Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 206)

178 Multi-Service IronWare Routing Configuration Guide
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Configuring OSPF
Rules for OSPF dead interval and hello interval timers
Beginning with version 03.2.00 of the Multi-Service IronWare software, the following rules apply
regarding these timers:
• If both the hello-interval and dead-interval parameters are configured, they will each be set to
the values that you have configured.
• If the hello-interval parameter is configured, but not the dead-interval parameter, the
dead-interval parameter will be set to a value that is 4 times the value set for the hello-interval.
• If the dead-interval parameter is configured, but not the hello-interval parameter, the
hello-interval. parameter will be set to a value that is 1/4 the value set for the dead-interval.
The minimum value for the hello-interval is 1.
Change the timer for OSPF authentication changes
When you make an OSPF authentication change, the software uses the authentication-change
timer to gracefully implement the change. The software implements the change in the following
ways:
• Outgoing OSPF packets – After you make the change, the software continues to use the old
authentication to send packets, during the remainder of the current authentication-change
interval. After this, the software uses the new authentication for sending packets.
• Inbound OSPF packets – The software accepts packets containing the new authentication and
continues to accept packets containing the older authentication for two authentication-change
intervals. After the second interval ends, the software accepts packets only if they contain the
new authentication key.
The default authentication-change interval is 300 seconds (5 minutes). You change the interval to
a value from 0 – 14400 seconds.
OSPF provides graceful authentication change for all the following types of authentication changes
in OSPF:
• Changing authentication methods from one of the following to another of the following:
active When you configure an OSPFv2 interface to be active, that interface sends
or receives all the control packets and forms the adjacency. By default, the
ip ospf active command is disabled. Whenever you configure the OSPF
interfaces to be passive using the default-passive-interface command, all
the OSPF interfaces stop sending and receiving control packets. To send
and receive packets over specific interfaces, you can use the ip ospf active
command.
priority Allows you to modify the priority of an OSPF router. The priority is used
when selecting the designated router (DR) and backup designated routers
(BDRs). The value can be from 0 – 255. The default is 1. If you set the
priority to 0, the device does not participate in DR and BDR election.
retransmit-interval The time between retransmissions of link-state advertisements (LSAs) to
adjacent routers for this interface. The value can be from 0 – 3600
seconds. The default is 5 seconds.
transit-delay The time it takes to transmit Link State Update packets on this interface.
The value can be from
0 – 3600 seconds. The default is 1 second.
Table 0.1: