Juniper IGP - CONFIGURATION GUIDE V11.1.X, Configuration Manual

Page: 351 / 454

Table 13: IS-IS Terms (continued)
Meaning Term
ISO network addresses used by CLNS networks; an identifier of a
network entity in an end system or intermediate system. A NET
consists of an area address (routing domain), system identifier,
and selector. network entity title (NET)
Hierarchical network address that specifies the point at which
network services are made available to a transport layer entity in
the OSI reference model. A valid NSAP address is unique and
unambiguously identifies a single system. network service access
point (NSAP)
PDU sent by designated router to acknowledge and request
link-state information partial sequence number
PDU (PSNP)
OSI term equivalent to packet, containing protocol control
information and, possibly, user data. This chapter uses the term
packet interchangeably with PDU. protocol data unit (PDU)
A numeric value assigned to the IP addresses on an IS-IS route
before the route is propagated to other routers in an IS-IS domain.
You can use this tag to control IS-IS route redistribution, route
leaking, or route summarization by referencing it in a route map. route tag
A collection of connected areas that provide full connectivity to all
end systems located within them. A routing domain is partitioned
into areas. routing domain
Uniquely identifies a system within an area system identifier
A mechanism for applying a route map to an IS-IS route as a way
to filter and manipulate route attributes before the route is added
to the routing table. table map
Figure 18 on page 327 illustrates some of the terms described in Table 13 on page 326.
Figure 18: Overview of IS-IS Topology
Overview
■ 327
Chapter 6: Configuring IS-IS