交换机

acl部分

acl number 3887

 description locl2local

 rule 10 permit ip source 10.39.0.0 0.0.255.255 destination 10.39.0.0 0.0.255.255

acl number 3888

 description yidong

 rule 9 permit ip source 10.39.99.0 0.0.0.255 destination 10.0.0.0 0.255.255.255

 rule 10 permit ip source 10.39.230.0 0.0.0.255 destination 10.0.0.0 0.255.255.255

 rule 11 permit ip source 10.39.231.0 0.0.0.255 destination 10.0.0.0 0.255.255.255

 rule 12 permit ip source 10.39.232.0 0.0.0.255 destination 10.0.0.0 0.255.255.255

acl number 3999

 description dianxin

 rule 9 permit ip source 10.39.66.0 0.0.0.255 destination 10.0.0.0 0.255.255.255

 rule 10 permit ip source 10.39.100.0 0.0.0.255 destination 10.0.0.0 0.255.255.255

 rule 11 permit ip source 10.39.102.0 0.0.0.255 destination 10.0.0.0 0.255.255.255

 rule 12 permit ip source 10.39.105.0 0.0.0.255 destination 10.0.0.0 0.255.255.255

 rule 13 permit ip source 10.39.104.0 0.0.0.255 destination 10.0.0.0 0.255.255.255

 rule 14 permit ip source 10.39.107.0 0.0.0.255 destination 10.0.0.0 0.255.255.255

policy-based-route yidong permit node 10                                       

 if-match acl 3887                                                                调用3887什么意思

policy-based-route yidong permit node 15

 if-match acl 3888                                                              调用3888什么意思

 apply ip-address next-hop 10.39.65.5

#                                                                                   是先匹配3887在匹配3888吗   ，扔到吓一跳到10.39.65.5

policy-based-route dianxin permit node 20                      

 if-match acl 3887                                                            调用3887什么意思

policy-based-route dianxin permit node 25

 if-match acl 3999                                                             调用3999什么意思

 apply ip-address next-hop 10.39.65.1 

以上acl 和策略路由没看明白，请大神给我分析一下以上策略路由是什么意思实现的什么功能？？？？？？？？？？