
　　 Generating public/private rsa key pair.
　　 Enter file in which to save the key (/home/nori/.ssh/id_rsa):　
　　 Enter passphrase (empty for no passphrase):　
　　 Enter same passphrase again:　
　　 Your identification has been saved in /home/nori/.ssh/id_rsa.
　　 Your public key has been saved in /home/nori/.ssh/id_rsa.pub.
　　 The key fingerprint is:
　　 f9:81:b6:c7:8f:b9:aa:3e:0e:c6:bd:35:19:a1:1e:06 nori@pandora

　　$ cat id_rsa.pub >> $HOME/.ssh/authorized_keys
　　$ chmod 600 $HOME/.ssh/authorized_keys
　　$ eval `ssh-agent` 　　
    $ ssh-add

　   
    $ ssh ics02 [yes]　     .ssh/host_name 文件里生成，ics02 的ip内容也添加了。
    然后 exit
    ics01:/etc/ssh[97] ssh is1025@ics02
    is1025@ics02's password:　　
    $ eval `ssh-agent -k`