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Cheatography

OSPF

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Key Attributes

Type
IGP
Metrics
Cost
Protocol Type/Class
Link State/­Cla­ssless
Algorithm
SPF (Dijis­khtra)
AD
110
Load Balancing
4 equal cost path (CEF)
IP Protocol
89
Summar­ization
Manual (VLSM)
Updates
Increm­ent­al/­Tri­ggered

Packet Types

Hello
Discover directly connected neighbor. Elect DR/BDR in BMA/NBMA. Contains - RID/Area ID/Tim­er/­Aut­hen­tic­ation Type/P­rioriy. For Broadcast & P2P links - Sent as multicast. For NBMA - Sent as Unicast. Timer - 1) For Broadcast & P2P - 10 Sec/40 Sec 2) For NBMA - 30 Sec/120 Sec