Administrator Guide

Area ID is the number or IP address assigned when creating the area.
To view which LSAs are transmitted, use the show ip ospf database process-id database-summary command in EXEC
Privilege mode.
Dell#show ip ospf 34 database database-summary
OSPF Router with ID (10.1.2.100) (Process ID 34)
Area ID Router Network S-Net S-ASBR Type-7 Subtotal
2.2.2.2 1 0 0 0 0 1
3.3.3.3 1 0 0 0 0 1
Dell#
To view information on areas, use the show ip ospf process-id command in EXEC Privilege mode.
Configuring LSA Throttling Timers
Configured link-state advertisement (LSA) timers replace the standard transmit and acceptance times for LSAs.
The LSA throttling timers are configured in milliseconds. The interval time increases exponentially until a maximum time is reached. If the
maximum time is reached, the system continues to transmit at the maximum interval. If the system is stable for twice the maximum
interval time, it reverts to the start-interval timer. The cycle repeats.
To configure the LSA throttling timers, use the following commands.
1. Specify the interval times for all LSA transmissions. CONFIG-ROUTER-OSPF-id mode. timers throttle lsa all {start-
interval | hold-interval | max-interval} To set the minimum interval between initial sending and resending the same LSA,
use the keywords start-interval. To set the next interval to send the same LSA, use the keywords hold-interval. The hold-
interval is the time between sending the same LSA after the start-interval is attempted. To set the maximum amount of time the
system waits before sending the LSA, use the keywords max-interval. The interval range is 0 to 600,000 milliseconds.
2. Specify the interval for LSA acceptance. CONFIG-ROUTER-OSPF-id mode. timers throttle lsa all arrival-time
Enabling Passive Interfaces
A passive interface is one that does not send or receive routing information.
Enabling passive interface suppresses routing updates on an interface. Although the passive interface does not send or receive routing
updates, the network on that interface is still included in OSPF updates sent via other interfaces.
To suppress the interface’s participation on an OSPF interface, use the following command. This command stops the router from sending
updates on that interface.
• Specify whether all or some of the interfaces are passive.
CONFIG-ROUTEROSPF- id mode
passive-interface {default | interface}
The default is enabled passive interfaces on ALL interfaces in the OSPF process.
Entering the physical interface type, slot, and number enables passive interface on only the identified interface.
• For a 10–Gigabit Ethernet interface, enter the keyword TenGigabitEthernet then the slot/port information (for example,
passive-interface te 2/1).
• For a 40-Gigabit Ethernet interface, enter the keyword FortyGigabitEthernet then the slot/port information (for example,
passive-interface fo 2/3).
• For a VLAN, enter the keyword vlan then a number from 1 to 4094 (for example, passive-interface vlan 2222).
The keyword default sets all interfaces on this OSPF process as passive.
To remove the passive interface from select interfaces, use the no passive-interface interface command while passive
interface default is configured.
To enable both receiving and sending routing updates, use the no passive-interface interface command.
When you configure a passive interface, the show ip ospf process-id interface command adds the words passive
interface to indicate that the hello packets are not transmitted on that interface (shown in bold).
Dell#show ip ospf 34 int
TengigabitEthernet 0/0 is up, line protocol is down
Internet Address 10.1.2.100/24, Area 1.1.1.1
Process ID 34, Router ID 10.1.2.100, Network Type BROADCAST, Cost: 10
618
Open Shortest Path First (OSPFv2 and OSPFv3)