谁能帮我解释以下交换机日志的意思。

Logging Buffer Configuration and contents:
enabled
allowed max buffer size : 1024
actual buffer size : 256
channel number : 4 , channel name : logbuffer
dropped messages : 0
overwrote messages : 44
current messages : 256
%Sep 14 11:31:15 2009 CB-KSJY1-HJ-5516 SHELL/5/LOGOUT: VTY logout from 10.100.26
.253
%Sep 14 19:03:39 2009 CB-KSJY1-HJ-5516 SHELL/5/LOGIN: VTY login from 10.100.64.9
9
%Sep 14 19:03:45 2009 CB-KSJY1-HJ-5516 SHELL/5/LOGOUT: VTY logout from 10.100.64
.99
%Sep 14 23:57:25 2009 CB-KSJY1-HJ-5516 SHELL/5/LOGIN: VTY login from 10.100.26.2
53
%Sep 15 14:35:59 2009 CB-KSJY1-HJ-5516 L2INF/5/PORT LINK STATUS CHANGE:
GigabitEthernet1/1: turns into DOWN state

%Sep 15 14:35:59 2009 CB-KSJY1-HJ-5516 L2INF/5/VLANIF LINK STATUS CHANGE:
Vlan-interface740: turns into DOWN state

%Sep 15 14:35:59 2009 CB-KSJY1-HJ-5516 IFNET/5/UPDOWN:Line protocol on the inter
face Vlan-in

这么长一段 还不给分！！！ 真小气！！ 给你解析一小段！！
Logging Buffer Configuration and contents: enabled 启用日志记录
allowed max buffer size : 1024 缓冲区大小：1024
actual buffer size : 256 实际大小 256
加分就继续给你解释

Sep 14 11:31:15 2009 CB-KSJY1-HJ-5516 SHELL/5/LOGOUT: logout from 10.100.26.253
2009年9月14号 11:31:15 10.100.26.253这个地址通过 虚拟终端 （你用的是思科吧）CB-KSJY1-HJ-5516 是你的帐号信息加密过的
%Sep 14 19:03:39 2009 CB-KSJY1-HJ-5516 SHELL/5/LOGIN: VTY login from 10.100.64.9 从10.100.64.9通过虚拟终端登陆

%Sep 15 14:35:59 2009 CB-KSJY1-HJ-5516 L2INF/5/PORT LINK STATUS CHANGE: GigabitEthernet1/1: turns into DOWN state
端口状态被改变： GigabitEthernet1/1被停用

%Sep 15 14:35:59 2009 CB-KSJY1-HJ-5516 L2INF/5/VLANIF LINK STATUS CHANGE: Vlan-interface740: turns into DOWN state
端口状态改变，VLAN740被停用

%Sep 15 14:36:00 2009 CB-KSJY1-HJ-5516 RM/5/RTLOG:Last neighbor down event: ROUTER ID: 172.17.60.251 LOCAL ADDRESS: 172.18.2.42 REMOTE ADDRESS: 172.18.2.41 REAS
ON: Ospf_ifachange