internal router

An internal router has all its interfaces in a single area.

This problem is further compounded by limits caused by internal router bandwidth.

This reduces LSDB and routing table size for internal routers.

Internal router (IR)

In this example, none of the internal routers know the route to that host, so they will forward the packet through router1's gateway or default route.

An internal router is a router that has OSPF neighbor relationships with interfaces in the same area.

Unlike public Internet routers that need additional configuration to forward these packets, internal routers do not need any additional configuration to forward these packets.

An ABR deletes type 4, 5 LSAs from internal routers, sends them a default route of 0.0.0.0 and turns itself into a default gateway.

Backbone routers are all routers that are connected to the OSPF backbone, irrespective of whether they are also area border routers or internal routers of the backbone area.

Wireless routers integrate a Wireless Access Point, Ethernet switch, and internal router firmware application that provides IP routing, NAT, and DNS forwarding through an integrated WAN-interface.