ProCurve 8200zl Uživatelská příručka stáhnout pdf (Strana 212)

IP Routing Features

Configuring OSPF

OSPF Router Types

Interior Routers

This type of OSPF router belongs to only one area. Interior routers flood type-

1 LSAs to all routers in the same area, and maintain identical link state

databases (LSDBs). In figure 5-11, below, routers R1, R3, R4, and R6 are all

interior routers because all of their links are to other routers in the same area.

Area 0 (Backbone)

Area 1

Interior Routers

Interior Router

Figure 5-11. Example of Interior Routers

Area Border Routers (ABRs)

This type of OSPF router has membership in multiple areas. ABRs are used to

connect the various areas in an AS to the backbone area for that AS. Multiple

ABRs can be used to connect a given area to the backbone, and a given ABR

can belong to multiple areas other than the backbone. An ABR maintains a

separate LSDB for each area to which it belongs. (All routers within the same

area have identical LSDBs.) The ABR is responsible for flooding summary

LSAs between its border areas. You can reduce summary LSA flooding by

configuring area ranges. An area range enables you to assign an aggregate

address to a range of IP addresses. This aggregate address is advertised

instead of all the individual addresses it represents. You can assign up to eight

ranges in an OSPF area. In figure 5-12, below, routers R2 and R5 are Area

Border Routers (ABRs) because they both have membership in more than one

area.

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ProCurve 8200zl Uživatelská příručka Strana 212