1. The primary function of a BGP speaking system is to exchange network reachability information with other BGP systems.
2. RIB: Routing Information Base

1. The internet protocol implements two basic functions:
   • addressing
   • fragmentation
2. The internet modules use the addresses carried in the internet header to transmit internet datagrams toward their destinations. The selection of a path for transmission is called routing.

1. RFC5440[PCEP]
   • Open and Keepalive
   • PCReq
   • PCRep
   • PCNft
   • PCErr
   • Close
2. draft-ietf-pce-gmpls-pcep-extensions-11 不对称业务请求
3. LMP主要用来邻居节点链路发现，OSPF通过洪泛发现拓扑，PCEP discovery(PCED)消息来找到pce位置
4. RFC4657: stateful pce
5. pce-initiation: draft-ietf-pce-pce-initiated-lsp-10 首节点建路
6. pce-ls: draft-dhodylee-pce-pcep-ls-08 取代ospf,但有bgp-ls(RFC7752)
   • The fastest way for a PCE to be updated on TED changes is via a direct interface with each network node and with incremental update from each network node with only the attribute that is modified.
7. pce-cc: draft-ietf-teas-pce-central-control-05 改水平信令(串行发放)为垂直信令(并行发放)
8. Hierarchical-PCE[RFC6805]
9. draft-ietf-pce-applicability-actn-00

1. TE information is not exchanged across the domain boundaries.
2. Motivation of a PCE-Based Architecture
   2.1 CPU-Intensive Path Computation
   2.2 Partial Visibility
3. PCE is not considered to be a solution that is applicable to the entire Internet.

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