思科网络实验（34）——BGP的十三条选路原则
作者：互联网
consider only （synchronized）routers with no AS loops and a vaild next hop ，and then：
1.prefer hightest weight（local to router）
2.prefer hightest local preference （global within AS）
3.prefer router originated by the local router （next hop = 0.0.0.0）
4.prefer shortest AS path
5.prefer lowest origin code （IGP>EGP>incomplete）
6.prefer lowest MED（exchanged between autonomous systems）
7.prefer EBGP path over IBGP path
8.prefer the path through the closest IGP neighbor
9.如果配置了maximum-path【ibgp】，如果存在多条等价的路径，会插入多条路径
10.prefer oldest route for EBGP paths
11.prefer the path with lowest neighbor BGP router ID
12.多条路径的始发路由器ID相同，那么选择CLUSTER_LIST长度短的
13.prefer the path with the lowest neighbor IP address
标签：lowest,neighbor,prefer,34,BGP,选路,router,path,local 来源： https://blog.csdn.net/hdq1745/article/details/97298402