BGP 路径属性类型 18 指的是什么?
有谁知道路径属性类型18指的是什么以及如何解析它? 我能理解的最好的情况是,它是一个新的 AGGREGATOR(类型 7),我假设它正在读取新的 AS32 格式,但这并没有削减它,因为我无法解析这个数据包。 是否有 RFC 描述其工作原理...CISCO 或其他网络供应商引入了哪些特殊功能?
Does anyone know what Path Attribute Type 18 refers to and how to parse it? The best I can understand is that it is a new AGGREGATOR (type 7) and I'm assuming that it's reading the new AS32 format, but that's not cutting it because I can't parse this packet. Is there an RFC that describes how this works...is it something special that CISCO or another network vendor introduced?
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是的,您是对的:属性 18 是 RFC 4893 中描述的 AS4_AGGREGATOR。它携带 4 个八位字节的 AS 编号。 我见过 Cisco 和 Juniper 路由器生成的具有该属性的更新,但从未注意到 RFC 中不清楚的任何异常情况。 如果您发布了该数据包的十六进制转储,这给您带来了麻烦,我可以尝试为您解码......
Yes, you are correct: attribute 18 is AS4_AGGREGATOR which is described in RFC 4893. It carries a 4-octet AS number. I have seen UPDATEs with that attribute generated by Cisco and Juniper routers and never noticed anything unusual that isn't clear from the RFC. If you post a hex-dump of that packet which is giving you trouble I could attempt a decode for you...