加上LSA的头(head)结构

Type : Router                                /*LSA的类型*/
ls id : 1.1.1.1                              /*LSA的标识*/
adv rtr : 1.1.1.1                            /*生成该LSA的路由器*/
ls age : 4                                   /*本条LSA的老化时间*/
len : 108                                    /*LSA的长度*/
seq# : 80000001                              /*LSA的序列号*/
cksum : 0x3543                               /*较验和*/
Link count: 7                                /*本LSA中包含的连接个数*/