路由器收到包含如下属性的两条BGP路由,根据BGP选路规则,( )。
- A.最优路由M,其AS-Path比N短
- B.最优路由N,其MED比M小
- C.最优路由随机确定
- D.local-preference值为空,无法比较
正确答案及解析
正确答案
解析
BGP选路原则比较复杂,共13条原则:
1、下一跳可达。
2、比较协议首选值Pref_Val,数值高优选,本地始发和邻居传递过来的都为0。该属性本路由器有效,是华为私有属性。
3、local-pref本地优先级高的路由,该参数在本AS内传递。
4、优选聚合路由。
5、优选AS路径短的路由。
6、比较路由起源属性,IGP(0)>EGP(1)>Incomplete(3)
7、优选MED值低的路由,相当于度量值。
8、依次选择从EBGP、联盟、IBGP学来的路由。
9、优选下一跳度量值最低的路由。
10、优选Cluster_list长度最短的路由。
11、优选Originator-ID最小的路由。
12、优选Router-id最小的路由器发布的路由。
13、优选地址最小对等体发布的路由。
本题答案选择A。
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