Owner's Manual

Chapter 24. OSPF | 675
NETGEAR 8800 User Manual
Database Overflow
The OSPF database overflow feature allows you to limit the size of the LSDB and to maintain
a consistent LSDB across all the routers in the domain, which ensures that all routers have a
consistent view of the network.
Consistency is achieved by:
• Limiting the number of external LSAs in the database of each router
• Ensuring that all routers have identical LSAs
To configure OSPF database overflow, use the following command:
configure ospf ase-limit <number> {timeout <seconds>}
Where:
• <number>—Specifies the number of external LSAs that the system supports before it goes
into overflow state. A limit value of 0 disables the functionality.
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, which
maintains consistency.
• timeout—Specifies the timeout, in seconds, after which the system ceases to be in
overflow state. A timeout value of 0 leaves the system in overflow state until OSPF is
disabled and re-enabled.
Opaque LSAs
Opaque LSAs are a generic OSPF mechanism used to carry auxiliary information in the
OSPF database. Opaque LSAs are most commonly used to support OSPF traffic
engineering.
Table 67. LSA Type Numbers
Type Number Description
1 Router LSA
2 Network LSA
3 Summary LSA
4 AS summary LSA
5 AS external LSA
7 NSSA external LSA
9 Link local—Opaque
10 Area scoping—Opaque
11 AS scoping—Opaque