Review:
Distance Vector Protocols
sending trigger update
1. interface state change (up or down)
2. add or remove static route
3. reachablility change (resume or lose)
All of above -- change of routing table

20111128 Link State
10.1.3.1 Link State Process
10.1.4.2
Like State: interface state
1. IP address and subnet mask
2. type of network (broadcast, point-to-point, etc.)
3. cost
4. neighbor info

subnet mask 255.255.255.224
wildcard mask 255.255.255.255-255.255.255.224=0.0.0.31