OSPF area - Untitled

— OSPF Command: area a.b.c.d range a.b.c.d/m
— OSPF Command: area <0-4294967295> range a.b.c.d/m
— OSPF Command: no area a.b.c.d range a.b.c.d/m
— OSPF Command: no area <0-4294967295> range a.b.c.d/m

Summarize intra area paths from specified area into one Type-3 summary-LSA announced to other areas. This command can be used only in ABR and ONLY router-LSAs (Type-1) and network-LSAs (Type-2) (ie. LSAs with scope area) can be summarized. Type-5 AS-external-LSAs can't be summarized - their scope is AS. Summarizing Type-7 AS-external-LSAs isn't supported yet by Quagga.
          router ospf
           network 192.168.1.0/24 area 0.0.0.0
           network 10.0.0.0/8 area 0.0.0.10
           area 0.0.0.10 range 10.0.0.0/8
     
With configuration above one Type-3 Summary-LSA with routing info 10.0.0.0/8 is announced into backbone area if area 0.0.0.10 contains at least one intra-area network (ie. described with router or network LSA) from this range.

— OSPF Command: area a.b.c.d range IPV4_PREFIX not-advertise
— OSPF Command: no area a.b.c.d range IPV4_PREFIX not-advertise

Instead of summarizing intra area paths filter them - ie. intra area paths from this range are not advertised into other areas. This command makes sense in ABR only.

— OSPF Command: area a.b.c.d range IPV4_PREFIX substitute IPV4_PREFIX
— OSPF Command: no area a.b.c.d range IPV4_PREFIX substitute IPV4_PREFIX

Substitute summarized prefix with another prefix.
          router ospf
           network 192.168.1.0/24 area 0.0.0.0
           network 10.0.0.0/8 area 0.0.0.10
           area 0.0.0.10 range 10.0.0.0/8 substitute 11.0.0.0/8
     
One Type-3 summary-LSA with routing info 11.0.0.0/8 is announced into backbone area if area 0.0.0.10 contains at least one intra-area network (ie. described with router-LSA or network-LSA) from range 10.0.0.0/8. This command makes sense in ABR only.

— OSPF Command: area a.b.c.d virtual-link a.b.c.d
— OSPF Command: area <0-4294967295> virtual-link a.b.c.d
— OSPF Command: no area a.b.c.d virtual-link a.b.c.d
— OSPF Command: no area <0-4294967295> virtual-link a.b.c.d

— OSPF Command: area a.b.c.d shortcut
— OSPF Command: area <0-4294967295> shortcut
— OSPF Command: no area a.b.c.d shortcut
— OSPF Command: no area <0-4294967295> shortcut

— OSPF Command: area a.b.c.d stub
— OSPF Command: area <0-4294967295> stub
— OSPF Command: no area a.b.c.d stub
— OSPF Command: no area <0-4294967295> stub

— OSPF Command: area a.b.c.d stub no-summary
— OSPF Command: area <0-4294967295> stub no-summary
— OSPF Command: no area a.b.c.d stub no-summary
— OSPF Command: no area <0-4294967295> stub no-summary

— OSPF Command: area a.b.c.d default-cost <0-16777215>
— OSPF Command: no area a.b.c.d default-cost <0-16777215>

— OSPF Command: area a.b.c.d export-list NAME
— OSPF Command: area <0-4294967295> export-list NAME
— OSPF Command: no area a.b.c.d export-list NAME
— OSPF Command: no area <0-4294967295> export-list NAME

Filter Type-3 summary-LSAs announced to other areas originated from intra- area paths from specified area.
          router ospf
           network 192.168.1.0/24 area 0.0.0.0
           network 10.0.0.0/8 area 0.0.0.10
           area 0.0.0.10 export-list foo
          !
          access-list foo permit 10.10.0.0/16
          access-list foo deny any
     
With example above any intra-area paths from area 0.0.0.10 and from range 10.10.0.0/16 (for example 10.10.1.0/24 and 10.10.2.128/30) are announced into other areas as Type-3 summary-LSA's, but any others (for example 10.11.0.0/16 or 10.128.30.16/30) aren't. This command makes sense in ABR only.

— OSPF Command: area a.b.c.d import-list NAME
— OSPF Command: area <0-4294967295> import-list NAME
— OSPF Command: no area a.b.c.d import-list NAME
— OSPF Command: no area <0-4294967295> import-list NAME

Same as export-list, but it applies to paths announced into specified area as Type-3 summary-LSAs.

— OSPF Command: area a.b.c.d filter-list prefix NAME in
— OSPF Command: area a.b.c.d filter-list prefix NAME out
— OSPF Command: area <0-4294967295> filter-list prefix NAME in
— OSPF Command: area <0-4294967295> filter-list prefix NAME out
— OSPF Command: no area a.b.c.d filter-list prefix NAME in
— OSPF Command: no area a.b.c.d filter-list prefix NAME out
— OSPF Command: no area <0-4294967295> filter-list prefix NAME in
— OSPF Command: no area <0-4294967295> filter-list prefix NAME out

Filtering Type-3 summary-LSAs to/from area using prefix lists. This command makes sense in ABR only.

— OSPF Command: area a.b.c.d authentication
— OSPF Command: area <0-4294967295> authentication
— OSPF Command: no area a.b.c.d authentication
— OSPF Command: no area <0-4294967295> authentication

7.3 OSPF area