Black Box LRU4240 - Manual (Page 185)

Dual Trunk E1 Router
Dual Trunk E1 Router User’s Guide TECHNICAL: 0118 96 56 000 173
OSPF floods new LSAs over all interfaces in an area, except the interface on which the LSA arrives. This redundancy
ensures robust flooding. However, too much redundancy can waste bandwidth and might lead to excessive link and CPU
usage in certain topologies, resulting in destabilizing the network. To avoid this, use the database-filter command to block
flooding of LSAs over specified interfaces.
Examples
ospfd# configure terminal
ospfd(config)# interface eth0
ospfd(config-if)# ip ospf database-filter all out
Related Commands
ip ospf dead-interval
Use the ip ospf dead-interval command to set the interval during which no hello packets are received and after
which a neighbor is declared dead.
Use the no form of this command to return to the default time.
Command Syntax
ip ospf dead-interval INTERVAL (A.B.C.D)
no ip ospf dead-interval (A.B.C.D)
INTERVAL= <1-65535> Specifies the interval in seconds. The default interval is 40 seconds.
Command Mode
Interface mode
Usage
The dead-interval is the amount of time that the router waits to receive an OSPF hello packet from the neighbor before declaring
the neighbor down. This value is advertised in the router's hello packets. It must be a multiple of hello-interval and be the same
for all routers on a specific network.
Examples
The following example shows configuring dead-interval for 10 seconds on fxp0 interface for IP address 10.10.10.50.
ospfd# configure terminal
ospfd(config)# interface fxp0
ospfd(config-if)# ip ospf dead-interval 10 10.10.10.50
Related Commands
ip ospf hello-interval, show ip ospf interface
Equivalent Commands
ospf dead-interval
ip ospf hello-interval
Use the ip ospf hello-interval command to specify the interval between hello packets.
Use the no form of this command to return to the default time.
Command Syntax
ip ospf hello-interval INTERVAL (A.B.C.D)
no ip ospf hello-interval (A.B.C.D)
INTERVAL= <1-65535> Specifies the interval in seconds. The default interval is 10 seconds.
A.B.C.D = IP address of the interface.
Command Mode
Interface mode
Usage
The hello-interval is advertised in the hello packets. Configure the same hello-interval for all routers on a specific network.
A shorter hello interval ensures faster detection of topological changes but results in more routing traffic.
Examples
The following example shows setting the hello-interval for 3 seconds on interface fxp0 for IP address 10.10.10.50.
ospfd# configure terminal
ospfd(config)# interface fxp0
ospfd(config-if)# ip ospf hello-interval 3 10.10.10.50
Related Commands