某局点dot1x认证用户认证成功后，过一段时间认证成功的终端会掉线

现场采用了dot1x结合mac认证的组合方案，用户通过dot1x进行认证，哑终端通过mac地址进行认证，接口下 dot1x跟 mac认证同时开启。

dot1x认证用户认证成功后，过一段时间日志会显示mac地址认证失败且认证成功的终端会掉线 。  

%Jan 11 21:39:07:516 2013 BJFD-F04-10.33.192.10 IFNET/5/LINK_UPDOWN: Line protocol on the interface GigabitEthernet1/0/11 is up.

 %Jan 11 21:39:07:843 2013 BJFD-F04-10.33.192.10 DOT1X/6/DOT1X_LOGIN_FAILURE: -IfName=GigabitEthernet1/0/11-MACAddr=d8cb-8a96-af42-VLANId=22-UserName=host/***.***; The user failed the 802.1X authentication. 

%Jan 11 21:39:07:848 2013 BJFD-F04-10.33.192.10 MACA/6/MACA_LOGIN_FAILURE: -IfName=GigabitEthernet1/0/11-MACAddr=d8cb-8a96-af42-VLANId=22-UserName=d8cb8a96af42-UserNameFormat=MAC address; The user failed the MAC address authentication. 

%Jan 11 21:40:11:873 2013 BJFD-F04-10.33.192.10 DOT1X/6/DOT1X_LOGIN_SUCC: -IfName=GigabitEthernet1/0/11-MACAddr=d8cb-8a96-af42-VLANId=22-UserName=liyuxuan003; The user passed 802.1X authentication and got online successfully.

 %Jan 11 21:40:52:222 2013 BJFD-F04-10.33.192.10 DOT1X/6/DOT1X_LOGOFF: -IfName=GigabitEthernet1/0/11-MACAddr=d8cb-8a96-af42-VLANId=22-UserName=host/***.***-ErrCode=4; Session of the 802.1X user was terminated. 

%Jan 11 21:40:52:226 2013 BJFD-F04-10.33.192.10 MACA/6/MACA_LOGIN_FAILURE: -IfName=GigabitEthernet1/0/11-MACAddr=d8cb-8a96-af42-VLANId=22-UserName=d8cb8a96af42-UserNameFormat=MAC address; The user failed the MAC address authentication.

从日志信息中，可以发现dot1x认证成功后，过了一段时间会提示errcode=4（重认证失败），dot1x会话终止，此时认证的用户名已经发生了改变，之后用户进行mac地址认证失败，用户下线。从日志看，造成用户下线的主要原因是重认证的时候，用户信息发生了改变后导致的。但是进行重认证的原因没有找到，现场改成端口安全部署后，交换机上显示认证上来了，终端电脑显示验证失败，但是已经可以上网了。还是会出现掉线现象。

此时开启端口，触发认证过程的日志信息显示如下：

%Jan 12 04:19:00:699 2013 BJFD-F04-10.33.192.10 IFNET/3/PHY_UPDOWN: GigabitEthernet1/0/7 link status is up.

%Jan 12 04:19:00:702 2013 BJFD-F04-10.33.192.10 IFNET/5/LINK_UPDOWN: Line protocol on the interface GigabitEthernet1/0/7 is up.

%Jan 12 04:19:05:374 2013 BJFD-F04-10.33.192.10 DOT1X/6/DOT1X_LOGIN_SUCC: -IfName=GigabitEthernet1/0/7-MACAddr=1c1b-0d02-99dc-VLANId=22-UserName=lianjia\shilei03; The user passed 802.1X authentication and got online successfully.

%Jan 12 04:36:28:548 2013 BJFD-F04-10.33.192.10 DOT1X/6/DOT1X_LOGOFF: -IfName=GigabitEthernet1/0/7-MACAddr=1c1b-0d02-99dc-VLANId=22-UserName=lianjia\shilei03-ErrCode=9; Session of the 802.1X user was terminated.

%Jan 12 04:36:34:574 2013 BJFD-F04-10.33.192.10 MACA/6/MACA_LOGIN_FAILURE: -IfName=GigabitEthernet1/0/7-MACAddr=1c1b-0d02-99dc-VLANId=22-UserName=1c1b0d0299dc-UserNameFormat=MAC address; The user failed the MAC address authentication.

可以发现此时日志提示ErrCode=9握手失联，dot1x会话终止，那么触发重认证，用户下线的原因是和终端握手不成功导致的。

检查了配置发现有如下定时器的配置

dot1x timer handshake-period 60

dot1x timer supp-timeout 10

dot1x timer tx-period 10

让现场将dot1x定时器删除，在接口下关闭握手功能后问题解决