3Com 8800 Configuration Manual page 205

3Com Switch 8800 Configuration Guide
ES
IS
Figure 20-1 IS-IS topology
ES
IS
ES
IS
ES
ES
Area 1
Routing Domain Boundary
IS-IS Area
End system
Intermediate system
Subnetwork Path
Interdomain Routing
Level 1 IS-IS Routing
Chapter 20 Integrated IS-IS Configuration
IS
IS IS
Area 2
Routing Domain 1
Routing Domain 2
IS
ES
20-3
IS ES
IS
Area 3
IS
ES ES
Level 2 IS-IS Routing