Configure Stub Areas - Dell Force10 S4810P Configuration Manual

Configure stub areas

OSPF supports different types of LSAs to help reduce the amount of router processing within the areas.
Type 5 LSAs are not flooded into stub areas; the Area Border Router (ABR) advertises a default route into
the stub area to which it is attached. Stub area routers use the default route to reach external destinations.
To ensure connectivity in your OSPFv2 network, never configure the backbone area as a stub area.
Use these commands in the following sequence, starting in EXEC Privilege mode, to configure a stub area.
Step Command Syntax
1 show ip ospf process-id [ vrf
vrf name] database
database-summary
2
configure
3
router ospf
process-id
name}]
4
area stub
area-id
[ no-summary ]
Use the
show ip ospf database process-id database-summary
mode to view which LSAs are transmitted.
Command Example: show ip ospf process-id database database-summary
Figure 34-12.
FTOS#show ip ospf 34 database database-summary
OSPF Router with ID (10.1.2.100) (Process ID 34)
Area ID Router
2.2.2.2 1
3.3.3.3 1
FTOS#
To view information on areas, use the
Command Mode
EXEC Privilege
EXEC Privilege
CONFIGURATION
vrf
[ {vrf
CONFIG-ROUTER-O
SPF-id
Network S-Net S-ASBR
0 0 0
0 0 0
show ip ospf process-id
Usage
Review all areas after they were configured to
determine which areas are NOT receiving type 5
LSAs.
Show only the OSPF information tied to
:
vrf name
the VRF process.
Enter the CONFIGURATION mode.
Enter the ROUTER OSPF mode.
Process ID is the ID assigned when configuring
OSPFv2 globally.
vrf name: Enter the VRF keyword and instance
name to tie the OSPF instance to the VRF. All
network commands under this OSPF instance are
subsequently tied to the VRF instance.
Configure the area as a stub area. Use the
keywords to prevent transmission in
no-summary
to the area of summary ASBR LSAs.
Area ID is the number or IP address assigned when
creating the Area.
command syntax in the EXEC Privilege
Type-7 Subtotal
0 1
0 1
command in the EXEC Privilege mode.
Open Shortest Path First (OSPFv2 and OSPFv3) | 741