Edge-Core ECS4660-28F Management Manual page 803

Configuring the Open Shortest Path First Protocol (Version 2)
A stub can have multiple ABRs or exit points. However, all of the exit
◆
points and local routers must contain the same external routing data so
that the exit point does not need to be determined for each external
destination.
P
ARAMETERS
These parameters are displayed:
◆ Process ID – Process ID as configured in the Network Area
configuration screen (see
Area ID – Identifier for a stub.
◆
Default Cost – Cost for the default summary route sent into a stub
◆
from an area border router (ABR). (Range: 0-16777215; Default: 0)
Note that he the default cost is set to "0," the router will not advertise a
default route into the attached stub.
Summary – Controls the use of summary routes.
◆
Summary – Allows an Area Border Router (ABR) to send a
■
summary link advertisement into the stub area.
No Summary – Stops an ABR from sending a summary link
■
advertisement into a stub area.
Routing table space is saved in a stub by blocking Type-4 AS
summary LSAs and Type 5 external LSAs. This option can be used
to completely isolate the stub by also stopping an ABR from sending
Type-3 summary LSAs that advertise the default route for
destinations external to the local area or the autonomous system.
Define an area as a totally stubby area only if routers in the area do
not require summary LSAs from other areas.
W I
EB NTERFACE
To configure protocol settings for a stub:
Click Routing Protocol, OSPF, Area.
1.
Select Configure Area from the Step list.
2.
Select Configure Stub Area from the Action list.
3.
Select a Process ID, and modify the routing behavior for a stub.
4.
Click Apply
5.
– 803 –
C
HAPTER
page 790).
| Unicast Routing
20