Configure Stub Areas - Dell Force10 C150 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
show ip ospf process-id [ vrf
1
vrf name] database
database-summary
configure
2
router ospf
3 process-id
name}]
area stub
4
area-id
[ no-summary ]
show ip ospf database process-id database-summary
Use the
EXEC Privilege mode To view which LSAs are transmitted.
Figure 32-12. Command Example: show ip ospf process-id database database-summary
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
vrf
[ {vrf
CONFIGURATION
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.
vrf name
: Show only the OSPF information tied to the
VRF process.
Enter the CONFIGURATION mode.
Enter the ROUTER OSPF mode.
Process ID is the ID assigned when configuring
OSPFv2 globally (page
vrf name:
Enter the VRF key word 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
no-summary keywords to prevent transmission in
to the area of summary ASBR LSAs.
Area ID is the number or IP address assigned when
creating the Area (page
command syntax
Type-7 Subtotal
0 1
0 1
command in the EXEC Privilege mode.
Open Shortest Path First (OSPFv2 and OSPFv3) | 711
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