Black Box LRU4240 manual Related Commands ip ospf dead-interval, Ip ospf hello-interval

Dual Trunk E1 Router

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

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