NSAP Structure of IS-IS
Routing Protocol
Figure 87 IS-IS topology
ES
IS
ES
IS
ES
ES
Routing Domain Boundary
IS-IS Area
ES
End system
Intermediate system
IS
Subnetwork Path
Interdomain Routing
Level 1 IS-IS Routing
Address structure
Figure 88 NSAP structure
IDP
AFI
IDI
Area Address
IS
IS
Area 1
Routing Domain 1
Routing Domain 2
DSP
High Order DSP
SyStem ID
Introduction to Integrated IS-IS
IS
IS
Area 2
Area 3
IS
IS
ES
ES
Level 2 IS-IS Routing
SEL
(1 octet)
341
ES
IS
ES