Multiservice Networking, IPX Networking, and Security - CCIE Routing and Switching Exam Certification Guide - page 569

Example 12-6 Configuration of IPX RIP
hostname RouterA
!
ipx routing
!
interface ethernet 0
ipx network 10
!
interface ethernet 1
ipx network 11
!
interface serial 0
ipx network aa
!
interface serial 1
ipx network a0
!
ipx router rip
NLSP
IPX RIP and SAP each produce periodic broadcasts every 60 seconds, which adds significant
traffic to the network. NLSP is a link-state protocol that is designed to overcome the limitations
of IPX RIP/SAP. NLSP has characteristics similar to other link-state protocols. Link-state
PDUs (LSPs) are generated by routers and are flooded throughout the network. Each router
receives the LSPs and independently computes best paths to destinations. Updates are sent only
when changes occur. NLSP is based on the OSI Intermediate System-to-Intermediate System
(IS-IS) routing protocol.
NLSP also supports up to 127 hops and permits hierarchical routing with area, domain, and
global internetwork components. An area is a collection of connected networks with the same
area address, and a domain is a collection of areas. A global internetwork is a collection of
domains.
Novell's NLSP specification defines Level 1, Level 2, and Level 3 routers. Level 1 routers
connect networked systems within a given routing area. Areas connect to each other by Level 2
routers, and domains connect by Level 3 routers. A Level 2 router also acts as a Level 1 router
within its own area; likewise, a Level 3 router also acts as a Level 2 router within its own
domain. Cisco's implementation of NLSP implements only Level 1 routing.
NLSP supports hierarchical addressing, in which each area is identified by a 32-bit address and
a 32-bit mask. This is similar to the masking in IP addressing. The mask helps identify the
network address for an area. For example, consider the address of 00705A00 with a mask of
FFFFFF00. With this mask, the first 24 bits of the address identify the area. For this example,
the area is 00705A and the remaining 8 bits are set aside for networks within this area.