- Planet WAN Router User's Manual

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information between non-backbone areas
Stub area – this area do not accept router that belong to external autonomous system (AS).
The routers in stub area use a default route to reach outside autonomous system.
Totally stubby area – This area that does not accept routes from other intra-area and default
routes to be propagated within the area. If the router needs to send a packet to outside of area,
it sends it using a default route.
Not-so-stubby-area – this area allows limited number of external routes that imports into
area.
Types of routers
Internal router – routers that directly connected to the networks belong to the same area.
Backbone router – The router that connect with other Autonomous system bye physical or
victual link.
Area border router (ABR) – A router that attached to multiple areas. ABR routers maintain the
separate database for each area that connects with. Then ABR condense the topological
information for their attached area and distribute to the backbone area.
Autonomous System Boundary router (ASBR) – This router have at least one interface
connect to another autonomous system.
Types of OSPF Network Topologies
Point-to-point – Two routers that directly connect each other by serial interface.
Broadcast multiaccess – Network that connects more then two routers together with
broadcast capability. Such as Ethernet is a broadcast multiaccess.
Nonbroadcast multiaccess (NBMA) – Network support many routers but having no
broadcast capability.
4.3.1 OSPF Command
router ospf <ospf ID> - enable OSPF in global configuration mode.
Network area - address wildcard-mask area area-id
Neighbor [poll-interval | priority] - Specify a neighbor router. For point-to-Multipoint and
NBMA networks, neighbor must be configured. Poll-interval is for ospf dead-router polling
interval. Priority is for ospf priority of non-broadcast neighbor.
Area – OSPF area parameters