Configuring Ospf - Nokia Voyager Reference Manual

6
Configuring Routing
Alternate Area Border Router Behavior
Nokia supports the implementation of Area Border Router (ABR) behavior as
outlined in the internet draft of the Internet Engineering Task Force (IETF).
The definition of an ABR in the OSPF specification as outlined in RFC 2026
does not require a router with mutiple attached areas to have a backbone
connection. However, under this definition, any traffic destined for areas that
are not connected to an ABR or that are outside the OSPF domain is dropped.
According the internet draft, a router is considered to be an ABR if it has more
than one area actively attached and one of them is the backbone area. An area
is considered actively attached if the router has at least one interface in that
area that is not down.
Rather than redefine an ABR, the the Nokia implementation includes in its
routing calculation summary
ABR does not have an active backbone connection, means that the backbone
is activley attached and includes at least one fully adjacent neighbor.
You do not need to configure this feature. It functions automatically under
certain topographies.

Configuring OSPF

1. Complete
2. Assign an IP address to the interface.
3. Click C
4. Click the OSPF link in the Routing Configuration section.
5. (Optional) This step is encouraged so the id is not tied to an address. Enter
the router ID in the R
6. (Optional) If you have new OSPF areas to enter:
a. Enter the new OSPF area name in the A
226
"Configuring an Ethernet Interface"
on the home page.
ONFIG
OUTER
box; then click A
PPLY
Repeat this step for each new area. Area 0.0.0.0 is already defined as
the backbone area.
LSAs from all actively attached areas if the
ID edit box.
DD
.
for the interface.
N OSPF A
edit
EW REA
Voyager Reference Guide