Juniper IGP - CONFIGURATION GUIDE V11.1.X Configuration Manual page 267

Table 9: OSPF-Related Terms (continued)
Term Meaning
authentication type The method by which authentication is achieved null (or none),
simple, or MD5. For example, simple authentication requires a 64-bit
password in each OSPF packet.
autonomous system A set of networks or IP prefixes within a single routing policy domain.
(AS)
autonomous system An OSPF router that redistributes routing information from other
boundary router (AS routing protocol sources.
boundary router)
classless interdomain An addressing method that replaces the traditional class structure of
routing (CIDR) IP addresses. In CIDR, the boundary between the network and host
portions of an IP address can be on any bit boundary. CIDR addresses
have no class restrictions, enabling more efficient used of the IP
address space. CIDR addresses are represented by a prefix and a
notation that indicates the IP address and mask; for example,
10.12.8.3/16.
designated router A designated device (OSPF router) with which other routers form
adjacencies, reducing the number of adjacencies required on a
broadcast or NBMA network.
domain A collection of routers that use a common interior gateway protocol.
flooding The distribution and synchronization of the link-state database between
OSPF routers.
hello protocol A protocol that establishes and maintains neighbor relationships and
that communication between neighbors is bidirectional. The hello
protocol also dynamically discovers neighboring routers on broadcast
or point-to-point networks.
interior gateway A routing protocol that routers within an AS use to exchange
protocol (IGP) information.
link-state advertisement A unit of data that describes the local state of a router or network.
(LSA) LSAs are flooded throughout their respective flooding domains. For
example, router LSAs are flooded within the area to which the router
belongs, summary LSAs are flooded to other areas through the
backbone, and external LSAs are flooded throughout the OSPF domain.
Chapter 5: Configuring OSPF
243
Overview