学习BGP第二天:路径属性
RFC 4271将BGP路径属性分为两大类:公认(Well-known)及可选(Optional)。
公认属性里分了两个子类:
◆强制(Mandatory)
◆自由决定(Discretionary)
可选属性也分了两个子类:
◆传递(Transitive)
◆飞可传递(Non-transition)
综上,BGP路径属性可分为4中类型,每种类型包含的路径属性如下:
(1)公认强制(Well-known Mandatory)
◆Origin
◆AS Path
◆Next Hop
(2)公认自由决定(Well-known Discretionary)
◆Local _Preference
◆Atomic_Aggregate
(3)可选传递(Optional Transitive)
◆Community
◆Aggregator
(4)可选非传递(Optional Non-transitive)
◆MED
◆Originator_ID
◆Cluster_List