HP 3500YL - Manual (Page 219)

IP Routing Features
Configuring OSPF
Link-State Advertisement (LSA): A message sent by a router to its neigh­
bors to advertise the existence of a route to a destination known by the
originating router. Refer to Table 5-5 on page 5-46.
Normal Area: Exists within an OSPF domain and connects to the backbone
area through one or more ABRs (either physically or through a virtual
link). Supports summary link-state advertisements and external link-state
advertisements to and from the backbone area, as well as ASBRs.
NSSA (Not-So-Stubby-Area): An OSPF area that limits advertisement of
external and summary routes to the backbone area and allows controls
on advertisements entering the area from the backbone. (Refer to “Not-
So-Stubby-Area (NSSA)” on page 5-52.)
Stub Area: An OSPF area that does not allow an internal ASBR or external
type-5 LSAs. (Refer to “Stub Area” on page 5-53.)
Summary Link-State Advertisement: A type-3 LSA summarizing the avail­
able links within an OSPF area. This advertisement is sent by the ABR for
an area to the backbone area for distribution to the other areas in the
OSPF domain. Refer to Table 5-5 on page 5-46. (See also “Link State
Advertisement”.)
Type-3 LSA: See “Summary Link-State Advertisement”.
Type-5 LSA: See “External Type-5 Link State Advertisement”.
Type-7 LSA: See “External Type-7 Link State Advertisement”.
Topological Database: See “Link State Database”.
Virtual Link: Used to provide connectivity from a normal area to the back­
bone when the subject area does not have an ABR physically linked to the
backbone area. Refer to “13. Configuring an ABR To Use a Virtual Link to the
Backbone” on page 5-88.
5-45