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C H A P T E R 13 RIP and OSPF
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OSPF Database Overflow
The OSPF Database Overflow feature allows you to both limit the
size of the LSDB and maintain a consistent LSDB across all the
routers in the system.
Maintaining a consistent LSDB across all the routers in the domain
ensures that all routers have a consistent view of the network.
Maintain consistency by:
• Limiting the number of external LSAs in the database of each
router
• Ensuring that all routers have identical LSAs
Use this command to configure OSPF Database Overflow:
configure ospf ase-limit <number> {timeout
<seconds>}
The command allows two parameters:
• A limit specifying the number of external LSAs (excluding the
default LSAs) that the system will support before it goes into
overflow state. A limit value of 0 disables this functionality.
• The
timeout in seconds after which the system will come out of
overflow state. A timeout value of 0 leaves the system in overflow
state until OSPF is disabled and enabled.
When the LSDB size limit is reached, OSPF database overflow
flushes LSAs from the LSDB. OSPF database overflow flushes the
same LSAs from all the routers, thereby maintaining consistency.
OSPF Passive Interface
You can configure an OSPF interface as passive. Passive interfaces
do not send routing updates but do participate in receiving routing
updates.
To configure an OSPF interface as a passive interface:
configure ospf add vlan <vlan name> area <area
identifier> {passive}