Multi-area OSPF and summarization

Objectives

The simulator ticks each one as soon as the network meets it.

1. R1: OSPF 1, all interfaces in area 1.
2. R2 (ABR): G0/1 in area 1 and G0/0 in area 0.
3. R3: all interfaces in area 0.
4. Confirm R3 learns area 1 networks as O IA routes.
5. On R2, summarize area 1 as 172.16.0.0/16 (area 1 range).
6. Ping PC2 from PC1.